/*******************************************************************************
 * Copyright (c) 2006 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
 *******************************************************************************/
package org.eclipse.jdt.internal.corext.refactoring.code;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.text.edits.MalformedTreeException;
import org.eclipse.text.edits.MultiTextEdit;
import org.eclipse.text.edits.TextEdit;
import org.eclipse.text.edits.TextEditGroup;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.SubProgressMonitor;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;

import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.RefactoringDescriptor;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.ltk.core.refactoring.participants.RefactoringArguments;
import org.eclipse.ltk.core.refactoring.participants.ResourceChangeChecker;

import org.eclipse.jdt.core.Flags;
import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.ITypeHierarchy;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTParser;
import org.eclipse.jdt.core.dom.Block;
import org.eclipse.jdt.core.dom.BodyDeclaration;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.ExpressionStatement;
import org.eclipse.jdt.core.dom.IBinding;
import org.eclipse.jdt.core.dom.IMethodBinding;
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.SimpleName;
import org.eclipse.jdt.core.dom.SingleVariableDeclaration;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.jdt.core.dom.rewrite.ImportRewrite;

import org.eclipse.jdt.internal.corext.dom.NodeFinder;
import org.eclipse.jdt.internal.corext.refactoring.Checks;
import org.eclipse.jdt.internal.corext.refactoring.JavaRefactoringArguments;
import org.eclipse.jdt.internal.corext.refactoring.JavaRefactoringDescriptor;
import org.eclipse.jdt.internal.corext.refactoring.JavaRefactoringDescriptorComment;
import org.eclipse.jdt.internal.corext.refactoring.RefactoringCoreMessages;
import org.eclipse.jdt.internal.corext.refactoring.base.JavaStatusContext;
import org.eclipse.jdt.internal.corext.refactoring.binary.StubCreator;
import org.eclipse.jdt.internal.corext.refactoring.changes.CompilationUnitChange;
import org.eclipse.jdt.internal.corext.refactoring.changes.DynamicValidationRefactoringChange;
import org.eclipse.jdt.internal.corext.refactoring.util.RefactoringASTParser;
import org.eclipse.jdt.internal.corext.refactoring.util.TextChangeManager;
import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
import org.eclipse.jdt.internal.corext.util.Messages;

import org.eclipse.jdt.ui.JavaElementLabels;

import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.viewsupport.BindingLabelProvider;

public class ReplaceInvocationsRefactoring extends ScriptableRefactoring {

	private static final String ID_REPLACE_INVOCATIONS= "org.eclipse.jdt.ui.replace.invocations"; //$NON-NLS-1$
	private static final String ATTRIBUTE_MODE= "mode"; //$NON-NLS-1$

	public static class Mode {
		private Mode() {
		}
		public static final Mode REPLACE_ALL= new Mode();
		public static final Mode REPLACE_SINGLE= new Mode();
	}

	/**
	 * ICompilationUnit or IClassFile
	 */
	private final IJavaElement fSelectionUnit;
	/**
	 * only set if initial mode is REPLACE_SINGLE
	 */
	private final int fSelectionStart;
	/**
	 * only set if initial mode is REPLACE_SINGLE
	 */
	private final int fSelectionLength;
	
	private ASTNode fSelectionNode;
	/**
	 * only set after checkInitialConditions
	 */
	private IMethod fMethod;
	
	private String fBody;
	private String[] fParameterNames;
	
	private SourceProvider fSourceProvider; // resolved once in checkInitialConditions
	private TargetProvider fTargetProvider; // flexible
	
	private TextChangeManager fChangeManager;
	private IMethodBinding fMethodBinding;
	
	public ReplaceInvocationsRefactoring(IJavaElement unit, int offset, int length) {
		if (! JavaModelUtil.isTypeContainerUnit(unit))
			throw new IllegalArgumentException(unit.toString());
		
		fSelectionUnit= unit;
		fSelectionStart= offset;
		fSelectionLength= length;
	}

	public ReplaceInvocationsRefactoring(IMethod method) {
		fMethod= method;
		fSelectionUnit= JavaModelUtil.getTypeContainerUnit(method);
		fSelectionStart= -1;
		fSelectionLength= -1;
	}
	
	public String getName() {
		return RefactoringCoreMessages.ReplaceInvocationsRefactoring_name;
	}
	
	/**
	 * Only to be called after {@link #checkInitialConditions(IProgressMonitor)}
	 */
	public boolean canReplaceSingle() {
		return fSelectionNode instanceof MethodInvocation;
	}
	
	/**
	 * Only to be called after {@link #checkInitialConditions(IProgressMonitor)}
	 */
	public RefactoringStatus setCurrentMode(Mode mode) throws JavaModelException {
		if (fTargetProvider.isSingle() == (mode == Mode.REPLACE_SINGLE))
			return new RefactoringStatus();
		Assert.isTrue(canReplaceSingle());
		if (mode == Mode.REPLACE_SINGLE) {
			fTargetProvider= TargetProvider.create((ICompilationUnit) fSelectionUnit, (MethodInvocation) fSelectionNode);
		} else {
			fTargetProvider= TargetProvider.create(fSourceProvider.getDeclaration());
		}
		return fTargetProvider.checkActivation();
	}
	
	public void setBody(String body, String[] parameterNames) {
		//TODO: validate parameter name count and body
		fBody= body;
		fParameterNames= parameterNames;
	}
	
	public RefactoringStatus checkInitialConditions(IProgressMonitor pm) throws CoreException {
		// TargetProvider must get an untampered AST with original invocation node
		// SourceProvider must get a tweaked AST with method body / parameter names replaced
		
		RefactoringStatus result= new RefactoringStatus();
		
		if (fMethod == null) {
			if (! (fSelectionUnit instanceof ICompilationUnit))
				return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.ReplaceInvocationsRefactoring_cannot_replace_in_binary);
			
			ICompilationUnit cu= (ICompilationUnit) fSelectionUnit;
			CompilationUnit root= new RefactoringASTParser(AST.JLS3).parse(cu, true);
			fSelectionNode= getTargetNode(cu, root, fSelectionStart, fSelectionLength);
			if (fSelectionNode == null)
				return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.ReplaceInvocationsRefactoring_select_method_to_apply);
			
			if (fSelectionNode.getNodeType() == ASTNode.METHOD_DECLARATION) {
				MethodDeclaration methodDeclaration= (MethodDeclaration) fSelectionNode;
				fTargetProvider= TargetProvider.create(methodDeclaration);
				fMethodBinding= methodDeclaration.resolveBinding();
			} else {
				MethodInvocation methodInvocation= (MethodInvocation) fSelectionNode;
				fTargetProvider= TargetProvider.create(cu, methodInvocation);
				fMethodBinding= methodInvocation.resolveMethodBinding();
			}
			if (fMethodBinding == null)
				return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.InlineMethodRefactoring_error_noMethodDeclaration);
			fMethod= (IMethod) fMethodBinding.getJavaElement();
			
		} else {
			ASTParser parser= ASTParser.newParser(AST.JLS3);
			parser.setProject(fMethod.getJavaProject());
			IBinding[] bindings= parser.createBindings(new IJavaElement[] { fMethod }, null);
			fMethodBinding= (IMethodBinding) bindings[0];
			if (fMethodBinding == null)
				return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.InlineMethodRefactoring_error_noMethodDeclaration);
			
			fTargetProvider= TargetProvider.create(fMethodBinding);
		}
		
		result.merge(fTargetProvider.checkActivation());
		return result;
	}
	
	private SourceProvider resolveSourceProvider(IMethodBinding methodBinding, RefactoringStatus status) throws JavaModelException {
		final IMethod method= (IMethod) methodBinding.getJavaElement();
		
		IJavaElement unit;
		IDocument source;
		CompilationUnit methodDeclarationAstRoot;
		
		ICompilationUnit methodCu= (method).getCompilationUnit();
		if (methodCu != null) {
			unit= methodCu;
			ASTParser parser= ASTParser.newParser(AST.JLS3);
			parser.setSource(methodCu);
			parser.setFocalPosition(method.getNameRange().getOffset());
			CompilationUnit compilationUnit= (CompilationUnit) parser.createAST(null);
			MethodDeclaration methodDecl= (MethodDeclaration) NodeFinder.perform(compilationUnit, method.getNameRange()).getParent();
			AST ast= compilationUnit.getAST();
			ASTRewrite rewrite= ASTRewrite.create(ast);
			Block newBody= ast.newBlock();
			newBody.statements().add(rewrite.createStringPlaceholder(fBody, ASTNode.EMPTY_STATEMENT));
			rewrite.replace(methodDecl.getBody(), newBody, null);
			List parameters= methodDecl.parameters();
			for (int i= 0; i < parameters.size(); i++) {
				SingleVariableDeclaration parameter= (SingleVariableDeclaration) parameters.get(i);
				rewrite.set(parameter.getName(), SimpleName.IDENTIFIER_PROPERTY, fParameterNames[i], null);
			}
			TextEdit textEdit= rewrite.rewriteAST();
			Document document= new Document(methodCu.getBuffer().getContents());
			try {
				textEdit.apply(document);
			} catch (MalformedTreeException e) {
				JavaPlugin.log(e);
			} catch (BadLocationException e) {
				JavaPlugin.log(e);
			}
			source= document;
			
			methodDeclarationAstRoot= new RefactoringASTParser(AST.JLS3).parse(source.get(), methodCu, true, true, null);
			
		} else {
			IClassFile classFile= method.getClassFile();
			//TODO: use source if available?
			StubCreator stubCreator= new StubCreator(true) {
				protected void appendMethodBody(IMethod currentMethod) throws JavaModelException {
					if (currentMethod.equals(method)) {
						fBuffer.append(fBody);
					} else {
						super.appendMethodBody(currentMethod);
					}
				}
				/*
				 * @see org.eclipse.jdt.internal.corext.refactoring.binary.StubCreator#appendMethodParameterName(org.eclipse.jdt.core.IMethod, int)
				 */
				protected void appendMethodParameterName(IMethod currentMethod, int index) {
					if (currentMethod.equals(method)) {
						fBuffer.append(fParameterNames[index]);
					} else {
						super.appendMethodParameterName(currentMethod, index);
					}
				}
			};
			
			String stub= stubCreator.createStub(classFile.getType(), null);
			source= new Document(stub);
			methodDeclarationAstRoot= new RefactoringASTParser(AST.JLS3).parse(stub, classFile, true, true, null);
			unit= classFile;
		}
		ASTNode node= methodDeclarationAstRoot.findDeclaringNode(methodBinding.getKey());
		if (node instanceof MethodDeclaration) {
			return new SourceProvider(unit, source, (MethodDeclaration) node);
		} else {
			status.addFatalError(RefactoringCoreMessages.ReplaceInvocationsRefactoring_cannot_find_method_declaration);
			return null;
		}
	}
	
	/**
	 * @return an invocation or declaration node
	 */
	private static ASTNode getTargetNode(ICompilationUnit unit, CompilationUnit root, int offset, int length) {
		ASTNode node= null;
		try {
			node= checkNode(NodeFinder.perform(root, offset, length, unit), unit);
		} catch(JavaModelException e) {
			// Do nothing
		}
		if (node != null)
			return node;
		return checkNode(NodeFinder.perform(root, offset, length), unit);
	}

	private static ASTNode checkNode(ASTNode node, ICompilationUnit unit) {
		if (node == null)
			return null;
		if (node.getNodeType() == ASTNode.SIMPLE_NAME) {
			node= node.getParent();
		} else if (node.getNodeType() == ASTNode.EXPRESSION_STATEMENT) {
			node= ((ExpressionStatement)node).getExpression();
		}
		switch(node.getNodeType()) {
			case ASTNode.METHOD_DECLARATION:
			case ASTNode.METHOD_INVOCATION:
// not yet...
//			case ASTNode.SUPER_METHOD_INVOCATION:
//			case ASTNode.CONSTRUCTOR_INVOCATION:
				return node;
		}
		return null;
	}
	
	public RefactoringStatus checkFinalConditions(IProgressMonitor pm) throws CoreException {
		pm.beginTask("", 20); //$NON-NLS-1$
		fChangeManager= new TextChangeManager();
		RefactoringStatus result= new RefactoringStatus();
		
		fSourceProvider= resolveSourceProvider(fMethodBinding, result);
		if (result.hasFatalError())
			return result;
		
		result.merge(fSourceProvider.checkActivation());
		if (result.hasFatalError())
			return result;
		
		fSourceProvider.initialize();
		fTargetProvider.initialize();
		pm.setTaskName(RefactoringCoreMessages.InlineMethodRefactoring_searching);
		RefactoringStatus searchStatus= new RefactoringStatus();
		ICompilationUnit[] units= fTargetProvider.getAffectedCompilationUnits(searchStatus, new SubProgressMonitor(pm, 1));
		if (searchStatus.hasFatalError()) {
			result.merge(searchStatus);
			return result;
		}
		IFile[] filesToBeModified= getFilesToBeModified(units);
		result.merge(Checks.validateModifiesFiles(filesToBeModified, getValidationContext()));
		if (result.hasFatalError())
			return result;
		result.merge(ResourceChangeChecker.checkFilesToBeChanged(filesToBeModified, new SubProgressMonitor(pm, 1)));
		checkOverridden(result, new SubProgressMonitor(pm, 4));
		IProgressMonitor sub= new SubProgressMonitor(pm, 15);
		sub.beginTask("", units.length * 3); //$NON-NLS-1$
		for (int c= 0; c < units.length; c++) {
			ICompilationUnit unit= units[c];
			sub.subTask(Messages.format(RefactoringCoreMessages.InlineMethodRefactoring_processing,  unit.getElementName())); 
			CallInliner inliner= null;
			try {
				boolean added= false;
				MultiTextEdit root= new MultiTextEdit();
				CompilationUnitChange change= (CompilationUnitChange)fChangeManager.get(unit);
				change.setEdit(root);
				BodyDeclaration[] bodies= fTargetProvider.getAffectedBodyDeclarations(unit, new SubProgressMonitor(pm, 1));
				if (bodies.length == 0)
					continue;
				inliner= new CallInliner(unit, (CompilationUnit) bodies[0].getRoot(), fSourceProvider);
				for (int b= 0; b < bodies.length; b++) {
					BodyDeclaration body= bodies[b];
					inliner.initialize(body);
					RefactoringStatus nestedInvocations= new RefactoringStatus();
					ASTNode[] invocations= removeNestedCalls(nestedInvocations, unit, 
						fTargetProvider.getInvocations(body, new SubProgressMonitor(sub, 2)));
					for (int i= 0; i < invocations.length; i++) {
						ASTNode invocation= invocations[i];
						result.merge(inliner.initialize(invocation, fTargetProvider.getStatusSeverity()));
						if (result.hasFatalError())
							break;
						if (result.getSeverity() < fTargetProvider.getStatusSeverity()) {
							added= true;
							TextEditGroup group= new TextEditGroup(RefactoringCoreMessages.InlineMethodRefactoring_edit_inline); 
							change.addTextEditGroup(group);
							result.merge(inliner.perform(group)); 
						}
					}
					// do this after we have inlined the method calls. We still want
					// to generate the modifications.
					result.merge(nestedInvocations);
				}
				if (!added) {
					fChangeManager.remove(unit);
				} else {
					root.addChild(inliner.getModifications());
					ImportRewrite rewrite= inliner.getImportEdit();
					if (rewrite.hasRecordedChanges()) {
						TextEdit edit= rewrite.rewriteImports(null);
						if (edit instanceof MultiTextEdit ? ((MultiTextEdit)edit).getChildrenSize() > 0 : true) {
							root.addChild(edit);
							change.addTextEditGroup(
								new TextEditGroup(RefactoringCoreMessages.InlineMethodRefactoring_edit_import, new TextEdit[] {edit})); 
						}
					}
				}
			} finally {
				if (inliner != null)
					inliner.dispose();
			}
			sub.worked(1);
			if (sub.isCanceled())
				throw new OperationCanceledException();
		}
		result.merge(searchStatus);
		sub.done();
		pm.done();
		return result;
	}

	public Change createChange(IProgressMonitor pm) throws CoreException {
		// TODO: update for fSelectionStart == -1
		final Map arguments= new HashMap();
		String project= null;
		IJavaProject javaProject= fSelectionUnit.getJavaProject();
		if (javaProject != null)
			project= javaProject.getElementName();
		final IMethodBinding binding= fSourceProvider.getDeclaration().resolveBinding();
		int flags= RefactoringDescriptor.STRUCTURAL_CHANGE | JavaRefactoringDescriptor.JAR_REFACTORABLE | JavaRefactoringDescriptor.JAR_SOURCE_ATTACHMENT;
		if (!Modifier.isPrivate(binding.getModifiers()))
			flags|= RefactoringDescriptor.MULTI_CHANGE;
		final String description= Messages.format(RefactoringCoreMessages.ReplaceInvocationsRefactoring_descriptor_description_short, binding.getName());
		final String header= Messages.format(RefactoringCoreMessages.ReplaceInvocationsRefactoring_descriptor_description, new String[] { BindingLabelProvider.getBindingLabel(binding, JavaElementLabels.ALL_FULLY_QUALIFIED), BindingLabelProvider.getBindingLabel(binding.getDeclaringClass(), JavaElementLabels.ALL_FULLY_QUALIFIED)});
		final JavaRefactoringDescriptorComment comment= new JavaRefactoringDescriptorComment(this, header);
		comment.addSetting(Messages.format(RefactoringCoreMessages.ReplaceInvocationsRefactoring_original_pattern, BindingLabelProvider.getBindingLabel(binding, JavaElementLabels.ALL_FULLY_QUALIFIED)));
		if (!fTargetProvider.isSingle())
			comment.addSetting(RefactoringCoreMessages.ReplaceInvocationsRefactoring_replace_references);
		final JavaRefactoringDescriptor descriptor= new JavaRefactoringDescriptor(ID_REPLACE_INVOCATIONS, project, description, comment.asString(), arguments, flags);
		arguments.put(JavaRefactoringDescriptor.ATTRIBUTE_INPUT, descriptor.elementToHandle(fSelectionUnit));
		arguments.put(JavaRefactoringDescriptor.ATTRIBUTE_SELECTION, new Integer(fSelectionStart).toString() + " " + new Integer(fSelectionLength).toString()); //$NON-NLS-1$
		arguments.put(ATTRIBUTE_MODE, new Integer(fTargetProvider.isSingle() ? 0 : 1).toString());
		return new DynamicValidationRefactoringChange(descriptor, RefactoringCoreMessages.ReplaceInvocationsRefactoring_change_name, fChangeManager.getAllChanges());
	}
	
	private IFile[] getFilesToBeModified(ICompilationUnit[] units) {
		List result= new ArrayList(units.length + 1);
		IFile file;
		for (int i= 0; i < units.length; i++) {
			file= getFile(units[i]);
			if (file != null)
				result.add(file);
		}
		return (IFile[])result.toArray(new IFile[result.size()]);
	}
	
	private IFile getFile(ICompilationUnit unit) {
		unit= unit.getPrimary();
		IResource resource= unit.getResource();
		if (resource != null && resource.getType() == IResource.FILE)
			return (IFile)resource;
		return null;
	}
	
	private void checkOverridden(RefactoringStatus status, IProgressMonitor pm) throws JavaModelException {
		pm.beginTask("", 9); //$NON-NLS-1$
		pm.setTaskName(RefactoringCoreMessages.InlineMethodRefactoring_checking_overridden); 
		MethodDeclaration decl= fSourceProvider.getDeclaration();
		IMethod method= (IMethod) decl.resolveBinding().getJavaElement();
		if (method == null || Flags.isPrivate(method.getFlags())) {
			pm.worked(8);
			return;
		}
		IType type= method.getDeclaringType();
		ITypeHierarchy hierarchy= type.newTypeHierarchy(new SubProgressMonitor(pm, 6));
		checkSubTypes(status, method, hierarchy.getAllSubtypes(type), new SubProgressMonitor(pm, 1));
		checkSuperClasses(status, method, hierarchy.getAllSuperclasses(type), new SubProgressMonitor(pm, 1));
		checkSuperInterfaces(status, method, hierarchy.getAllSuperInterfaces(type), new SubProgressMonitor(pm, 1));
		pm.setTaskName(""); //$NON-NLS-1$
	}

	private void checkSubTypes(RefactoringStatus result, IMethod method, IType[] types, IProgressMonitor pm) {
		checkTypes(
			result, method, types, 
			RefactoringCoreMessages.InlineMethodRefactoring_checking_overridden_error,
			pm);
	}
	
	private void checkSuperClasses(RefactoringStatus result, IMethod method, IType[] types, IProgressMonitor pm) {
		checkTypes(
			result, method, types, 
			RefactoringCoreMessages.InlineMethodRefactoring_checking_overrides_error,
			pm);
	}

	private void checkSuperInterfaces(RefactoringStatus result, IMethod method, IType[] types, IProgressMonitor pm) {
		checkTypes(
			result, method, types, 
			RefactoringCoreMessages.InlineMethodRefactoring_checking_implements_error,
			pm);
	}
	private void checkTypes(RefactoringStatus result, IMethod method, IType[] types, String key, IProgressMonitor pm) {
		pm.beginTask("", types.length); //$NON-NLS-1$
		for (int i= 0; i < types.length; i++) {
			pm.worked(1);
			IMethod[] overridden= types[i].findMethods(method);
			if (overridden != null && overridden.length > 0) {
				result.addError(
					Messages.format(key, types[i].getElementName()), 
					JavaStatusContext.create(overridden[0]));
			}
		}
	}
	
	private ASTNode[] removeNestedCalls(RefactoringStatus status, ICompilationUnit unit, ASTNode[] invocations) {
		if (invocations.length <= 1)
			return invocations;
		ASTNode[] parents= new ASTNode[invocations.length];
		for (int i= 0; i < invocations.length; i++) {
			parents[i]= invocations[i].getParent();
		}
		for (int i= 0; i < invocations.length; i++) {
			removeNestedCalls(status, unit, parents, invocations, i);
		}
		List result= new ArrayList();
		for (int i= 0; i < invocations.length; i++) {
			if (invocations[i] != null)
				result.add(invocations[i]);
		}
		return (ASTNode[])result.toArray(new ASTNode[result.size()]);
	}
	
	private void removeNestedCalls(RefactoringStatus status, ICompilationUnit unit, ASTNode[] parents, ASTNode[] invocations, int index) {
		ASTNode invocation= invocations[index];
		for (int i= 0; i < parents.length; i++) {
			ASTNode parent= parents[i];
			while (parent != null) {
				if (parent == invocation) {
					status.addError(RefactoringCoreMessages.InlineMethodRefactoring_nestedInvocation,  
						JavaStatusContext.create(unit, parent));
					invocations[index]= null;
				}
				parent= parent.getParent();
			}
		}
	}

	public RefactoringStatus initialize(final RefactoringArguments arguments) {
		if (arguments instanceof JavaRefactoringArguments) {
			final JavaRefactoringArguments generic= (JavaRefactoringArguments) arguments;
			final String value= generic.getAttribute(ATTRIBUTE_MODE);
			if (value != null && !"".equals(value)) {//$NON-NLS-1$
				int mode= 0;
				try {
					mode= Integer.parseInt(value);
				} catch (NumberFormatException exception) {
					return RefactoringStatus.createFatalErrorStatus(Messages.format(RefactoringCoreMessages.InitializableRefactoring_argument_not_exist, ATTRIBUTE_MODE));
				}
				try {
					setCurrentMode(mode == 1 ? Mode.REPLACE_ALL : Mode.REPLACE_SINGLE);
				} catch (JavaModelException exception) {
					return RefactoringStatus.createFatalErrorStatus(exception.getLocalizedMessage());
				}
			}
		} else
			return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.InitializableRefactoring_inacceptable_arguments);
		return new RefactoringStatus();
	}

	public IMethod getMethod() {
		return fMethod;
	}

}