org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/correction/QuickAssistProcessor.java

/*******************************************************************************
 * Copyright (c) 2000, 2011 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Sebastian Davids <sdavids@gmx.de> - Bug 37432 getInvertEqualsProposal
 *     Benjamin Muskalla <b.muskalla@gmx.net> - Bug 36350 convertToStringBufferPropsal
 *     Chris West (Faux) <eclipse@goeswhere.com> - [quick assist] "Use 'StringBuilder' for string concatenation" could fix existing misuses - https://bugs.eclipse.org/bugs/show_bug.cgi?id=282755
 *******************************************************************************/
package org.eclipse.jdt.internal.ui.text.correction;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.eclipse.swt.graphics.Image;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;

import org.eclipse.core.resources.IFile;

import org.eclipse.text.edits.InsertEdit;

import org.eclipse.ui.IEditorPart;

import org.eclipse.ltk.core.refactoring.Refactoring;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.ltk.core.refactoring.TextChange;
import org.eclipse.ltk.core.refactoring.TextFileChange;

import org.eclipse.jdt.core.Flags;
import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaModelMarker;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.NamingConventions;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.AnonymousClassDeclaration;
import org.eclipse.jdt.core.dom.ArrayCreation;
import org.eclipse.jdt.core.dom.ArrayInitializer;
import org.eclipse.jdt.core.dom.ArrayType;
import org.eclipse.jdt.core.dom.Assignment;
import org.eclipse.jdt.core.dom.Block;
import org.eclipse.jdt.core.dom.BodyDeclaration;
import org.eclipse.jdt.core.dom.CastExpression;
import org.eclipse.jdt.core.dom.CatchClause;
import org.eclipse.jdt.core.dom.ChildListPropertyDescriptor;
import org.eclipse.jdt.core.dom.ClassInstanceCreation;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.ConditionalExpression;
import org.eclipse.jdt.core.dom.DoStatement;
import org.eclipse.jdt.core.dom.EnhancedForStatement;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jdt.core.dom.ExpressionStatement;
import org.eclipse.jdt.core.dom.ForStatement;
import org.eclipse.jdt.core.dom.IBinding;
import org.eclipse.jdt.core.dom.IMethodBinding;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.IVariableBinding;
import org.eclipse.jdt.core.dom.IfStatement;
import org.eclipse.jdt.core.dom.InfixExpression;
import org.eclipse.jdt.core.dom.Initializer;
import org.eclipse.jdt.core.dom.LabeledStatement;
import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jdt.core.dom.MethodInvocation;
import org.eclipse.jdt.core.dom.Modifier;
import org.eclipse.jdt.core.dom.Name;
import org.eclipse.jdt.core.dom.ParameterizedType;
import org.eclipse.jdt.core.dom.ParenthesizedExpression;
import org.eclipse.jdt.core.dom.PrimitiveType;
import org.eclipse.jdt.core.dom.SimpleName;
import org.eclipse.jdt.core.dom.SimpleType;
import org.eclipse.jdt.core.dom.SingleVariableDeclaration;
import org.eclipse.jdt.core.dom.Statement;
import org.eclipse.jdt.core.dom.StringLiteral;
import org.eclipse.jdt.core.dom.StructuralPropertyDescriptor;
import org.eclipse.jdt.core.dom.SwitchCase;
import org.eclipse.jdt.core.dom.SwitchStatement;
import org.eclipse.jdt.core.dom.SynchronizedStatement;
import org.eclipse.jdt.core.dom.ThisExpression;
import org.eclipse.jdt.core.dom.TryStatement;
import org.eclipse.jdt.core.dom.Type;
import org.eclipse.jdt.core.dom.TypeDeclaration;
import org.eclipse.jdt.core.dom.UnionType;
import org.eclipse.jdt.core.dom.VariableDeclaration;
import org.eclipse.jdt.core.dom.VariableDeclarationExpression;
import org.eclipse.jdt.core.dom.VariableDeclarationFragment;
import org.eclipse.jdt.core.dom.VariableDeclarationStatement;
import org.eclipse.jdt.core.dom.WhileStatement;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.jdt.core.dom.rewrite.ImportRewrite;
import org.eclipse.jdt.core.dom.rewrite.ImportRewrite.ImportRewriteContext;
import org.eclipse.jdt.core.dom.rewrite.ListRewrite;

import org.eclipse.jdt.internal.corext.codemanipulation.ContextSensitiveImportRewriteContext;
import org.eclipse.jdt.internal.corext.codemanipulation.StubUtility;
import org.eclipse.jdt.internal.corext.dom.ASTNodeFactory;
import org.eclipse.jdt.internal.corext.dom.ASTNodes;
import org.eclipse.jdt.internal.corext.dom.Bindings;
import org.eclipse.jdt.internal.corext.dom.LinkedNodeFinder;
import org.eclipse.jdt.internal.corext.dom.Selection;
import org.eclipse.jdt.internal.corext.dom.SelectionAnalyzer;
import org.eclipse.jdt.internal.corext.dom.TokenScanner;
import org.eclipse.jdt.internal.corext.fix.CleanUpConstants;
import org.eclipse.jdt.internal.corext.fix.ControlStatementsFix;
import org.eclipse.jdt.internal.corext.fix.ConvertLoopFix;
import org.eclipse.jdt.internal.corext.fix.IProposableFix;
import org.eclipse.jdt.internal.corext.fix.LinkedProposalModel;
import org.eclipse.jdt.internal.corext.fix.VariableDeclarationFix;
import org.eclipse.jdt.internal.corext.refactoring.RefactoringAvailabilityTester;
import org.eclipse.jdt.internal.corext.refactoring.code.ConvertAnonymousToNestedRefactoring;
import org.eclipse.jdt.internal.corext.refactoring.code.ExtractConstantRefactoring;
import org.eclipse.jdt.internal.corext.refactoring.code.ExtractMethodRefactoring;
import org.eclipse.jdt.internal.corext.refactoring.code.ExtractTempRefactoring;
import org.eclipse.jdt.internal.corext.refactoring.code.InlineTempRefactoring;
import org.eclipse.jdt.internal.corext.refactoring.code.PromoteTempToFieldRefactoring;
import org.eclipse.jdt.internal.corext.refactoring.util.TightSourceRangeComputer;
import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
import org.eclipse.jdt.internal.corext.util.Messages;

import org.eclipse.jdt.ui.cleanup.CleanUpOptions;
import org.eclipse.jdt.ui.cleanup.ICleanUp;
import org.eclipse.jdt.ui.text.java.IInvocationContext;
import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal;
import org.eclipse.jdt.ui.text.java.IProblemLocation;
import org.eclipse.jdt.ui.text.java.IQuickAssistProcessor;

import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.JavaPluginImages;
import org.eclipse.jdt.internal.ui.fix.ControlStatementsCleanUp;
import org.eclipse.jdt.internal.ui.fix.ConvertLoopCleanUp;
import org.eclipse.jdt.internal.ui.fix.VariableDeclarationCleanUp;
import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
import org.eclipse.jdt.internal.ui.text.correction.proposals.ASTRewriteCorrectionProposal;
import org.eclipse.jdt.internal.ui.text.correction.proposals.AssignToVariableAssistProposal;
import org.eclipse.jdt.internal.ui.text.correction.proposals.CUCorrectionProposal;
import org.eclipse.jdt.internal.ui.text.correction.proposals.ChangeCorrectionProposal;
import org.eclipse.jdt.internal.ui.text.correction.proposals.FixCorrectionProposal;
import org.eclipse.jdt.internal.ui.text.correction.proposals.LinkedCorrectionProposal;
import org.eclipse.jdt.internal.ui.text.correction.proposals.LinkedNamesAssistProposal;
import org.eclipse.jdt.internal.ui.text.correction.proposals.NewDefiningMethodProposal;
import org.eclipse.jdt.internal.ui.text.correction.proposals.RenameRefactoringProposal;
import org.eclipse.jdt.internal.ui.viewsupport.BasicElementLabels;
import org.eclipse.jdt.internal.ui.viewsupport.JavaElementImageProvider;

/**
  */
public class QuickAssistProcessor implements IQuickAssistProcessor {

	public static final String SPLIT_JOIN_VARIABLE_DECLARATION_ID= "org.eclipse.jdt.ui.correction.splitJoinVariableDeclaration.assist"; //$NON-NLS-1$
	public static final String CONVERT_FOR_LOOP_ID= "org.eclipse.jdt.ui.correction.convertForLoop.assist"; //$NON-NLS-1$
	public static final String ASSIGN_TO_LOCAL_ID= "org.eclipse.jdt.ui.correction.assignToLocal.assist"; //$NON-NLS-1$
	public static final String ASSIGN_TO_FIELD_ID= "org.eclipse.jdt.ui.correction.assignToField.assist"; //$NON-NLS-1$
	public static final String ASSIGN_PARAM_TO_FIELD_ID= "org.eclipse.jdt.ui.correction.assignParamToField.assist"; //$NON-NLS-1$
	public static final String ADD_BLOCK_ID= "org.eclipse.jdt.ui.correction.addBlock.assist"; //$NON-NLS-1$
	public static final String EXTRACT_LOCAL_ID= "org.eclipse.jdt.ui.correction.extractLocal.assist"; //$NON-NLS-1$
	public static final String EXTRACT_LOCAL_NOT_REPLACE_ID= "org.eclipse.jdt.ui.correction.extractLocalNotReplaceOccurrences.assist"; //$NON-NLS-1$
	public static final String EXTRACT_CONSTANT_ID= "org.eclipse.jdt.ui.correction.extractConstant.assist"; //$NON-NLS-1$
	public static final String INLINE_LOCAL_ID= "org.eclipse.jdt.ui.correction.inlineLocal.assist"; //$NON-NLS-1$
	public static final String CONVERT_LOCAL_TO_FIELD_ID= "org.eclipse.jdt.ui.correction.convertLocalToField.assist"; //$NON-NLS-1$
	public static final String CONVERT_ANONYMOUS_TO_LOCAL_ID= "org.eclipse.jdt.ui.correction.convertAnonymousToLocal.assist"; //$NON-NLS-1$
	public static final String CONVERT_TO_STRING_BUFFER_ID= "org.eclipse.jdt.ui.correction.convertToStringBuffer.assist"; //$NON-NLS-1$
	public static final String CONVERT_TO_MESSAGE_FORMAT_ID= "org.eclipse.jdt.ui.correction.convertToMessageFormat.assist"; //$NON-NLS-1$;

	public QuickAssistProcessor() {
		super();
	}

	public boolean hasAssists(IInvocationContext context) throws CoreException {
		ASTNode coveringNode= context.getCoveringNode();
		if (coveringNode != null) {
			ArrayList<ASTNode> coveredNodes= AdvancedQuickAssistProcessor.getFullyCoveredNodes(context, coveringNode);
			return getCatchClauseToThrowsProposals(context, coveringNode, null)
				|| getPickoutTypeFromMulticatchProposals(context, coveringNode, coveredNodes, null)
				|| getConvertToMultiCatchProposals(context, coveringNode, null)
				|| getUnrollMultiCatchProposals(context, coveringNode, null)
				|| getRenameLocalProposals(context, coveringNode, null, null)
				|| getRenameRefactoringProposal(context, coveringNode, null, null)
				|| getAssignToVariableProposals(context, coveringNode, null, null)
				|| getUnWrapProposals(context, coveringNode, null)
				|| getAssignParamToFieldProposals(context, coveringNode, null)
				|| getJoinVariableProposals(context, coveringNode, null)
				|| getAddFinallyProposals(context, coveringNode, null)
				|| getAddElseProposals(context, coveringNode, null)
				|| getSplitVariableProposals(context, coveringNode, null)
				|| getAddBlockProposals(context, coveringNode, null)
				|| getArrayInitializerToArrayCreation(context, coveringNode, null)
				|| getCreateInSuperClassProposals(context, coveringNode, null)
				|| getInvertEqualsProposal(context, coveringNode, null)
				|| getConvertForLoopProposal(context, coveringNode, null)
				|| getExtractVariableProposal(context, false, null)
				|| getExtractMethodProposal(context, coveringNode, false, null)
				|| getInlineLocalProposal(context, coveringNode, null)
				|| getConvertLocalToFieldProposal(context, coveringNode, null)
				|| getConvertAnonymousToNestedProposal(context, coveringNode, null)
				|| getConvertIterableLoopProposal(context, coveringNode, null)
				|| getRemoveBlockProposals(context, coveringNode, null)
				|| getMakeVariableDeclarationFinalProposals(context, null)
				|| getMissingCaseStatementProposals(context, coveringNode, null)
				|| getConvertStringConcatenationProposals(context, null)
				|| getInferDiamondArgumentsProposal(context, coveringNode, null, null);
		}
		return false;
	}

	public IJavaCompletionProposal[] getAssists(IInvocationContext context, IProblemLocation[] locations) throws CoreException {
		ASTNode coveringNode= context.getCoveringNode();
		if (coveringNode != null) {
			ArrayList<ASTNode> coveredNodes= AdvancedQuickAssistProcessor.getFullyCoveredNodes(context, coveringNode);
			ArrayList<ICommandAccess> resultingCollections= new ArrayList<ICommandAccess>();
			boolean noErrorsAtLocation= noErrorsAtLocation(locations);

			// quick assists that show up also if there is an error/warning
			getRenameLocalProposals(context, coveringNode, locations, resultingCollections);
			getRenameRefactoringProposal(context, coveringNode, locations, resultingCollections);
			getAssignToVariableProposals(context, coveringNode, locations, resultingCollections);
			getAssignParamToFieldProposals(context, coveringNode, resultingCollections);
			getInferDiamondArgumentsProposal(context, coveringNode, locations, resultingCollections);

			if (noErrorsAtLocation) {
				boolean problemsAtLocation= locations.length != 0;
				getCatchClauseToThrowsProposals(context, coveringNode, resultingCollections);
				getPickoutTypeFromMulticatchProposals(context, coveringNode, coveredNodes, resultingCollections);
				getConvertToMultiCatchProposals(context, coveringNode, resultingCollections);
				getUnrollMultiCatchProposals(context, coveringNode, resultingCollections);
				getUnWrapProposals(context, coveringNode, resultingCollections);
				getJoinVariableProposals(context, coveringNode, resultingCollections);
				getSplitVariableProposals(context, coveringNode, resultingCollections);
				getAddFinallyProposals(context, coveringNode, resultingCollections);
				getAddElseProposals(context, coveringNode, resultingCollections);
				getAddBlockProposals(context, coveringNode, resultingCollections);
				getInvertEqualsProposal(context, coveringNode, resultingCollections);
				getArrayInitializerToArrayCreation(context, coveringNode, resultingCollections);
				getCreateInSuperClassProposals(context, coveringNode, resultingCollections);
				getExtractVariableProposal(context, problemsAtLocation, resultingCollections);
				getExtractMethodProposal(context, coveringNode, problemsAtLocation, resultingCollections);
				getInlineLocalProposal(context, coveringNode, resultingCollections);
				getConvertLocalToFieldProposal(context, coveringNode, resultingCollections);
				getConvertAnonymousToNestedProposal(context, coveringNode, resultingCollections);
				if (!getConvertForLoopProposal(context, coveringNode, resultingCollections))
					getConvertIterableLoopProposal(context, coveringNode, resultingCollections);
				getRemoveBlockProposals(context, coveringNode, resultingCollections);
				getMakeVariableDeclarationFinalProposals(context, resultingCollections);
				getConvertStringConcatenationProposals(context, resultingCollections);
				getMissingCaseStatementProposals(context, coveringNode, resultingCollections);
			}
			return resultingCollections.toArray(new IJavaCompletionProposal[resultingCollections.size()]);
		}
		return null;
	}

	static boolean noErrorsAtLocation(IProblemLocation[] locations) {
		if (locations != null) {
			for (int i= 0; i < locations.length; i++) {
				IProblemLocation location= locations[i];
				if (location.isError()) {
					if (IJavaModelMarker.JAVA_MODEL_PROBLEM_MARKER.equals(location.getMarkerType())
							&& JavaCore.getOptionForConfigurableSeverity(location.getProblemId()) != null) {
						// continue (only drop out for severe (non-optional) errors)
					} else {
						return false;
					}
				}
			}
		}
		return true;
	}

	private static int getIndex(int offset, List<Statement> statements) {
		for (int i= 0; i < statements.size(); i++) {
			Statement s= statements.get(i);
			if (offset < s.getStartPosition()) {
				return i;
			}
			if (offset < s.getStartPosition() + s.getLength()) {
				return -1;
			}
		}
		return statements.size();
	}

	private static boolean getExtractMethodProposal(IInvocationContext context, ASTNode coveringNode, boolean problemsAtLocation, Collection<ICommandAccess> proposals) throws CoreException {
		if (!(coveringNode instanceof Expression) && !(coveringNode instanceof Statement) && !(coveringNode instanceof Block)) {
			return false;
		}
		if (coveringNode instanceof Block) {
			List<Statement> statements= ((Block) coveringNode).statements();
			int startIndex= getIndex(context.getSelectionOffset(), statements);
			if (startIndex == -1)
				return false;
			int endIndex= getIndex(context.getSelectionOffset() + context.getSelectionLength(), statements);
			if (endIndex == -1 || endIndex <= startIndex)
				return false;
		}

		if (proposals == null) {
			return true;
		}

		final ICompilationUnit cu= context.getCompilationUnit();
		final ExtractMethodRefactoring extractMethodRefactoring= new ExtractMethodRefactoring(context.getASTRoot(), context.getSelectionOffset(), context.getSelectionLength());
		extractMethodRefactoring.setMethodName("extracted"); //$NON-NLS-1$
		if (extractMethodRefactoring.checkInitialConditions(new NullProgressMonitor()).isOK()) {
			String label= CorrectionMessages.QuickAssistProcessor_extractmethod_description;
			LinkedProposalModel linkedProposalModel= new LinkedProposalModel();
			extractMethodRefactoring.setLinkedProposalModel(linkedProposalModel);

			Image image= JavaPluginImages.get(JavaPluginImages.IMG_MISC_PUBLIC);
			int relevance= problemsAtLocation ? 1 : 4;
			RefactoringCorrectionProposal proposal= new RefactoringCorrectionProposal(label, cu, extractMethodRefactoring, relevance, image);
			proposal.setLinkedProposalModel(linkedProposalModel);
			proposals.add(proposal);
		}
		return true;
	}



	private static boolean getExtractVariableProposal(IInvocationContext context, boolean problemsAtLocation, Collection<ICommandAccess> proposals) throws CoreException {
		
		ASTNode node= context.getCoveredNode();

		if (!(node instanceof Expression)) {
			if (context.getSelectionLength() != 0) {
				return false;
			}
			node= context.getCoveringNode();
			if (!(node instanceof Expression)) {
				return false;
			}
		}
		final Expression expression= (Expression) node;

		ITypeBinding binding= expression.resolveTypeBinding();
		if (binding == null || Bindings.isVoidType(binding)) {
			return false;
		}
		if (proposals == null) {
			return true;
		}

		int relevanceDrop;
		if (context.getSelectionLength() == 0) {
			relevanceDrop= 6;
		} else if (problemsAtLocation) {
			relevanceDrop= 3;
		} else {
			relevanceDrop= 0;
		}

		final ICompilationUnit cu= context.getCompilationUnit();
		ExtractTempRefactoring extractTempRefactoring= new ExtractTempRefactoring(context.getASTRoot(), expression.getStartPosition(), expression.getLength());
		if (extractTempRefactoring.checkInitialConditions(new NullProgressMonitor()).isOK()) {
			LinkedProposalModel linkedProposalModel= new LinkedProposalModel();
			extractTempRefactoring.setLinkedProposalModel(linkedProposalModel);
			extractTempRefactoring.setCheckResultForCompileProblems(false);

			String label= CorrectionMessages.QuickAssistProcessor_extract_to_local_all_description;
			Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_LOCAL);
			RefactoringCorrectionProposal proposal= new RefactoringCorrectionProposal(label, cu, extractTempRefactoring, 6 - relevanceDrop, image) {
				@Override
				protected void init(Refactoring refactoring) throws CoreException {
					ExtractTempRefactoring etr= (ExtractTempRefactoring) refactoring;
					etr.setTempName(etr.guessTempName()); // expensive
				}
			};
			proposal.setCommandId(EXTRACT_LOCAL_ID);
			proposal.setLinkedProposalModel(linkedProposalModel);
			proposals.add(proposal);
		}

		ExtractTempRefactoring extractTempRefactoringSelectedOnly= new ExtractTempRefactoring(context.getASTRoot(), expression.getStartPosition(), expression.getLength());
		extractTempRefactoringSelectedOnly.setReplaceAllOccurrences(false);
		if (extractTempRefactoringSelectedOnly.checkInitialConditions(new NullProgressMonitor()).isOK()) {
			LinkedProposalModel linkedProposalModel= new LinkedProposalModel();
			extractTempRefactoringSelectedOnly.setLinkedProposalModel(linkedProposalModel);
			extractTempRefactoringSelectedOnly.setCheckResultForCompileProblems(false);

			String label= CorrectionMessages.QuickAssistProcessor_extract_to_local_description;
			Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_LOCAL);
			RefactoringCorrectionProposal proposal= new RefactoringCorrectionProposal(label, cu, extractTempRefactoringSelectedOnly, 5 - relevanceDrop, image) {
				@Override
				protected void init(Refactoring refactoring) throws CoreException {
					ExtractTempRefactoring etr= (ExtractTempRefactoring) refactoring;
					etr.setTempName(etr.guessTempName()); // expensive
				}
			};
			proposal.setCommandId(EXTRACT_LOCAL_NOT_REPLACE_ID);
			proposal.setLinkedProposalModel(linkedProposalModel);
			proposals.add(proposal);
		}

		ExtractConstantRefactoring extractConstRefactoring= new ExtractConstantRefactoring(context.getASTRoot(), expression.getStartPosition(), expression.getLength());
		if (extractConstRefactoring.checkInitialConditions(new NullProgressMonitor()).isOK()) {
			LinkedProposalModel linkedProposalModel= new LinkedProposalModel();
			extractConstRefactoring.setLinkedProposalModel(linkedProposalModel);
			extractConstRefactoring.setCheckResultForCompileProblems(false);

			String label= CorrectionMessages.QuickAssistProcessor_extract_to_constant_description;
			Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_LOCAL);
			RefactoringCorrectionProposal proposal= new RefactoringCorrectionProposal(label, cu, extractConstRefactoring, 4 - relevanceDrop, image) {
				@Override
				protected void init(Refactoring refactoring) throws CoreException {
					ExtractConstantRefactoring etr= (ExtractConstantRefactoring) refactoring;
					etr.setConstantName(etr.guessConstantName()); // expensive
				}
			};
			proposal.setCommandId(EXTRACT_CONSTANT_ID);
			proposal.setLinkedProposalModel(linkedProposalModel);
			proposals.add(proposal);
		}
		return false;
	}


	private static boolean getConvertAnonymousToNestedProposal(IInvocationContext context, final ASTNode node, Collection<ICommandAccess> proposals) throws CoreException {
		if (!(node instanceof Name))
			return false;

		ASTNode normalized= ASTNodes.getNormalizedNode(node);
		if (normalized.getLocationInParent() != ClassInstanceCreation.TYPE_PROPERTY)
			return false;

		final AnonymousClassDeclaration anonymTypeDecl= ((ClassInstanceCreation) normalized.getParent()).getAnonymousClassDeclaration();
		if (anonymTypeDecl == null || anonymTypeDecl.resolveBinding() == null) {
			return false;
		}

		if (proposals == null) {
			return true;
		}

		final ICompilationUnit cu= context.getCompilationUnit();
		final ConvertAnonymousToNestedRefactoring refactoring= new ConvertAnonymousToNestedRefactoring(anonymTypeDecl);
		
		String extTypeName= ASTNodes.getSimpleNameIdentifier((Name) node);
		ITypeBinding anonymTypeBinding= anonymTypeDecl.resolveBinding();
		String className;
		if (anonymTypeBinding.getInterfaces().length == 0) {
			className= Messages.format(CorrectionMessages.QuickAssistProcessor_name_extension_from_interface, extTypeName);
		} else {
			className= Messages.format(CorrectionMessages.QuickAssistProcessor_name_extension_from_class, extTypeName);
		}
		String[][] existingTypes= ((IType) anonymTypeBinding.getJavaElement()).resolveType(className);
		int i= 1;
		while (existingTypes != null) {
			i++;
			existingTypes= ((IType) anonymTypeBinding.getJavaElement()).resolveType(className + i);
		}
		refactoring.setClassName(i == 1 ? className : className + i);

		if (refactoring.checkInitialConditions(new NullProgressMonitor()).isOK()) {
			LinkedProposalModel linkedProposalModel= new LinkedProposalModel();
			refactoring.setLinkedProposalModel(linkedProposalModel);

			String label= CorrectionMessages.QuickAssistProcessor_convert_anonym_to_nested;
			Image image= JavaPlugin.getImageDescriptorRegistry().get(JavaElementImageProvider.getTypeImageDescriptor(true, false, Flags.AccPrivate, false));
			RefactoringCorrectionProposal proposal= new RefactoringCorrectionProposal(label, cu, refactoring, 5, image);
			proposal.setLinkedProposalModel(linkedProposalModel);
			proposal.setCommandId(CONVERT_ANONYMOUS_TO_LOCAL_ID);
			proposals.add(proposal);
		}
		return false;
	}

	public static boolean getInferDiamondArgumentsProposal(IInvocationContext context, ASTNode node, IProblemLocation[] locations, Collection<ICommandAccess> resultingCollections) {
		ParameterizedType createdType= null;
		
		if (node instanceof Name) {
			Name name= ASTNodes.getTopMostName((Name) node);
			if (name.getLocationInParent() == SimpleType.NAME_PROPERTY) {
				SimpleType type= (SimpleType) name.getParent();
				if (type.getLocationInParent() == ParameterizedType.TYPE_PROPERTY) {
					createdType= (ParameterizedType) type.getParent();
					if (createdType.getLocationInParent() != ClassInstanceCreation.TYPE_PROPERTY) {
						return false;
					}
				}
			}
		} else if (node instanceof ParameterizedType) {
			createdType= (ParameterizedType) node;
			if (createdType.getLocationInParent() != ClassInstanceCreation.TYPE_PROPERTY) {
				return false;
			}
		} else if (node instanceof ClassInstanceCreation) {
			ClassInstanceCreation creation= (ClassInstanceCreation) node;
			Type type= creation.getType();
			if (type instanceof ParameterizedType) {
				createdType= (ParameterizedType) type;
			}
		}
		
		if (createdType == null || createdType.typeArguments().size() != 0) {
			return false;
		}
		
		ITypeBinding binding= createdType.resolveBinding();
		if (binding == null) {
			return false;
		}
		
		ITypeBinding[] typeArguments= binding.getTypeArguments();
		if (typeArguments.length == 0) {
			return false;
		}
		
		if (resultingCollections == null) {
			return true;
		}

		// don't add if already added as quick fix
		if (containsMatchingProblem(locations, IProblem.DiamondNotBelow17))
			return false;
		
		AST ast= node.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);
		ImportRewrite importRewrite= StubUtility.createImportRewrite(context.getASTRoot(), true);
		ContextSensitiveImportRewriteContext importContext= new ContextSensitiveImportRewriteContext(context.getASTRoot(), createdType.getStartPosition(), importRewrite);

		String label= CorrectionMessages.QuickAssistProcessor_infer_diamond_description;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
		int relevance= locations == null ? 7 : 1; // if error -> higher than ReorgCorrectionsSubProcessor.getNeedHigherComplianceProposals()
		LinkedCorrectionProposal proposal= new LinkedCorrectionProposal(label, context.getCompilationUnit(), rewrite, relevance, image);

		ListRewrite argumentsRewrite= rewrite.getListRewrite(createdType, ParameterizedType.TYPE_ARGUMENTS_PROPERTY);
		for (int i= 0; i < typeArguments.length; i++) {
			ITypeBinding typeArgument= typeArguments[i];
			Type argumentNode= importRewrite.addImport(typeArgument, ast, importContext);
			argumentsRewrite.insertLast(argumentNode, null);
			proposal.addLinkedPosition(rewrite.track(argumentNode), true, "arg" + i); //$NON-NLS-1$
		}

		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getJoinVariableProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		ASTNode parent= node.getParent();

		VariableDeclarationFragment fragment= null;
		boolean onFirstAccess= false;
		if (node instanceof SimpleName && node.getLocationInParent() == Assignment.LEFT_HAND_SIDE_PROPERTY) {
			onFirstAccess= true;
			SimpleName name= (SimpleName) node;
			IBinding binding= name.resolveBinding();
			if (!(binding instanceof IVariableBinding)) {
				return false;
			}
			ASTNode declaring= context.getASTRoot().findDeclaringNode(binding);
			if (declaring instanceof VariableDeclarationFragment) {
				fragment= (VariableDeclarationFragment) declaring;
			} else {
				return false;
			}
		} else if (parent instanceof VariableDeclarationFragment) {
			fragment= (VariableDeclarationFragment) parent;
		} else {
			return false;
		}

		IVariableBinding binding= fragment.resolveBinding();
		Expression initializer= fragment.getInitializer();
		if ((initializer != null && initializer.getNodeType() != ASTNode.NULL_LITERAL) || binding == null || binding.isField()) {
			return false;
		}

		if (!(fragment.getParent() instanceof VariableDeclarationStatement)) {
			return false;
		}
		VariableDeclarationStatement statement= (VariableDeclarationStatement) fragment.getParent();

		SimpleName[] names= LinkedNodeFinder.findByBinding(statement.getParent(), binding);
		if (names.length <= 1 || names[0] != fragment.getName()) {
			return false;
		}
		SimpleName firstAccess= names[1];
		if (onFirstAccess) {
			if (firstAccess != node) {
				return false;
			}
		} else {
			if (firstAccess.getLocationInParent() != Assignment.LEFT_HAND_SIDE_PROPERTY) {
				return false;
			}
		}
		Assignment assignment= (Assignment) firstAccess.getParent();
		if (assignment.getLocationInParent() != ExpressionStatement.EXPRESSION_PROPERTY) {
			return false;
		}
		ExpressionStatement assignParent= (ExpressionStatement) assignment.getParent();

		if (resultingCollections == null) {
			return true;
		}

		AST ast= statement.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);
		TightSourceRangeComputer sourceRangeComputer= new TightSourceRangeComputer();
		sourceRangeComputer.addTightSourceNode(assignParent);
		rewrite.setTargetSourceRangeComputer(sourceRangeComputer);

		String label= CorrectionMessages.QuickAssistProcessor_joindeclaration_description;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_LOCAL);
		LinkedCorrectionProposal proposal= new LinkedCorrectionProposal(label, context.getCompilationUnit(), rewrite, 1, image);
		proposal.setCommandId(SPLIT_JOIN_VARIABLE_DECLARATION_ID);

		Expression placeholder= (Expression) rewrite.createMoveTarget(assignment.getRightHandSide());
		rewrite.set(fragment, VariableDeclarationFragment.INITIALIZER_PROPERTY, placeholder, null);


		if (onFirstAccess) {
			// replace assignment with variable declaration
			rewrite.replace(assignParent, rewrite.createMoveTarget(statement), null);
		} else {
			// different scopes -> remove assignments, set variable initializer
			if (ASTNodes.isControlStatementBody(assignParent.getLocationInParent())) {
				Block block= ast.newBlock();
				rewrite.replace(assignParent, block, null);
			} else {
				rewrite.remove(assignParent, null);
			}
		}

		proposal.setEndPosition(rewrite.track(fragment.getName()));
		resultingCollections.add(proposal);
		return true;

	}

	private static boolean getSplitVariableProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		VariableDeclarationFragment fragment;
		if (node instanceof VariableDeclarationFragment) {
			fragment= (VariableDeclarationFragment) node;
		} else if (node.getLocationInParent() == VariableDeclarationFragment.NAME_PROPERTY) {
			fragment= (VariableDeclarationFragment) node.getParent();
		} else {
			return false;
		}

		if (fragment.getInitializer() == null) {
			return false;
		}

		Statement statement;
		ASTNode fragParent= fragment.getParent();
		if (fragParent instanceof VariableDeclarationStatement) {
			statement= (VariableDeclarationStatement) fragParent;
		} else if (fragParent instanceof VariableDeclarationExpression) {
			if (fragParent.getLocationInParent() == TryStatement.RESOURCES_PROPERTY) {
				return false;
			}
			statement= (Statement) fragParent.getParent();
		} else {
			return false;
		}
		// statement is ForStatement or VariableDeclarationStatement

		ASTNode statementParent= statement.getParent();
		StructuralPropertyDescriptor property= statement.getLocationInParent();
		if (!property.isChildListProperty()) {
			return false;
		}

		List<? extends ASTNode> list= (List<? extends ASTNode>) statementParent.getStructuralProperty(property);

		if (resultingCollections == null) {
			return true;
		}

		AST ast= statement.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);

		String label= CorrectionMessages.QuickAssistProcessor_splitdeclaration_description;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_LOCAL);
		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 1, image);
		boolean commandConflict= false;
		for (Iterator<ICommandAccess> iterator= resultingCollections.iterator(); iterator.hasNext();) {
			Object completionProposal= iterator.next();
			if (completionProposal instanceof ChangeCorrectionProposal) {
				if (SPLIT_JOIN_VARIABLE_DECLARATION_ID.equals(((ChangeCorrectionProposal)completionProposal).getCommandId())) {
					commandConflict= true;
				}
			}
		}
		if (!commandConflict) {
			proposal.setCommandId(SPLIT_JOIN_VARIABLE_DECLARATION_ID);
		}

		Statement newStatement;
		int insertIndex= list.indexOf(statement);

		Expression placeholder= (Expression) rewrite.createMoveTarget(fragment.getInitializer());
		ITypeBinding binding= fragment.getInitializer().resolveTypeBinding();
		if (placeholder instanceof ArrayInitializer && binding != null && binding.isArray()) {
			ArrayCreation creation= ast.newArrayCreation();
			creation.setInitializer((ArrayInitializer) placeholder);
			final ITypeBinding componentType= binding.getElementType();
			Type type= null;
			if (componentType.isPrimitive())
				type= ast.newPrimitiveType(PrimitiveType.toCode(componentType.getName()));
			else
				type= ast.newSimpleType(ast.newSimpleName(componentType.getName()));
			creation.setType(ast.newArrayType(type, binding.getDimensions()));
			placeholder= creation;
		}
		Assignment assignment= ast.newAssignment();
		assignment.setRightHandSide(placeholder);
		assignment.setLeftHandSide(ast.newSimpleName(fragment.getName().getIdentifier()));

		if (statement instanceof VariableDeclarationStatement) {
			newStatement= ast.newExpressionStatement(assignment);
			insertIndex+= 1; // add after declaration
		} else {
			rewrite.replace(fragment.getParent(), assignment, null);
			VariableDeclarationFragment newFrag= ast.newVariableDeclarationFragment();
			newFrag.setName(ast.newSimpleName(fragment.getName().getIdentifier()));
			newFrag.setExtraDimensions(fragment.getExtraDimensions());

			VariableDeclarationExpression oldVarDecl= (VariableDeclarationExpression) fragParent;

			VariableDeclarationStatement newVarDec= ast.newVariableDeclarationStatement(newFrag);
			newVarDec.setType((Type) ASTNode.copySubtree(ast, oldVarDecl.getType()));
			newVarDec.modifiers().addAll(ASTNodeFactory.newModifiers(ast, oldVarDecl.getModifiers()));
			newStatement= newVarDec;
		}

		ListRewrite listRewriter= rewrite.getListRewrite(statementParent, (ChildListPropertyDescriptor) property);
		listRewriter.insertAt(newStatement, insertIndex, null);

		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getConvertStringConcatenationProposals(IInvocationContext context, Collection<ICommandAccess> resultingCollections) {
		ASTNode node= context.getCoveringNode();
		BodyDeclaration parentDecl= ASTResolving.findParentBodyDeclaration(node);
		if (!(parentDecl instanceof MethodDeclaration || parentDecl instanceof Initializer))
			return false;

		AST ast= node.getAST();
		ITypeBinding stringBinding= ast.resolveWellKnownType("java.lang.String"); //$NON-NLS-1$

		if (node instanceof Expression && !(node instanceof InfixExpression)) {
			node= node.getParent();
		}
		if (node instanceof VariableDeclarationFragment) {
			node= ((VariableDeclarationFragment) node).getInitializer();
		} else if (node instanceof Assignment) {
			node= ((Assignment) node).getRightHandSide();
		}

		InfixExpression oldInfixExpression= null;
		while (node instanceof InfixExpression) {
			InfixExpression curr= (InfixExpression) node;
			if (curr.resolveTypeBinding() == stringBinding && curr.getOperator() == InfixExpression.Operator.PLUS) {
				oldInfixExpression= curr; // is a infix expression we can use
			} else {
				break;
			}
			node= node.getParent();
		}
		if (oldInfixExpression == null)
			return false;

		if (resultingCollections == null) {
			return true;
		}

		LinkedCorrectionProposal stringBufferProposal= getConvertToStringBufferProposal(context, ast, oldInfixExpression);
		resultingCollections.add(stringBufferProposal);

		ASTRewriteCorrectionProposal messageFormatProposal= getConvertToMessageFormatProposal(context, ast, oldInfixExpression);
		if (messageFormatProposal != null)
			resultingCollections.add(messageFormatProposal);

		return true;
	}

	private static LinkedCorrectionProposal getConvertToStringBufferProposal(IInvocationContext context, AST ast, InfixExpression oldInfixExpression) {
		String bufferOrBuilderName;
		ICompilationUnit cu= context.getCompilationUnit();
		if (JavaModelUtil.is50OrHigher(cu.getJavaProject())) {
			bufferOrBuilderName= "StringBuilder"; //$NON-NLS-1$
		} else {
			bufferOrBuilderName= "StringBuffer"; //$NON-NLS-1$
		}

		ASTRewrite rewrite= ASTRewrite.create(ast);

		SimpleName existingBuffer= getEnclosingAppendBuffer(oldInfixExpression);
		
		String mechanismName= BasicElementLabels.getJavaElementName(existingBuffer == null ? bufferOrBuilderName : existingBuffer.getIdentifier());
		String label= Messages.format(CorrectionMessages.QuickAssistProcessor_convert_to_string_buffer_description, mechanismName);
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
		LinkedCorrectionProposal proposal= new LinkedCorrectionProposal(label, cu, rewrite, 1, image);
		proposal.setCommandId(CONVERT_TO_STRING_BUFFER_ID);

		Statement insertAfter;
		String bufferName;

		String groupID= "nameId"; //$NON-NLS-1$
		ListRewrite listRewrite;

		Statement enclosingStatement= ASTResolving.findParentStatement(oldInfixExpression);

		if (existingBuffer != null) {
			if (ASTNodes.isControlStatementBody(enclosingStatement.getLocationInParent())) {
				Block newBlock= ast.newBlock();
				listRewrite= rewrite.getListRewrite(newBlock, Block.STATEMENTS_PROPERTY);
				insertAfter= null;
				rewrite.replace(enclosingStatement, newBlock, null);
			} else {
				listRewrite= rewrite.getListRewrite(enclosingStatement.getParent(), (ChildListPropertyDescriptor) enclosingStatement.getLocationInParent());
				insertAfter= enclosingStatement;
			}

			bufferName= existingBuffer.getIdentifier();

		} else {
			// create buffer
			VariableDeclarationFragment frag= ast.newVariableDeclarationFragment();
			// check if name is already in use and provide alternative
			List<String> fExcludedVariableNames= Arrays.asList(ASTResolving.getUsedVariableNames(oldInfixExpression));

			SimpleType bufferType= ast.newSimpleType(ast.newName(bufferOrBuilderName));
			ClassInstanceCreation newBufferExpression= ast.newClassInstanceCreation();

			String[] newBufferNames= StubUtility.getVariableNameSuggestions(NamingConventions.VK_LOCAL, cu.getJavaProject(), bufferOrBuilderName, 0, fExcludedVariableNames, true);
			bufferName= newBufferNames[0];

			SimpleName bufferNameDeclaration= ast.newSimpleName(bufferName);
			frag.setName(bufferNameDeclaration);

			proposal.addLinkedPosition(rewrite.track(bufferNameDeclaration), true, groupID);
			for (int i= 0; i < newBufferNames.length; i++) {
				proposal.addLinkedPositionProposal(groupID, newBufferNames[i], null);
			}


			newBufferExpression.setType(bufferType);
			frag.setInitializer(newBufferExpression);


			VariableDeclarationStatement bufferDeclaration= ast.newVariableDeclarationStatement(frag);
			bufferDeclaration.setType(ast.newSimpleType(ast.newName(bufferOrBuilderName)));
			insertAfter= bufferDeclaration;

			Statement statement= ASTResolving.findParentStatement(oldInfixExpression);
			if (ASTNodes.isControlStatementBody(statement.getLocationInParent())) {
				Block newBlock= ast.newBlock();
				listRewrite= rewrite.getListRewrite(newBlock, Block.STATEMENTS_PROPERTY);
				listRewrite.insertFirst(bufferDeclaration, null);
				listRewrite.insertLast(rewrite.createMoveTarget(statement), null);
				rewrite.replace(statement, newBlock, null);
			} else {
				listRewrite= rewrite.getListRewrite(statement.getParent(), (ChildListPropertyDescriptor) statement.getLocationInParent());
				listRewrite.insertBefore(bufferDeclaration, statement, null);
			}
		}

		List<Expression> operands= new ArrayList<Expression>();
		collectInfixPlusOperands(oldInfixExpression, operands);
		
		Statement lastAppend= insertAfter;
		for (Iterator<Expression> iter= operands.iterator(); iter.hasNext();) {
			Expression operand= iter.next();

			MethodInvocation appendIncovationExpression= ast.newMethodInvocation();
			appendIncovationExpression.setName(ast.newSimpleName("append")); //$NON-NLS-1$
			SimpleName bufferNameReference= ast.newSimpleName(bufferName);

			// If there was an existing name, don't offer to rename it
			if (existingBuffer == null) {
				proposal.addLinkedPosition(rewrite.track(bufferNameReference), true, groupID);
			}

			appendIncovationExpression.setExpression(bufferNameReference);
			appendIncovationExpression.arguments().add(rewrite.createCopyTarget(operand));

			ExpressionStatement appendExpressionStatement= ast.newExpressionStatement(appendIncovationExpression);
			if (lastAppend == null) {
				listRewrite.insertFirst(appendExpressionStatement, null);
			} else {
				listRewrite.insertAfter(appendExpressionStatement, lastAppend, null);
			}
			lastAppend= appendExpressionStatement;
		}

		if (existingBuffer != null) {
			proposal.setEndPosition(rewrite.track(lastAppend));
			if (insertAfter != null) {
				rewrite.remove(enclosingStatement, null);
			}
		} else {
			// replace old expression with toString
			MethodInvocation bufferToString= ast.newMethodInvocation();
			bufferToString.setName(ast.newSimpleName("toString")); //$NON-NLS-1$
			SimpleName bufferNameReference= ast.newSimpleName(bufferName);
			bufferToString.setExpression(bufferNameReference);
			proposal.addLinkedPosition(rewrite.track(bufferNameReference), true, groupID);

			rewrite.replace(oldInfixExpression, bufferToString, null);
			proposal.setEndPosition(rewrite.track(bufferToString));
		}

		return proposal;
	}

	private static void collectInfixPlusOperands(Expression expression, List<Expression> collector) {
		if (expression instanceof InfixExpression && ((InfixExpression)expression).getOperator() == InfixExpression.Operator.PLUS) {
			InfixExpression infixExpression= (InfixExpression)expression;
			
			collectInfixPlusOperands(infixExpression.getLeftOperand(), collector);
			collectInfixPlusOperands(infixExpression.getRightOperand(), collector);
			List<Expression> extendedOperands= infixExpression.extendedOperands();
			for (Iterator<Expression> iter= extendedOperands.iterator(); iter.hasNext();) {
				collectInfixPlusOperands(iter.next(), collector);
			}
			
		} else {
			collector.add(expression);
		}
	}

	/**
	 * Checks
	 * <ul>
	 * <li>whether the given infix expression is the argument of a StringBuilder#append() or
	 * StringBuffer#append() invocation, and</li>
	 * <li>the append method is called on a simple variable, and</li>
	 * <li>the invocation occurs in a statement (not as nested expression)</li>
	 * </ul>
	 *
	 * @param infixExpression the infix expression
	 * @return the name of the variable we were appending to, or <code>null</code> if not matching
	 */
	private static SimpleName getEnclosingAppendBuffer(InfixExpression infixExpression) {
		if (infixExpression.getLocationInParent() == MethodInvocation.ARGUMENTS_PROPERTY) {
			MethodInvocation methodInvocation= (MethodInvocation)infixExpression.getParent();

			// ..not in an expression.. (e.g. not sb.append("high" + 5).append(6);)
			if (methodInvocation.getParent() instanceof Statement) {

				// ..of a function called append:
				if ("append".equals(methodInvocation.getName().getIdentifier())) { //$NON-NLS-1$
					Expression expression= methodInvocation.getExpression();

					// ..and the append is being called on a Simple object:
					if (expression instanceof SimpleName) {
						IBinding binding= ((SimpleName)expression).resolveBinding();
						if (binding instanceof IVariableBinding) {
							String typeName= ((IVariableBinding)binding).getType().getQualifiedName();
	
							// And the object's type is a StringBuilder or StringBuffer:
							if ("java.lang.StringBuilder".equals(typeName) || "java.lang.StringBuffer".equals(typeName)) { //$NON-NLS-1$ //$NON-NLS-2$
								return (SimpleName)expression;
							}
						}
					}
				}
			}
		}
		return null;
	}
	
	private static ASTRewriteCorrectionProposal getConvertToMessageFormatProposal(IInvocationContext context, AST ast, InfixExpression oldInfixExpression) {

		ICompilationUnit cu= context.getCompilationUnit();
		boolean is50OrHigher= JavaModelUtil.is50OrHigher(cu.getJavaProject());

		ASTRewrite rewrite= ASTRewrite.create(ast);
		CompilationUnit root= context.getASTRoot();
		ImportRewrite importRewrite= StubUtility.createImportRewrite(root, true);
		ContextSensitiveImportRewriteContext importContext= new ContextSensitiveImportRewriteContext(root, oldInfixExpression.getStartPosition(), importRewrite);

		// collect operands
		List<Expression> operands= new ArrayList<Expression>();
		collectInfixPlusOperands(oldInfixExpression, operands);

		List<Expression> formatArguments= new ArrayList<Expression>();
		String formatString= ""; //$NON-NLS-1$
		int i= 0;
		for (Iterator<Expression> iterator= operands.iterator(); iterator.hasNext();) {
			Expression operand= iterator.next();

			if (operand instanceof StringLiteral) {
				String value= ((StringLiteral) operand).getEscapedValue();
				value= value.substring(1, value.length() - 1);
				value= value.replaceAll("'", "''"); //$NON-NLS-1$ //$NON-NLS-2$
				formatString+= value;
			} else {
				formatString+= "{" + i + "}"; //$NON-NLS-1$ //$NON-NLS-2$

				Expression argument;
				if (is50OrHigher) {
					argument= (Expression) rewrite.createCopyTarget(operand);
				} else {
					ITypeBinding binding= operand.resolveTypeBinding();
					if (binding == null)
						return null;

					argument= (Expression) rewrite.createCopyTarget(operand);

					if (binding.isPrimitive()) {
						ITypeBinding boxedBinding= Bindings.getBoxedTypeBinding(binding, ast);
						if (boxedBinding != binding) {
							Type boxedType= importRewrite.addImport(boxedBinding, ast, importContext);
							ClassInstanceCreation cic= ast.newClassInstanceCreation();
							cic.setType(boxedType);
							cic.arguments().add(argument);
							argument= cic;
						}
					}
				}

				formatArguments.add(argument);
				i++;
			}
		}

		if (formatArguments.size() == 0)
			return null;

		String label= CorrectionMessages.QuickAssistProcessor_convert_to_message_format;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);

		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, cu, rewrite, 0, image);
		proposal.setCommandId(CONVERT_TO_MESSAGE_FORMAT_ID);

		proposal.setImportRewrite(importRewrite);

		String messageType= importRewrite.addImport("java.text.MessageFormat", importContext); //$NON-NLS-1$

		MethodInvocation formatInvocation= ast.newMethodInvocation();
		formatInvocation.setExpression(ast.newName(messageType));
		formatInvocation.setName(ast.newSimpleName("format")); //$NON-NLS-1$

		List<Expression> arguments= formatInvocation.arguments();

		StringLiteral formatStringArgument= ast.newStringLiteral();
		formatStringArgument.setEscapedValue("\"" + formatString + "\""); //$NON-NLS-1$ //$NON-NLS-2$
		arguments.add(formatStringArgument);

		if (is50OrHigher) {
			for (Iterator<Expression> iterator= formatArguments.iterator(); iterator.hasNext();) {
				arguments.add(iterator.next());
			}
		} else {
			ArrayCreation objectArrayCreation= ast.newArrayCreation();

			Type objectType= ast.newSimpleType(ast.newSimpleName("Object")); //$NON-NLS-1$
			ArrayType arrayType= ast.newArrayType(objectType);
			objectArrayCreation.setType(arrayType);

			ArrayInitializer arrayInitializer= ast.newArrayInitializer();

			List<Expression> initializerExpressions= arrayInitializer.expressions();
			for (Iterator<Expression> iterator= formatArguments.iterator(); iterator.hasNext();) {
				initializerExpressions.add(iterator.next());
			}
			objectArrayCreation.setInitializer(arrayInitializer);

			arguments.add(objectArrayCreation);
		}

		rewrite.replace(oldInfixExpression, formatInvocation, null);

		return proposal;
	}

	public static boolean getAssignToVariableProposals(IInvocationContext context, ASTNode node, IProblemLocation[] locations, Collection<ICommandAccess> resultingCollections) {
		Statement statement= ASTResolving.findParentStatement(node);
		if (!(statement instanceof ExpressionStatement)) {
			return false;
		}
		ExpressionStatement expressionStatement= (ExpressionStatement) statement;

		Expression expression= expressionStatement.getExpression();
		if (expression.getNodeType() == ASTNode.ASSIGNMENT) {
			return false; // too confusing and not helpful
		}

		ITypeBinding typeBinding= expression.resolveTypeBinding();
		typeBinding= Bindings.normalizeTypeBinding(typeBinding);
		if (typeBinding == null) {
			return false;
		}
		if (resultingCollections == null) {
			return true;
		}

		// don't add if already added as quick fix
		if (containsMatchingProblem(locations, IProblem.UnusedObjectAllocation))
			return false;
		
		ICompilationUnit cu= context.getCompilationUnit();

		AssignToVariableAssistProposal localProposal= new AssignToVariableAssistProposal(cu, AssignToVariableAssistProposal.LOCAL, expressionStatement, typeBinding, 3);
		localProposal.setCommandId(ASSIGN_TO_LOCAL_ID);
		resultingCollections.add(localProposal);

		ASTNode type= ASTResolving.findParentType(expression);
		if (type != null) {
			AssignToVariableAssistProposal fieldProposal= new AssignToVariableAssistProposal(cu, AssignToVariableAssistProposal.FIELD, expressionStatement, typeBinding, 2);
			fieldProposal.setCommandId(ASSIGN_TO_FIELD_ID);
			resultingCollections.add(fieldProposal);
		}
		return true;

	}

	private static boolean containsMatchingProblem(IProblemLocation[] locations, int problemId) {
		if (locations != null) {
			for (int i= 0; i < locations.length; i++) {
				IProblemLocation location= locations[i];
				if (IJavaModelMarker.JAVA_MODEL_PROBLEM_MARKER.equals(location.getMarkerType())
						&& location.getProblemId() == problemId) {
					return true;
				}
			}
		}
		return false;
	}

	private static boolean getAssignParamToFieldProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		node= ASTNodes.getNormalizedNode(node);
		ASTNode parent= node.getParent();
		if (!(parent instanceof SingleVariableDeclaration) || !(parent.getParent() instanceof MethodDeclaration)) {
			return false;
		}
		SingleVariableDeclaration paramDecl= (SingleVariableDeclaration) parent;
		IVariableBinding binding= paramDecl.resolveBinding();

		MethodDeclaration methodDecl= (MethodDeclaration) parent.getParent();
		if (binding == null || methodDecl.getBody() == null) {
			return false;
		}
		ITypeBinding typeBinding= binding.getType();
		if (typeBinding == null) {
			return false;
		}

		if (resultingCollections == null) {
			return true;
		}

		ITypeBinding parentType= Bindings.getBindingOfParentType(node);
		if (parentType != null) {
			// assign to existing fields
			CompilationUnit root= context.getASTRoot();
			IVariableBinding[] declaredFields= parentType.getDeclaredFields();
			boolean isStaticContext= ASTResolving.isInStaticContext(node);
			for (int i= 0; i < declaredFields.length; i++) {
				IVariableBinding curr= declaredFields[i];
				if (isStaticContext == Modifier.isStatic(curr.getModifiers()) && typeBinding.isAssignmentCompatible(curr.getType())) {
					ASTNode fieldDeclFrag= root.findDeclaringNode(curr);
					if (fieldDeclFrag instanceof VariableDeclarationFragment) {
						VariableDeclarationFragment fragment= (VariableDeclarationFragment) fieldDeclFrag;
						if (fragment.getInitializer() == null) {
							resultingCollections.add(new AssignToVariableAssistProposal(context.getCompilationUnit(), paramDecl, fragment, typeBinding, 1));
						}
					}
				}
			}
		}

		AssignToVariableAssistProposal fieldProposal= new AssignToVariableAssistProposal(context.getCompilationUnit(), paramDecl, null, typeBinding, 3);
		fieldProposal.setCommandId(ASSIGN_PARAM_TO_FIELD_ID);
		resultingCollections.add(fieldProposal);
		return true;
	}

	private static boolean getAddFinallyProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		TryStatement tryStatement= ASTResolving.findParentTryStatement(node);
		if (tryStatement == null || tryStatement.getFinally() != null) {
			return false;
		}
		Statement statement= ASTResolving.findParentStatement(node);
		if (tryStatement != statement && tryStatement.getBody() != statement) {
			return false; // an node inside a catch or finally block
		}

		if (resultingCollections == null) {
			return true;
		}

		AST ast= tryStatement.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);
		Block finallyBody= ast.newBlock();

		rewrite.set(tryStatement, TryStatement.FINALLY_PROPERTY, finallyBody, null);

		String label= CorrectionMessages.QuickAssistProcessor_addfinallyblock_description;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_ADD);
		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 1, image);
		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getAddElseProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		if (!(node instanceof IfStatement)) {
			return false;
		}
		IfStatement ifStatement= (IfStatement) node;
		if (ifStatement.getElseStatement() != null) {
			return false;
		}

		if (resultingCollections == null) {
			return true;
		}

		AST ast= node.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);
		Block body= ast.newBlock();

		rewrite.set(ifStatement, IfStatement.ELSE_STATEMENT_PROPERTY, body, null);

		String label= CorrectionMessages.QuickAssistProcessor_addelseblock_description;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_ADD);
		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 1, image);
		resultingCollections.add(proposal);
		return true;
	}

	public static boolean getCatchClauseToThrowsProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		CatchClause catchClause= (CatchClause) ASTResolving.findAncestor(node, ASTNode.CATCH_CLAUSE);
		if (catchClause == null) {
			return false;
		}

		Statement statement= ASTResolving.findParentStatement(node);
		if (statement != catchClause.getParent() && statement != catchClause.getBody()) {
			return false; // selection is in a statement inside the body
		}

		Type type= catchClause.getException().getType();
		if (!type.isSimpleType() && !type.isUnionType()) {
			return false;
		}

		BodyDeclaration bodyDeclaration= ASTResolving.findParentBodyDeclaration(catchClause);
		if (!(bodyDeclaration instanceof MethodDeclaration) && !(bodyDeclaration instanceof Initializer)) {
			return false;
		}

		if (resultingCollections == null) {
			return true;
		}

		AST ast= bodyDeclaration.getAST();
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_OBJS_EXCEPTION);

		SimpleType selectedMultiCatchType= null;
		if (type.isUnionType() && node instanceof Name) {
			Name topMostName= ASTNodes.getTopMostName((Name) node);
			ASTNode parent= topMostName.getParent();
			if (parent instanceof SimpleType) {
				selectedMultiCatchType= (SimpleType) parent;
			}
		}

		if (bodyDeclaration instanceof MethodDeclaration) {
			MethodDeclaration methodDeclaration= (MethodDeclaration) bodyDeclaration;

			ASTRewrite rewrite= ASTRewrite.create(ast);
			if (selectedMultiCatchType != null) {
				removeException(rewrite, (UnionType) type, selectedMultiCatchType);
				addExceptionToThrows(ast, methodDeclaration, rewrite, selectedMultiCatchType);
				String label= CorrectionMessages.QuickAssistProcessor_exceptiontothrows_description;
				ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 6, image);
				resultingCollections.add(proposal);
			} else {
				removeCatchBlock(rewrite, catchClause);
				if (type.isUnionType()) {
					UnionType unionType= (UnionType) type;
					List<Type> types= unionType.types();
					for (Type elementType : types) {
						if (!(elementType instanceof SimpleType))
							return false;
						addExceptionToThrows(ast, methodDeclaration, rewrite, (SimpleType) elementType);
					}
				} else {
					addExceptionToThrows(ast, methodDeclaration, rewrite, (SimpleType) type);
				}
				String label= CorrectionMessages.QuickAssistProcessor_catchclausetothrows_description;
				ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 4, image);
				resultingCollections.add(proposal);
			}
		}
		{ // for initializers or method declarations
			ASTRewrite rewrite= ASTRewrite.create(ast);
			if (selectedMultiCatchType != null) {
				removeException(rewrite, (UnionType) type, selectedMultiCatchType);
				String label= CorrectionMessages.QuickAssistProcessor_removeexception_description;
				ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 6, image);
				resultingCollections.add(proposal);
			} else {
				removeCatchBlock(rewrite, catchClause);
				String label= CorrectionMessages.QuickAssistProcessor_removecatchclause_description;
				ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 5, image);
				resultingCollections.add(proposal);
			}
		}

		return true;
	}

	private static void removeException(ASTRewrite rewrite, UnionType unionType, Type exception) {
		ListRewrite listRewrite= rewrite.getListRewrite(unionType, UnionType.TYPES_PROPERTY);
		List<Type> types= unionType.types();
		for (Iterator<Type> iterator= types.iterator(); iterator.hasNext();) {
			Type type= iterator.next();
			if (type.equals(exception)) {
				listRewrite.remove(type, null);
			}
		}
	}

	private static void addExceptionToThrows(AST ast, MethodDeclaration methodDeclaration, ASTRewrite rewrite, SimpleType type2) {
		ITypeBinding binding= type2.resolveBinding();
		if (binding == null || isNotYetThrown(binding, methodDeclaration.thrownExceptions())) {
			Name name= type2.getName();
			Name newName= (Name) ASTNode.copySubtree(ast, name);

			ListRewrite listRewriter= rewrite.getListRewrite(methodDeclaration, MethodDeclaration.THROWN_EXCEPTIONS_PROPERTY);
			listRewriter.insertLast(newName, null);
		}
	}

	private static void removeCatchBlock(ASTRewrite rewrite, CatchClause catchClause) {
		TryStatement tryStatement= (TryStatement) catchClause.getParent();
		if (tryStatement.catchClauses().size() > 1 || tryStatement.getFinally() != null || (tryStatement.getAST().apiLevel() >= AST.JLS4 && !tryStatement.resources().isEmpty())) {
			rewrite.remove(catchClause, null);
		} else {
			Block block= tryStatement.getBody();
			List<Statement> statements= block.statements();
			int nStatements= statements.size();
			if (nStatements == 1) {
				ASTNode first= statements.get(0);
				rewrite.replace(tryStatement, rewrite.createCopyTarget(first), null);
			} else if (nStatements > 1) {
				ListRewrite listRewrite= rewrite.getListRewrite(block, Block.STATEMENTS_PROPERTY);
				ASTNode first= statements.get(0);
				ASTNode last= statements.get(statements.size() - 1);
				ASTNode newStatement= listRewrite.createCopyTarget(first, last);
				if (ASTNodes.isControlStatementBody(tryStatement.getLocationInParent())) {
					Block newBlock= rewrite.getAST().newBlock();
					newBlock.statements().add(newStatement);
					newStatement= newBlock;
				}
				rewrite.replace(tryStatement, newStatement, null);
			} else {
				rewrite.remove(tryStatement, null);
			}
		}
	}

	private static boolean isNotYetThrown(ITypeBinding binding, List<Name> thrownExceptions) {
		for (int i= 0; i < thrownExceptions.size(); i++) {
			Name name= thrownExceptions.get(i);
			ITypeBinding elem= (ITypeBinding) name.resolveBinding();
			if (elem != null) {
				if (Bindings.isSuperType(elem, binding)) { // existing exception is base class of new
					return false;
				}
			}
		}
		return true;
	}

	private static boolean getPickoutTypeFromMulticatchProposals(IInvocationContext context, ASTNode node, ArrayList<ASTNode> coveredNodes, Collection<ICommandAccess> resultingCollections) {
		CatchClause catchClause= (CatchClause) ASTResolving.findAncestor(node, ASTNode.CATCH_CLAUSE);
		if (catchClause == null) {
			return false;
		}

		Statement statement= ASTResolving.findParentStatement(node);
		if (statement != catchClause.getParent() && statement != catchClause.getBody()) {
			return false; // selection is in a statement inside the body
		}

		Type type= catchClause.getException().getType();
		if (!type.isUnionType()) {
			return false;
		}

		SimpleType selectedMultiCatchType= null;
		if (type.isUnionType() && node instanceof Name) {
			Name topMostName= ASTNodes.getTopMostName((Name) node);
			ASTNode parent= topMostName.getParent();
			if (parent instanceof SimpleType) {
				selectedMultiCatchType= (SimpleType) parent;
			}
		}

		boolean multipleExceptions= coveredNodes.size() > 1;
		if ((selectedMultiCatchType == null) && (!(node instanceof UnionType) || !multipleExceptions)) {
			return false;
		}

		if (!multipleExceptions) {
			coveredNodes.add(selectedMultiCatchType);
		}

		BodyDeclaration bodyDeclaration= ASTResolving.findParentBodyDeclaration(catchClause);
		if (!(bodyDeclaration instanceof MethodDeclaration) && !(bodyDeclaration instanceof Initializer)) {
			return false;
		}

		if (resultingCollections == null) {
			return true;
		}

		AST ast= bodyDeclaration.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);

		CatchClause newCatchClause= ast.newCatchClause();
		SingleVariableDeclaration newSingleVariableDeclaration= ast.newSingleVariableDeclaration();
		UnionType newUnionType= ast.newUnionType();
		List<Type> types= newUnionType.types();
		for (int i= 0; i < coveredNodes.size(); i++) {
			ASTNode typeNode= coveredNodes.get(i);
			types.add((Type) rewrite.createCopyTarget(typeNode));
			rewrite.remove(typeNode, null);
		}
		newSingleVariableDeclaration.setType(newUnionType);
		newSingleVariableDeclaration.setName((SimpleName) rewrite.createCopyTarget(catchClause.getException().getName()));
		newCatchClause.setException(newSingleVariableDeclaration);

		setCatchClauseBody(newCatchClause, rewrite, catchClause);

		TryStatement tryStatement= (TryStatement)catchClause.getParent();
		ListRewrite listRewrite= rewrite.getListRewrite(tryStatement, TryStatement.CATCH_CLAUSES_PROPERTY);
		listRewrite.insertAfter(newCatchClause, catchClause, null);

		Image image= JavaPluginImages.get(JavaPluginImages.IMG_OBJS_EXCEPTION);
		String label= !multipleExceptions
				? CorrectionMessages.QuickAssistProcessor_move_exception_to_separate_catch_block
				: CorrectionMessages.QuickAssistProcessor_move_exceptions_to_separate_catch_block;
		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 6, image);
		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getConvertToMultiCatchProposals(IInvocationContext context, ASTNode covering, Collection<ICommandAccess> resultingCollections) {
		if (!JavaModelUtil.is17OrHigher(context.getCompilationUnit().getJavaProject()))
			return false;

		CatchClause catchClause= (CatchClause) ASTResolving.findAncestor(covering, ASTNode.CATCH_CLAUSE);
		if (catchClause == null) {
			return false;
		}

		Statement statement= ASTResolving.findParentStatement(covering);
		if (statement != catchClause.getParent() && statement != catchClause.getBody()) {
			return false; // selection is in a statement inside the body
		}

		Type type1= catchClause.getException().getType();
		SimpleType selectedMultiCatchType= null;
		if (type1.isUnionType() && covering instanceof Name) {
			Name topMostName= ASTNodes.getTopMostName((Name) covering);
			ASTNode parent= topMostName.getParent();
			if (parent instanceof SimpleType) {
				selectedMultiCatchType= (SimpleType) parent;
			}
		}
		if (selectedMultiCatchType != null)
			return false;

		TryStatement tryStatement= (TryStatement) catchClause.getParent();
		List<CatchClause> catchClauses= tryStatement.catchClauses();
		if (catchClauses.size() <= 1)
			return false;

		String commonSource= null;
		try {
			IBuffer buffer= context.getCompilationUnit().getBuffer();
			for (Iterator<CatchClause> iterator= catchClauses.iterator(); iterator.hasNext();) {
				CatchClause catchClause1= iterator.next();
				Block body= catchClause1.getBody();
				String source= buffer.getText(body.getStartPosition(), body.getLength());
				if (commonSource == null) {
					commonSource= source;
				} else {
					if (!commonSource.equals(source))
						return false;
				}
			}
		} catch (JavaModelException e) {
			return false;
		}

		if (resultingCollections == null)
			return true;

		AST ast= covering.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);
		TightSourceRangeComputer sourceRangeComputer= new TightSourceRangeComputer();
		sourceRangeComputer.addTightSourceNode(catchClauses.get(catchClauses.size() - 1));
		rewrite.setTargetSourceRangeComputer(sourceRangeComputer);
		
		CatchClause firstCatchClause= catchClauses.get(0);

		UnionType newUnionType= ast.newUnionType();
		List<Type> types= newUnionType.types();
		for (Iterator<CatchClause> iterator= catchClauses.iterator(); iterator.hasNext();) {
			CatchClause catchClause1= iterator.next();
			Type type= catchClause1.getException().getType();
			if (type instanceof UnionType) {
				List<Type> types2= ((UnionType) type).types();
				for (Iterator<Type> iterator2= types2.iterator(); iterator2.hasNext();) {
					types.add((Type) rewrite.createCopyTarget(iterator2.next()));
				}
			} else {
				types.add((Type) rewrite.createCopyTarget(type));
			}
		}

		SingleVariableDeclaration newExceptionDeclaration= ast.newSingleVariableDeclaration();
		newExceptionDeclaration.setType(newUnionType);
		newExceptionDeclaration.setName((SimpleName) rewrite.createCopyTarget(firstCatchClause.getException().getName()));
		rewrite.replace(firstCatchClause.getException(), newExceptionDeclaration, null);

		for (int i= 1; i < catchClauses.size(); i++) {
			rewrite.remove(catchClauses.get(i), null);
		}

		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
		String label= CorrectionMessages.QuickAssistProcessor_convert_to_single_multicatch_block;
		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 2, image);
		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getUnrollMultiCatchProposals(IInvocationContext context, ASTNode covering, Collection<ICommandAccess> resultingCollections) {
		if (!JavaModelUtil.is17OrHigher(context.getCompilationUnit().getJavaProject()))
			return false;

		CatchClause catchClause= (CatchClause) ASTResolving.findAncestor(covering, ASTNode.CATCH_CLAUSE);
		if (catchClause == null) {
			return false;
		}

		Statement statement= ASTResolving.findParentStatement(covering);
		if (statement != catchClause.getParent() && statement != catchClause.getBody()) {
			return false; // selection is in a statement inside the body
		}

		Type type1= catchClause.getException().getType();
		SimpleType selectedMultiCatchType= null;
		if (type1.isUnionType() && covering instanceof Name) {
			Name topMostName= ASTNodes.getTopMostName((Name) covering);
			ASTNode parent= topMostName.getParent();
			if (parent instanceof SimpleType) {
				selectedMultiCatchType= (SimpleType) parent;
			}
		}
		if (selectedMultiCatchType != null)
			return false;

		SingleVariableDeclaration singleVariableDeclaration= catchClause.getException();
		Type type= singleVariableDeclaration.getType();
		if (!(type instanceof UnionType))
			return false;

		if (resultingCollections == null)
			return true;

		AST ast= covering.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);

		TryStatement tryStatement= (TryStatement) catchClause.getParent();
		ListRewrite listRewrite= rewrite.getListRewrite(tryStatement, TryStatement.CATCH_CLAUSES_PROPERTY);

		UnionType unionType= (UnionType) type;
		List<Type> types= unionType.types();
		for (int i= types.size() - 1; i >= 0; i--) {
			Type type2= types.get(i);
			CatchClause newCatchClause= ast.newCatchClause();

			SingleVariableDeclaration newSingleVariableDeclaration= ast.newSingleVariableDeclaration();
			newSingleVariableDeclaration.setType((Type) rewrite.createCopyTarget(type2));
			newSingleVariableDeclaration.setName((SimpleName) rewrite.createCopyTarget(singleVariableDeclaration.getName()));
			newCatchClause.setException(newSingleVariableDeclaration);
			setCatchClauseBody(newCatchClause, rewrite, catchClause);
			listRewrite.insertAfter(newCatchClause, catchClause, null);
		}
		rewrite.remove(catchClause, null);

		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
		String label= CorrectionMessages.QuickAssistProcessor_convert_to_multiple_singletype_catch_blocks;
		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 2, image);
		resultingCollections.add(proposal);
		return true;
	}

	private static void setCatchClauseBody(CatchClause newCatchClause, ASTRewrite rewrite, CatchClause catchClause) {
		// Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=350285
		
//		newCatchClause.setBody((Block) rewrite.createCopyTarget(catchClause.getBody()));
		
		//newCatchClause#setBody() destroys the formatting, hence copy statement by statement.
		List<Statement> statements= catchClause.getBody().statements();
		for (Iterator<Statement> iterator2= statements.iterator(); iterator2.hasNext();) {
			newCatchClause.getBody().statements().add(rewrite.createCopyTarget(iterator2.next()));
		}
	}

	private static boolean getRenameLocalProposals(IInvocationContext context, ASTNode node, IProblemLocation[] locations, Collection<ICommandAccess> resultingCollections) {
		if (!(node instanceof SimpleName)) {
			return false;
		}
		SimpleName name= (SimpleName) node;
		IBinding binding= name.resolveBinding();
		if (binding != null && binding.getKind() == IBinding.PACKAGE) {
			return false;
		}

		if (containsQuickFixableRenameLocal(locations)) {
			return false;
		}

		if (resultingCollections == null) {
			return true;
		}

		LinkedNamesAssistProposal proposal= new LinkedNamesAssistProposal(context, name);
		if (locations.length != 0) {
			proposal.setRelevance(1);
		}

		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getRenameRefactoringProposal(IInvocationContext context, ASTNode node, IProblemLocation[] locations, Collection<ICommandAccess> resultingCollections)
			throws CoreException {
		if (!(context instanceof AssistContext)) {
			return false;
		}
		IEditorPart editor= ((AssistContext)context).getEditor();
		if (!(editor instanceof JavaEditor))
			return false;
		
		if (!(node instanceof SimpleName)) {
			return false;
		}
		SimpleName name= (SimpleName) node;
		IBinding binding= name.resolveBinding();
		if (binding == null) {
			return false;
		}
		
		IJavaElement javaElement= binding.getJavaElement();
		if (javaElement == null || !RefactoringAvailabilityTester.isRenameElementAvailable(javaElement)) {
			return false;
		}
		
		if (resultingCollections == null) {
			return true;
		}
		
		RenameRefactoringProposal proposal= new RenameRefactoringProposal((JavaEditor) editor);
		if (locations.length != 0) {
			proposal.setRelevance(1);
		} else if (containsQuickFixableRenameLocal(locations)) {
			proposal.setRelevance(7);
		}
		

		resultingCollections.add(proposal);
		return true;
	}
	
	private static boolean containsQuickFixableRenameLocal(IProblemLocation[] locations) {
		if (locations != null) {
			for (int i= 0; i < locations.length; i++) {
				IProblemLocation location= locations[i];
				if (IJavaModelMarker.JAVA_MODEL_PROBLEM_MARKER.equals(location.getMarkerType())) {
					switch (location.getProblemId()) {
						case IProblem.LocalVariableHidingLocalVariable:
						case IProblem.LocalVariableHidingField:
						case IProblem.FieldHidingLocalVariable:
						case IProblem.FieldHidingField:
						case IProblem.ArgumentHidingLocalVariable:
						case IProblem.ArgumentHidingField:
							return true;
					}
				}
			}
		}
		return false;
	}

	public static ASTNode getCopyOfInner(ASTRewrite rewrite, ASTNode statement, boolean toControlStatementBody) {
		if (statement.getNodeType() == ASTNode.BLOCK) {
			Block block= (Block) statement;
			List<Statement> innerStatements= block.statements();
			int nStatements= innerStatements.size();
			if (nStatements == 1) {
				return rewrite.createCopyTarget(innerStatements.get(0));
			} else if (nStatements > 1) {
				if (toControlStatementBody) {
					return rewrite.createCopyTarget(block);
				}
				ListRewrite listRewrite= rewrite.getListRewrite(block, Block.STATEMENTS_PROPERTY);
				ASTNode first= innerStatements.get(0);
				ASTNode last= innerStatements.get(nStatements - 1);
				return listRewrite.createCopyTarget(first, last);
			}
			return null;
		} else {
			return rewrite.createCopyTarget(statement);
		}
	}


	private static boolean getUnWrapProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		ASTNode outer= node;

		Block block= null;
		if (outer.getNodeType() == ASTNode.BLOCK) {
			block= (Block) outer;
			outer= block.getParent();
		}

		ASTNode body= null;
		String label= null;
		if (outer instanceof IfStatement) {
			IfStatement ifStatement= (IfStatement) outer;
			Statement elseBlock= ifStatement.getElseStatement();
			if (elseBlock == null || elseBlock instanceof Block && ((Block) elseBlock).statements().isEmpty()) {
				body= ifStatement.getThenStatement();
			}
			label= CorrectionMessages.QuickAssistProcessor_unwrap_ifstatement;
		} else if (outer instanceof WhileStatement) {
			body=((WhileStatement) outer).getBody();
			label= CorrectionMessages.QuickAssistProcessor_unwrap_whilestatement;
		} else if (outer instanceof ForStatement) {
			body=((ForStatement) outer).getBody();
			label= CorrectionMessages.QuickAssistProcessor_unwrap_forstatement;
		} else if (outer instanceof EnhancedForStatement) {
			body=((EnhancedForStatement) outer).getBody();
			label= CorrectionMessages.QuickAssistProcessor_unwrap_forstatement;
		} else if (outer instanceof SynchronizedStatement) {
			body=((SynchronizedStatement) outer).getBody();
			label= CorrectionMessages.QuickAssistProcessor_unwrap_synchronizedstatement;
		} else if (outer instanceof SimpleName && outer.getParent() instanceof LabeledStatement) {
			body=((LabeledStatement) outer.getParent()).getBody();
			label= CorrectionMessages.QuickAssistProcessor_unwrap_labeledstatement;
		} else if (outer instanceof LabeledStatement) {
			body=((LabeledStatement) outer).getBody();
			label= CorrectionMessages.QuickAssistProcessor_unwrap_labeledstatement;
		} else if (outer instanceof DoStatement) {
			body=((DoStatement) outer).getBody();
			label= CorrectionMessages.QuickAssistProcessor_unwrap_dostatement;
		} else if (outer instanceof TryStatement) {
			TryStatement tryStatement= (TryStatement) outer;
			if (tryStatement.catchClauses().isEmpty() && (tryStatement.getAST().apiLevel() >= AST.JLS4 && tryStatement.resources().isEmpty())) {
				body= tryStatement.getBody();
			}
			label= CorrectionMessages.QuickAssistProcessor_unwrap_trystatement;
		} else if (outer instanceof AnonymousClassDeclaration) {
			List<BodyDeclaration> decls= ((AnonymousClassDeclaration) outer).bodyDeclarations();
			for (int i= 0; i < decls.size(); i++) {
				BodyDeclaration elem= decls.get(i);
				if (elem instanceof MethodDeclaration) {
					Block curr= ((MethodDeclaration) elem).getBody();
					if (curr != null && !curr.statements().isEmpty()) {
						if (body != null) {
							return false;
						}
						body= curr;
					}
				} else if (elem instanceof TypeDeclaration) {
					return false;
				}
			}
			label= CorrectionMessages.QuickAssistProcessor_unwrap_anonymous;
			outer= ASTResolving.findParentStatement(outer);
			if (outer == null) {
				return false; // private Object o= new Object() { ... };
			}
		} else if (outer instanceof Block) {
			//	-> a block in a block
			body= block;
			outer= block;
			label= CorrectionMessages.QuickAssistProcessor_unwrap_block;
		} else if (outer instanceof ParenthesizedExpression) {
			//ParenthesizedExpression expression= (ParenthesizedExpression) outer;
			//body= expression.getExpression();
			//label= CorrectionMessages.getString("QuickAssistProcessor.unwrap.parenthesis");	 //$NON-NLS-1$
		} else if (outer instanceof MethodInvocation) {
			MethodInvocation invocation= (MethodInvocation) outer;
			if (invocation.arguments().size() == 1) {
				body= (ASTNode) invocation.arguments().get(0);
				if (invocation.getParent().getNodeType() == ASTNode.EXPRESSION_STATEMENT) {
					int kind= body.getNodeType();
					if (kind != ASTNode.ASSIGNMENT && kind != ASTNode.PREFIX_EXPRESSION && kind != ASTNode.POSTFIX_EXPRESSION
							&& kind != ASTNode.METHOD_INVOCATION && kind != ASTNode.SUPER_METHOD_INVOCATION) {
						body= null;
					}
				}
				label= CorrectionMessages.QuickAssistProcessor_unwrap_methodinvocation;
			}
		}
		if (body == null) {
			return false;
		}
		ASTRewrite rewrite= ASTRewrite.create(outer.getAST());
		ASTNode inner= getCopyOfInner(rewrite, body, ASTNodes.isControlStatementBody(outer.getLocationInParent()));
		if (inner == null) {
			return false;
		}
		if (resultingCollections == null) {
			return true;
		}

		rewrite.replace(outer, inner, null);
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_OBJS_EXCEPTION);
		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 1, image);
		resultingCollections.add(proposal);
		return true;
	}

	private static boolean isControlStatementWithBlock(ASTNode node) {
		switch (node.getNodeType()) {
			case ASTNode.IF_STATEMENT:
			case ASTNode.WHILE_STATEMENT:
			case ASTNode.FOR_STATEMENT:
			case ASTNode.DO_STATEMENT:
				return true;
			default:
				return false;
		}
	}

	private static boolean getRemoveBlockProposals(IInvocationContext context, ASTNode coveringNode, Collection<ICommandAccess> resultingCollections) {
		IProposableFix[] fixes= ControlStatementsFix.createRemoveBlockFix(context.getASTRoot(), coveringNode);
		if (fixes != null) {
			if (resultingCollections == null) {
				return true;
			}
			Map<String, String> options= new Hashtable<String, String>();
			options.put(CleanUpConstants.CONTROL_STATEMENTS_USE_BLOCKS, CleanUpOptions.TRUE);
			options.put(CleanUpConstants.CONTROL_STATMENTS_USE_BLOCKS_NEVER, CleanUpOptions.TRUE);
			ICleanUp cleanUp= new ControlStatementsCleanUp(options);
			for (int i= 0; i < fixes.length; i++) {
				IProposableFix fix= fixes[i];
				Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
				FixCorrectionProposal proposal= new FixCorrectionProposal(fix, cleanUp, 0, image, context);
				resultingCollections.add(proposal);
			}
			return true;
		}
		return false;
	}

	private static boolean getAddBlockProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		if (!(node instanceof Statement)) {
			return false;
		}

		/*
		 * only show the quick assist when the selection is of the control statement keywords (if, else, while,...)
		 * but not inside the statement or the if expression.
		 */
		if (!isControlStatementWithBlock(node) && isControlStatementWithBlock(node.getParent())) {
			int statementStart= node.getStartPosition();
			int statementEnd= statementStart + node.getLength();

			int offset= context.getSelectionOffset();
			int length= context.getSelectionLength();
			if (length == 0) {
				if (offset != statementEnd) { // cursor at end
					return false;
				}
			} else {
				if (offset > statementStart || offset + length < statementEnd) { // statement selected
					return false;
				}
			}
			node= node.getParent();
		}

		StructuralPropertyDescriptor childProperty= null;
		ASTNode child= null;
		switch (node.getNodeType()) {
			case ASTNode.IF_STATEMENT:
				ASTNode then= ((IfStatement) node).getThenStatement();
				ASTNode elseStatement= ((IfStatement) node).getElseStatement();
				if ((then instanceof Block) && (elseStatement instanceof Block || elseStatement == null)) {
					break;
				}
				int thenEnd= then.getStartPosition() + then.getLength();
				int selectionEnd= context.getSelectionOffset() + context.getSelectionLength();
				if (!(then instanceof Block)) {
					if (selectionEnd <= thenEnd) {
						childProperty= IfStatement.THEN_STATEMENT_PROPERTY;
						child= then;
						break;
					} else if (elseStatement != null && selectionEnd < elseStatement.getStartPosition()) {
						// find out if we are before or after the 'else' keyword
						try {
							TokenScanner scanner= new TokenScanner(context.getCompilationUnit());
							int elseTokenStart= scanner.getNextStartOffset(thenEnd, true);
							if (selectionEnd < elseTokenStart) {
								childProperty= IfStatement.THEN_STATEMENT_PROPERTY;
								child= then;
								break;
							}
						} catch (CoreException e) {
							// ignore
						}
					}
				}
				if (elseStatement != null && !(elseStatement instanceof Block) && context.getSelectionOffset() >= thenEnd) {
					childProperty= IfStatement.ELSE_STATEMENT_PROPERTY;
					child= elseStatement;
				}
				break;
			case ASTNode.WHILE_STATEMENT:
				ASTNode whileBody= ((WhileStatement) node).getBody();
				if (!(whileBody instanceof Block)) {
					childProperty= WhileStatement.BODY_PROPERTY;
					child= whileBody;
				}
				break;
			case ASTNode.FOR_STATEMENT:
				ASTNode forBody= ((ForStatement) node).getBody();
				if (!(forBody instanceof Block)) {
					childProperty= ForStatement.BODY_PROPERTY;
					child= forBody;
				}
				break;
			case ASTNode.DO_STATEMENT:
				ASTNode doBody= ((DoStatement) node).getBody();
				if (!(doBody instanceof Block)) {
					childProperty= DoStatement.BODY_PROPERTY;
					child= doBody;
				}
				break;
			default:
		}
		if (child == null) {
			return false;
		}

		if (resultingCollections == null) {
			return true;
		}
		AST ast= node.getAST();
		{
			ASTRewrite rewrite= ASTRewrite.create(ast);

			ASTNode childPlaceholder= rewrite.createMoveTarget(child);
			Block replacingBody= ast.newBlock();
			replacingBody.statements().add(childPlaceholder);
			rewrite.set(node, childProperty, replacingBody, null);

			String label;
			if (childProperty == IfStatement.THEN_STATEMENT_PROPERTY) {
				label = CorrectionMessages.QuickAssistProcessor_replacethenwithblock_description;
			} else if (childProperty == IfStatement.ELSE_STATEMENT_PROPERTY) {
				label = CorrectionMessages.QuickAssistProcessor_replaceelsewithblock_description;
			} else {
				label = CorrectionMessages.QuickAssistProcessor_replacebodywithblock_description;
			}

			Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
			LinkedCorrectionProposal proposal= new LinkedCorrectionProposal(label, context.getCompilationUnit(), rewrite, 5, image);
			proposal.setCommandId(ADD_BLOCK_ID);
			proposal.setEndPosition(rewrite.track(child));
			resultingCollections.add(proposal);
		}

		if (node.getNodeType() == ASTNode.IF_STATEMENT) {
			ASTRewrite rewrite= ASTRewrite.create(ast);

			while (node.getLocationInParent() == IfStatement.ELSE_STATEMENT_PROPERTY) {
				node= node.getParent();
			}

			boolean missingBlockFound= false;
			boolean foundElse= false;

			IfStatement ifStatement;
			Statement thenStatment;
			Statement elseStatment;
			do {
				ifStatement= (IfStatement) node;
				thenStatment= ifStatement.getThenStatement();
				elseStatment= ifStatement.getElseStatement();

				if (!(thenStatment instanceof Block)) {
					ASTNode childPlaceholder1= rewrite.createMoveTarget(thenStatment);
					Block replacingBody1= ast.newBlock();
					replacingBody1.statements().add(childPlaceholder1);
					rewrite.set(ifStatement, IfStatement.THEN_STATEMENT_PROPERTY, replacingBody1, null);
					if (thenStatment != child) {
						missingBlockFound= true;
					}
				}
				if (elseStatment != null) {
					foundElse= true;
				}
				node= elseStatment;
			} while (elseStatment instanceof IfStatement);

			if (elseStatment != null && !(elseStatment instanceof Block)) {
				ASTNode childPlaceholder2= rewrite.createMoveTarget(elseStatment);

				Block replacingBody2= ast.newBlock();
				replacingBody2.statements().add(childPlaceholder2);
				rewrite.set(ifStatement, IfStatement.ELSE_STATEMENT_PROPERTY, replacingBody2, null);
				if (elseStatment != child) {
					missingBlockFound= true;
				}
			}

			if (missingBlockFound && foundElse) {
				String label = CorrectionMessages.QuickAssistProcessor_replacethenelsewithblock_description;
				Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
				ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, 6, image);
				resultingCollections.add(proposal);
			}
		}
		return true;
	}

	private static boolean getInvertEqualsProposal(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		if (!(node instanceof MethodInvocation)) {
			node= node.getParent();
			if (!(node instanceof MethodInvocation)) {
				return false;
			}
		}
		MethodInvocation method= (MethodInvocation) node;
		String identifier= method.getName().getIdentifier();
		if (!"equals".equals(identifier) && !"equalsIgnoreCase".equals(identifier)) { //$NON-NLS-1$ //$NON-NLS-2$
			return false;
		}
		List<Expression> arguments= method.arguments();
		if (arguments.size() != 1) { //overloaded equals w/ more than 1 argument
			return false;
		}
		Expression right= arguments.get(0);
		ITypeBinding binding = right.resolveTypeBinding();
		if (binding != null && !(binding.isClass() || binding.isInterface())) { //overloaded equals w/ non-class/interface argument or null
			return false;
		}
		if (resultingCollections == null) {
			return true;
		}

		Expression left= method.getExpression();

		AST ast= method.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);
		if (left == null) { // equals(x) -> x.equals(this)
			MethodInvocation replacement= ast.newMethodInvocation();
			replacement.setName((SimpleName) rewrite.createCopyTarget(method.getName()));
			replacement.arguments().add(ast.newThisExpression());
			replacement.setExpression((Expression) rewrite.createCopyTarget(right));
			rewrite.replace(method, replacement, null);
		} else if (right instanceof ThisExpression) { // x.equals(this) -> equals(x)
			MethodInvocation replacement= ast.newMethodInvocation();
			replacement.setName((SimpleName) rewrite.createCopyTarget(method.getName()));
			replacement.arguments().add(rewrite.createCopyTarget(left));
			rewrite.replace(method, replacement, null);
		} else {
			ASTNode leftExpression= left;
			while (leftExpression instanceof ParenthesizedExpression) {
				leftExpression= ((ParenthesizedExpression) left).getExpression();
			}
			rewrite.replace(right, rewrite.createCopyTarget(leftExpression), null);

			if (right instanceof CastExpression
				|| right instanceof Assignment
				|| right instanceof ConditionalExpression
				|| right instanceof InfixExpression) {
				ParenthesizedExpression paren= ast.newParenthesizedExpression();
				paren.setExpression((Expression) rewrite.createCopyTarget(right));
				rewrite.replace(left, paren, null);
			} else {
				rewrite.replace(left, rewrite.createCopyTarget(right), null);
			}
		}

		String label= CorrectionMessages.QuickAssistProcessor_invertequals_description;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);

		LinkedCorrectionProposal proposal= new LinkedCorrectionProposal(label, context.getCompilationUnit(), rewrite, 1, image);
		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getArrayInitializerToArrayCreation(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		if (!(node instanceof ArrayInitializer)) {
			return false;
		}
		ArrayInitializer initializer= (ArrayInitializer) node;

		ASTNode parent= initializer.getParent();
		while (parent instanceof ArrayInitializer) {
			initializer= (ArrayInitializer) parent;
			parent= parent.getParent();
		}
		ITypeBinding typeBinding= initializer.resolveTypeBinding();
		if (!(parent instanceof VariableDeclaration) || typeBinding == null || !typeBinding.isArray()) {
			return false;
		}
		if (resultingCollections == null) {
			return true;
		}

		AST ast= node.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);

		String label= CorrectionMessages.QuickAssistProcessor_typetoarrayInitializer_description;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);

		LinkedCorrectionProposal proposal= new LinkedCorrectionProposal(label, context.getCompilationUnit(), rewrite, 1, image);

		ImportRewrite imports= proposal.createImportRewrite(context.getASTRoot());
		ImportRewriteContext importRewriteContext= new ContextSensitiveImportRewriteContext(node, imports);
		String typeName= imports.addImport(typeBinding, importRewriteContext);

		ArrayCreation creation= ast.newArrayCreation();
		creation.setInitializer((ArrayInitializer) rewrite.createMoveTarget(initializer));
		creation.setType((ArrayType) ASTNodeFactory.newType(ast, typeName));

		rewrite.replace(initializer, creation, null);

		resultingCollections.add(proposal);
		return true;
	}


	public static boolean getCreateInSuperClassProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) throws CoreException {
		if (!(node instanceof SimpleName) || !(node.getParent() instanceof MethodDeclaration)) {
			return false;
		}
		MethodDeclaration decl= (MethodDeclaration) node.getParent();
		if (decl.getName() != node || decl.resolveBinding() == null || Modifier.isPrivate(decl.getModifiers())) {
			return false;
		}

		ICompilationUnit cu= context.getCompilationUnit();
		CompilationUnit astRoot= context.getASTRoot();

		IMethodBinding binding= decl.resolveBinding();
		ITypeBinding[] paramTypes= binding.getParameterTypes();

		ITypeBinding[] superTypes= Bindings.getAllSuperTypes(binding.getDeclaringClass());
		if (resultingCollections == null) {
			for (int i= 0; i < superTypes.length; i++) {
				ITypeBinding curr= superTypes[i];
				if (curr.isFromSource() && Bindings.findOverriddenMethodInType(curr, binding) == null) {
					return true;
				}
			}
			return false;
		}
		List<SingleVariableDeclaration> params= decl.parameters();
		String[] paramNames= new String[paramTypes.length];
		for (int i = 0; i < params.size(); i++) {
			SingleVariableDeclaration param= params.get(i);
			paramNames[i]= param.getName().getIdentifier();
		}

		for (int i= 0; i < superTypes.length; i++) {
			ITypeBinding curr= superTypes[i];
			if (curr.isFromSource()) {
				IMethodBinding method= Bindings.findOverriddenMethodInType(curr, binding);
				if (method == null) {
					ITypeBinding typeDecl= curr.getTypeDeclaration();
					ICompilationUnit targetCU= ASTResolving.findCompilationUnitForBinding(cu, astRoot, typeDecl);
					if (targetCU != null) {
						String label= Messages.format(CorrectionMessages.QuickAssistProcessor_createmethodinsuper_description, new String[] { BasicElementLabels.getJavaElementName(curr.getName()), BasicElementLabels.getJavaElementName(binding.getName()) });
						resultingCollections.add(new NewDefiningMethodProposal(label, targetCU, astRoot, typeDecl, binding, paramNames, 6));
					}
				}
			}
		}
		return true;
	}

	private static boolean getConvertForLoopProposal(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		ForStatement forStatement= getEnclosingForStatementHeader(node);
		if (forStatement == null)
			return false;

		if (resultingCollections == null)
			return true;

		IProposableFix fix= ConvertLoopFix.createConvertForLoopToEnhancedFix(context.getASTRoot(), forStatement);
		if (fix == null)
			return false;

		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
		Map<String, String> options= new HashMap<String, String>();
		options.put(CleanUpConstants.CONTROL_STATMENTS_CONVERT_FOR_LOOP_TO_ENHANCED, CleanUpOptions.TRUE);
		ICleanUp cleanUp= new ConvertLoopCleanUp(options);
		FixCorrectionProposal proposal= new FixCorrectionProposal(fix, cleanUp, 1, image, context);
		proposal.setCommandId(CONVERT_FOR_LOOP_ID);

		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getConvertIterableLoopProposal(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
		ForStatement forStatement= getEnclosingForStatementHeader(node);
		if (forStatement == null)
			return false;

		if (resultingCollections == null)
			return true;

		IProposableFix fix= ConvertLoopFix.createConvertIterableLoopToEnhancedFix(context.getASTRoot(), forStatement);
		if (fix == null)
			return false;

		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
		Map<String, String> options= new HashMap<String, String>();
		options.put(CleanUpConstants.CONTROL_STATMENTS_CONVERT_FOR_LOOP_TO_ENHANCED, CleanUpOptions.TRUE);
		ICleanUp cleanUp= new ConvertLoopCleanUp(options);
		FixCorrectionProposal proposal= new FixCorrectionProposal(fix, cleanUp, 1, image, context);
		proposal.setCommandId(CONVERT_FOR_LOOP_ID);

		resultingCollections.add(proposal);
		return true;
	}

	private static ForStatement getEnclosingForStatementHeader(ASTNode node) {
		if (node instanceof ForStatement)
			return (ForStatement) node;

		while (node != null) {
			ASTNode parent= node.getParent();
			if (parent instanceof ForStatement) {
				StructuralPropertyDescriptor locationInParent= node.getLocationInParent();
				if (locationInParent == ForStatement.EXPRESSION_PROPERTY
						|| locationInParent == ForStatement.INITIALIZERS_PROPERTY
						|| locationInParent == ForStatement.UPDATERS_PROPERTY)
					return (ForStatement) parent;
				else
					return null;
			}
			node= parent;
		}
		return null;
	}

	private static boolean getMakeVariableDeclarationFinalProposals(IInvocationContext context, Collection<ICommandAccess> resultingCollections) {
		SelectionAnalyzer analyzer= new SelectionAnalyzer(Selection.createFromStartLength(context.getSelectionOffset(), context.getSelectionLength()), false);
		context.getASTRoot().accept(analyzer);
		ASTNode[] selectedNodes= analyzer.getSelectedNodes();
		if (selectedNodes.length == 0)
			return false;

		IProposableFix fix= VariableDeclarationFix.createChangeModifierToFinalFix(context.getASTRoot(), selectedNodes);
		if (fix == null)
			return false;

		if (resultingCollections == null)
			return true;

		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
		Map<String, String> options= new Hashtable<String, String>();
		options.put(CleanUpConstants.VARIABLE_DECLARATIONS_USE_FINAL, CleanUpOptions.TRUE);
		options.put(CleanUpConstants.VARIABLE_DECLARATIONS_USE_FINAL_LOCAL_VARIABLES, CleanUpOptions.TRUE);
		options.put(CleanUpConstants.VARIABLE_DECLARATIONS_USE_FINAL_PARAMETERS, CleanUpOptions.TRUE);
		options.put(CleanUpConstants.VARIABLE_DECLARATIONS_USE_FINAL_PRIVATE_FIELDS, CleanUpOptions.TRUE);
		VariableDeclarationCleanUp cleanUp= new VariableDeclarationCleanUp(options);
		FixCorrectionProposal proposal= new FixCorrectionProposal(fix, cleanUp, 5, image, context);
		resultingCollections.add(proposal);
		return true;
	}

	private static boolean getInlineLocalProposal(IInvocationContext context, final ASTNode node, Collection<ICommandAccess> proposals) throws CoreException {
		if (!(node instanceof SimpleName))
			return false;

		SimpleName name= (SimpleName) node;
		IBinding binding= name.resolveBinding();
		if (!(binding instanceof IVariableBinding))
			return false;
		IVariableBinding varBinding= (IVariableBinding) binding;
		if (varBinding.isField() || varBinding.isParameter())
			return false;
		ASTNode decl= context.getASTRoot().findDeclaringNode(varBinding);
		if (!(decl instanceof VariableDeclarationFragment) || decl.getLocationInParent() != VariableDeclarationStatement.FRAGMENTS_PROPERTY)
			return false;

		if (proposals == null) {
			return true;
		}

		InlineTempRefactoring refactoring= new InlineTempRefactoring((VariableDeclaration) decl);
		if (refactoring.checkInitialConditions(new NullProgressMonitor()).isOK()) {
			String label= CorrectionMessages.QuickAssistProcessor_inline_local_description;
			Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
			RefactoringCorrectionProposal proposal= new RefactoringCorrectionProposal(label, context.getCompilationUnit(), refactoring, 5, image);
			proposal.setCommandId(INLINE_LOCAL_ID);
			proposals.add(proposal);

		}
		return true;
	}

	private static boolean getMissingCaseStatementProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> proposals) {
		if (node instanceof SwitchCase) {
			node= node.getParent();
		}
		if (!(node instanceof SwitchStatement))
			return false;

		SwitchStatement switchStatement= (SwitchStatement)node;
		ITypeBinding expressionBinding= switchStatement.getExpression().resolveTypeBinding();
		if (expressionBinding == null || !expressionBinding.isEnum())
			return false;

		String[] missingEnumCases= LocalCorrectionsSubProcessor.evaluateMissingEnumConstantCases(expressionBinding, switchStatement.statements());
		if (missingEnumCases.length == 0)
			return false;

		if (proposals == null)
			return true;

		proposals.add(LocalCorrectionsSubProcessor.createMissingEnumConstantCaseProposals(context, switchStatement, missingEnumCases));
		return true;
	}


	private static boolean getConvertLocalToFieldProposal(IInvocationContext context, final ASTNode node, Collection<ICommandAccess> proposals) throws CoreException {
		if (!(node instanceof SimpleName))
			return false;

		SimpleName name= (SimpleName) node;
		IBinding binding= name.resolveBinding();
		if (!(binding instanceof IVariableBinding) || name.getLocationInParent() != VariableDeclarationFragment.NAME_PROPERTY)
			return false;
		IVariableBinding varBinding= (IVariableBinding) binding;
		if (varBinding.isField() || varBinding.isParameter())
			return false;
		VariableDeclarationFragment decl= (VariableDeclarationFragment) name.getParent();
		if (decl.getLocationInParent() != VariableDeclarationStatement.FRAGMENTS_PROPERTY)
			return false;

		if (proposals == null) {
			return true;
		}

		PromoteTempToFieldRefactoring refactoring= new PromoteTempToFieldRefactoring(decl);
		if (refactoring.checkInitialConditions(new NullProgressMonitor()).isOK()) {
			String label= CorrectionMessages.QuickAssistProcessor_convert_local_to_field_description;
			Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
			LinkedProposalModel linkedProposalModel= new LinkedProposalModel();
			refactoring.setLinkedProposalModel(linkedProposalModel);

			RefactoringCorrectionProposal proposal= new RefactoringCorrectionProposal(label, context.getCompilationUnit(), refactoring, 5, image);
			proposal.setLinkedProposalModel(linkedProposalModel);
			proposal.setCommandId(CONVERT_LOCAL_TO_FIELD_ID);
			proposals.add(proposal);
		}
		return true;
	}

	private static class RefactoringCorrectionProposal extends CUCorrectionProposal {
		private final Refactoring fRefactoring;
		private RefactoringStatus fRefactoringStatus;

		public RefactoringCorrectionProposal(String name, ICompilationUnit cu, Refactoring refactoring, int relevance, Image image) {
			super(name, cu, null, relevance, image);
			fRefactoring= refactoring;
		}

		/**
		 * Can be overridden by clients to perform expensive initializations of the refactoring
		 * 
		 * @param refactoring the refactoring
		 * @throws CoreException if something goes wrong during init
		 */
		protected void init(Refactoring refactoring) throws CoreException {
			// empty default implementation
		}

		@Override
		protected TextChange createTextChange() throws CoreException {
			init(fRefactoring);
			fRefactoringStatus= fRefactoring.checkFinalConditions(new NullProgressMonitor());
			if (fRefactoringStatus.hasFatalError()) {
				TextFileChange dummyChange= new TextFileChange("fatal error", (IFile) getCompilationUnit().getResource()); //$NON-NLS-1$
				dummyChange.setEdit(new InsertEdit(0, "")); //$NON-NLS-1$
				return dummyChange;
			}
			return (TextChange) fRefactoring.createChange(new NullProgressMonitor());
		}
		
		/*
		 * @see org.eclipse.jdt.internal.ui.text.correction.proposals.CUCorrectionProposal#getAdditionalProposalInfo(org.eclipse.core.runtime.IProgressMonitor)
		 * @since 3.6
		 */
		@Override
		public Object getAdditionalProposalInfo(IProgressMonitor monitor) {
			if (fRefactoringStatus != null && fRefactoringStatus.hasFatalError()) {
				return fRefactoringStatus.getEntryWithHighestSeverity().getMessage();
			}
			return super.getAdditionalProposalInfo(monitor);
		}
	}
}