/*******************************************************************************
 * Copyright (c) 2000, 2018 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.corext.refactoring.rename;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;

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

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

import org.eclipse.text.edits.MalformedTreeException;
import org.eclipse.text.edits.ReplaceEdit;
import org.eclipse.text.edits.TextEdit;

import org.eclipse.jface.util.Util;

import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.CompositeChange;
import org.eclipse.ltk.core.refactoring.IResourceMapper;
import org.eclipse.ltk.core.refactoring.RefactoringDescriptor;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.ltk.core.refactoring.RefactoringStatusContext;
import org.eclipse.ltk.core.refactoring.participants.CheckConditionsContext;
import org.eclipse.ltk.core.refactoring.participants.RenameArguments;

import org.eclipse.jdt.core.Flags;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IImportDeclaration;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.IOrdinaryClassFile;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.Signature;
import org.eclipse.jdt.core.dom.rewrite.ImportRewrite;
import org.eclipse.jdt.core.refactoring.IJavaElementMapper;
import org.eclipse.jdt.core.refactoring.IJavaRefactorings;
import org.eclipse.jdt.core.refactoring.descriptors.JavaRefactoringDescriptor;
import org.eclipse.jdt.core.refactoring.descriptors.RenameJavaElementDescriptor;
import org.eclipse.jdt.core.search.IJavaSearchConstants;
import org.eclipse.jdt.core.search.IJavaSearchScope;
import org.eclipse.jdt.core.search.SearchEngine;
import org.eclipse.jdt.core.search.SearchMatch;
import org.eclipse.jdt.core.search.SearchPattern;
import org.eclipse.jdt.core.search.SearchRequestor;

import org.eclipse.jdt.internal.core.manipulation.StubUtility;
import org.eclipse.jdt.internal.core.manipulation.util.BasicElementLabels;
import org.eclipse.jdt.internal.core.refactoring.descriptors.RefactoringSignatureDescriptorFactory;
import org.eclipse.jdt.internal.corext.refactoring.Checks;
import org.eclipse.jdt.internal.corext.refactoring.CollectingSearchRequestor;
import org.eclipse.jdt.internal.corext.refactoring.CuCollectingSearchRequestor;
import org.eclipse.jdt.internal.corext.refactoring.JDTRefactoringDescriptorComment;
import org.eclipse.jdt.internal.corext.refactoring.JavaRefactoringArguments;
import org.eclipse.jdt.internal.corext.refactoring.JavaRefactoringDescriptorUtil;
import org.eclipse.jdt.internal.corext.refactoring.RefactoringAvailabilityTester;
import org.eclipse.jdt.internal.corext.refactoring.RefactoringCoreMessages;
import org.eclipse.jdt.internal.corext.refactoring.RefactoringScopeFactory;
import org.eclipse.jdt.internal.corext.refactoring.RefactoringSearchEngine;
import org.eclipse.jdt.internal.corext.refactoring.SearchResultGroup;
import org.eclipse.jdt.internal.corext.refactoring.base.ReferencesInBinaryContext;
import org.eclipse.jdt.internal.corext.refactoring.changes.DynamicValidationRefactoringChange;
import org.eclipse.jdt.internal.corext.refactoring.changes.RenamePackageChange;
import org.eclipse.jdt.internal.corext.refactoring.changes.TextChangeCompatibility;
import org.eclipse.jdt.internal.corext.refactoring.participants.JavaProcessors;
import org.eclipse.jdt.internal.corext.refactoring.rename.RenamePackageProcessor.ImportsManager.ImportChange;
import org.eclipse.jdt.internal.corext.refactoring.tagging.IQualifiedNameUpdating;
import org.eclipse.jdt.internal.corext.refactoring.tagging.IReferenceUpdating;
import org.eclipse.jdt.internal.corext.refactoring.tagging.ITextUpdating;
import org.eclipse.jdt.internal.corext.refactoring.util.Changes;
import org.eclipse.jdt.internal.corext.refactoring.util.CommentAnalyzer;
import org.eclipse.jdt.internal.corext.refactoring.util.JavaElementUtil;
import org.eclipse.jdt.internal.corext.refactoring.util.JavaStatusContext;
import org.eclipse.jdt.internal.corext.refactoring.util.QualifiedNameFinder;
import org.eclipse.jdt.internal.corext.refactoring.util.QualifiedNameSearchResult;
import org.eclipse.jdt.internal.corext.refactoring.util.ResourceUtil;
import org.eclipse.jdt.internal.corext.refactoring.util.TextChangeManager;
import org.eclipse.jdt.internal.corext.util.Messages;
import org.eclipse.jdt.internal.corext.util.Resources;
import org.eclipse.jdt.internal.corext.util.SearchUtils;

import org.eclipse.jdt.ui.JavaElementLabels;
import org.eclipse.jdt.ui.refactoring.RefactoringSaveHelper;

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

public class RenamePackageProcessor extends JavaRenameProcessor implements
		IReferenceUpdating, ITextUpdating, IQualifiedNameUpdating, IResourceMapper, IJavaElementMapper {

	private static final String ATTRIBUTE_QUALIFIED= "qualified"; //$NON-NLS-1$
	private static final String ATTRIBUTE_TEXTUAL_MATCHES= "textual"; //$NON-NLS-1$
	private static final String ATTRIBUTE_PATTERNS= "patterns"; //$NON-NLS-1$
	private static final String ATTRIBUTE_HIERARCHICAL= "hierarchical"; //$NON-NLS-1$

	private IPackageFragment fPackage;

	private TextChangeManager fChangeManager;
	private ImportsManager fImportsManager;
	private QualifiedNameSearchResult fQualifiedNameSearchResult;

	private boolean fUpdateReferences;
	private boolean fUpdateTextualMatches;
	private boolean fUpdateQualifiedNames;
	private String fFilePatterns;
	private boolean fRenameSubpackages;

	public static final String IDENTIFIER= "org.eclipse.jdt.ui.renamePackageProcessor"; //$NON-NLS-1$
	private RenamePackageChange fRenamePackageChange;

	/**
	 * Creates a new rename package processor.
	 * @param fragment the package fragment, or <code>null</code> if invoked by scripting
	 */
	public RenamePackageProcessor(IPackageFragment fragment) {
		fPackage= fragment;
		if (fPackage != null)
			setNewElementName(fPackage.getElementName());
		fUpdateReferences= true;
		fUpdateTextualMatches= false;
		fRenameSubpackages= false;
	}

	public RenamePackageProcessor(JavaRefactoringArguments arguments, RefactoringStatus status) {
		this(null);
		status.merge(initialize(arguments));
	}

	@Override
	public String getIdentifier() {
		return IDENTIFIER;
	}

	@Override
	public boolean isApplicable() throws CoreException {
		return RefactoringAvailabilityTester.isRenameAvailable(fPackage);
	}

	@Override
	public String getProcessorName(){
		return RefactoringCoreMessages.RenamePackageRefactoring_name;
	}

	@Override
	protected String[] getAffectedProjectNatures() throws CoreException {
		return JavaProcessors.computeAffectedNatures(fPackage);
	}

	@Override
	public Object[] getElements() {
		return new Object[] {fPackage};
	}

	@Override
	protected RenameModifications computeRenameModifications() throws CoreException {
		RenameModifications result= new RenameModifications();
		result.rename(fPackage, new RenameArguments(getNewElementName(), getUpdateReferences()), fRenameSubpackages);
		return result;
	}

	@Override
	protected IFile[] getChangedFiles() throws CoreException {
		Set<IFile> combined= new HashSet<>(Arrays.asList(ResourceUtil.getFiles(fChangeManager.getAllCompilationUnits())));
		if (fRenameSubpackages) {
			for (IPackageFragment pack : JavaElementUtil.getPackageAndSubpackages(fPackage)) {
				combined.addAll(Arrays.asList(ResourceUtil.getFiles(pack.getCompilationUnits())));
			}
		} else {
			combined.addAll(Arrays.asList(ResourceUtil.getFiles(fPackage.getCompilationUnits())));
		}
		if (fQualifiedNameSearchResult != null)
			combined.addAll(Arrays.asList(fQualifiedNameSearchResult.getAllFiles()));
		return combined.toArray(new IFile[combined.size()]);
	}

	@Override
	public int getSaveMode() {
		return RefactoringSaveHelper.SAVE_ALL;
	}

	//---- ITextUpdating -------------------------------------------------

	@Override
	public boolean canEnableTextUpdating() {
		return true;
	}

	@Override
	public boolean getUpdateTextualMatches() {
		return fUpdateTextualMatches;
	}

	@Override
	public void setUpdateTextualMatches(boolean update) {
		fUpdateTextualMatches= update;
	}

	//---- IReferenceUpdating --------------------------------------

	@Override
	public void setUpdateReferences(boolean update) {
		fUpdateReferences= update;
	}

	@Override
	public boolean getUpdateReferences(){
		return fUpdateReferences;
	}

	//---- IQualifiedNameUpdating ----------------------------------

	@Override
	public boolean canEnableQualifiedNameUpdating() {
		return !fPackage.isDefaultPackage();
	}

	@Override
	public boolean getUpdateQualifiedNames() {
		return fUpdateQualifiedNames;
	}

	@Override
	public void setUpdateQualifiedNames(boolean update) {
		fUpdateQualifiedNames= update;
	}

	@Override
	public String getFilePatterns() {
		return fFilePatterns;
	}

	@Override
	public void setFilePatterns(String patterns) {
		Assert.isNotNull(patterns);
		fFilePatterns= patterns;
	}

	//---- IResourceMapper  ----------------------------------

	@Override
	public IResource getRefactoredResource(IResource element) {
		IFolder packageFolder= (IFolder) fPackage.getResource();
		if (packageFolder == null)
			return element;

		IContainer newPackageFolder= (IContainer) getNewPackage().getResource();

		if (packageFolder.equals(element))
			return newPackageFolder;

		IPath packagePath= packageFolder.getProjectRelativePath();
		IPath elementPath= element.getProjectRelativePath();

		if (packagePath.isPrefixOf(elementPath)) {
			if (fRenameSubpackages || (element instanceof IFile && packageFolder.equals(element.getParent()))) {
				IPath pathInPackage= elementPath.removeFirstSegments(packagePath.segmentCount());
				if (element instanceof IFile)
					return newPackageFolder.getFile(pathInPackage);
				else
					return newPackageFolder.getFolder(pathInPackage);
			}
		}
		return element;
	}

	//---- IJavaElementMapper ----------------------------------

	@Override
	public IJavaElement getRefactoredJavaElement(IJavaElement original) {
		return new GenericRefactoringHandleTransplanter() {
			@Override
			protected IPackageFragment transplantHandle(IPackageFragmentRoot parent, IPackageFragment element) {
				if (! fRenameSubpackages) {
					if (fPackage.equals(element))
						return getNewPackage();
				} else {
					String packName= element.getElementName();
					String packageName= fPackage.getElementName();
					if (fPackage.getParent().equals(parent)
							&& packName.startsWith(packageName + '.')) {
						String newPackName= getNewElementName() + packName.substring(packageName.length() - 1);
						return getPackageFragmentRoot().getPackageFragment(newPackName);
					}
				}
				return super.transplantHandle(parent, element);
			}

			@Override
			protected IMethod transplantHandle(IType parent, IMethod element) {
				String[] parameterTypes= resolveParameterTypes(element);
				return parent.getMethod(element.getElementName(), parameterTypes);
			}

			private String[] resolveParameterTypes(IMethod method) {
				final String[] oldParameterTypes= method.getParameterTypes();
				final String[] newparams= new String[oldParameterTypes.length];

				final String[] possibleOldSigs= new String[2];
				//using type signature, since there is no package signature
				possibleOldSigs[0]= Signature.createTypeSignature(fPackage.getElementName(), false);
				possibleOldSigs[1]= Signature.createTypeSignature(fPackage.getElementName(), true);

				final String[] possibleNewSigs= new String[2];
				possibleNewSigs[0]= Signature.createTypeSignature(getNewElementName(), false);
				possibleNewSigs[1]= Signature.createTypeSignature(getNewElementName(), true);

				// Textually replace all occurrences
				// This handles stuff like Map<SomeClass, some.package.SomeClass>
				for (int i= 0; i < oldParameterTypes.length; i++) {
					newparams[i]= oldParameterTypes[i];
					for (int j= 0; j < possibleOldSigs.length; j++) {
						newparams[i]= Util.replaceAll(newparams[i], possibleOldSigs[j], possibleNewSigs[j]);
					}
				}
				return newparams;
			}
		}.transplantHandle(original);
	}

	//----

	public boolean canEnableRenameSubpackages() throws JavaModelException {
		return fPackage.hasSubpackages();
	}

	public boolean getRenameSubpackages() {
		return fRenameSubpackages;
	}

	public void setRenameSubpackages(boolean rename) {
		fRenameSubpackages= rename;
	}

	//---- IRenameProcessor ----------------------------------------------

	@Override
	public final String getCurrentElementName(){
		return fPackage.getElementName();
	}

	@Override
	public String getCurrentElementQualifier() {
		return ""; //$NON-NLS-1$
	}

	@Override
	public RefactoringStatus checkNewElementName(String newName) throws CoreException {
		Assert.isNotNull(newName, "new name"); //$NON-NLS-1$
		RefactoringStatus result= Checks.checkPackageName(newName, fPackage);
		if (result.hasFatalError())
			return result;
		if (Checks.isAlreadyNamed(fPackage, newName)) {
			result.addFatalError(RefactoringCoreMessages.RenamePackageRefactoring_another_name);
			return result;
		}
		result.merge(checkPackageInCurrentRoot(newName));
		return result;
	}

	@Override
	public Object getNewElement(){
		return getNewPackage();
	}

	private IPackageFragment getNewPackage() {
		IPackageFragmentRoot root= getPackageFragmentRoot();
		return root.getPackageFragment(getNewElementName());
	}

	@Override
	public RefactoringStatus checkInitialConditions(IProgressMonitor pm) throws CoreException {
		return new RefactoringStatus();
	}

	@Override
	protected RefactoringStatus doCheckFinalConditions(IProgressMonitor pm, CheckConditionsContext context) throws CoreException {
		try{
			pm.beginTask("", 23 + (fUpdateQualifiedNames ? 10 : 0) + (fUpdateTextualMatches ? 10 : 0)); //$NON-NLS-1$
			pm.setTaskName(RefactoringCoreMessages.RenamePackageRefactoring_checking);
			RefactoringStatus result= new RefactoringStatus();
			result.merge(checkNewElementName(getNewElementName()));
			pm.worked(1);
			result.merge(checkForMainAndNativeMethods());
			pm.worked(2);

			if (fPackage.isReadOnly()){
				String message= Messages.format(RefactoringCoreMessages.RenamePackageRefactoring_Packagered_only, getElementLabel(fPackage));
				result.addFatalError(message);
			} else if (Resources.isReadOnly(fPackage.getResource())) {
				String message= Messages.format(RefactoringCoreMessages.RenamePackageRefactoring_resource_read_only, getElementLabel(fPackage));
				result.addError(message);
			}

			result.merge(checkPackageName(getNewElementName()));
			if (result.hasFatalError())
				return result;

			fChangeManager= new TextChangeManager();
			fImportsManager= new ImportsManager();

			SubProgressMonitor subPm= new SubProgressMonitor(pm, 16);
			if (fRenameSubpackages) {
				IPackageFragment[] allSubpackages= JavaElementUtil.getPackageAndSubpackages(fPackage);
				subPm.beginTask("", allSubpackages.length); //$NON-NLS-1$
				for (IPackageFragment pack : allSubpackages) {
					new PackageRenamer(pack, this, fChangeManager, fImportsManager).doRename(new SubProgressMonitor(subPm, 1), result);
				}
				subPm.done();
			} else {
				new PackageRenamer(fPackage, this, fChangeManager, fImportsManager).doRename(subPm, result);
			}

			fImportsManager.rewriteImports(fChangeManager, new SubProgressMonitor(pm, 3));

			if (fUpdateTextualMatches) {
				pm.subTask(RefactoringCoreMessages.RenamePackageRefactoring_searching_text);
				TextMatchUpdater.perform(new SubProgressMonitor(pm, 10), RefactoringScopeFactory.create(fPackage), this, fChangeManager, new SearchResultGroup[0]);
			}

			if (fUpdateQualifiedNames)
				computeQualifiedNameMatches(new SubProgressMonitor(pm, 10));

			return result;
		} finally{
			pm.done();
		}
	}

	public IPackageFragment getPackage() {
		return fPackage;
	}

	private RefactoringStatus checkForMainAndNativeMethods() throws CoreException{
		RefactoringStatus result= new RefactoringStatus();
		if (fRenameSubpackages) {
			for (IPackageFragment pack : JavaElementUtil.getPackageAndSubpackages(fPackage)) {
				for (ICompilationUnit cu : pack.getCompilationUnits()) {
					result.merge(Checks.checkForMainAndNativeMethods(cu));
				}
			}
		} else {
			for (ICompilationUnit cu : fPackage.getCompilationUnits()) {
				result.merge(Checks.checkForMainAndNativeMethods(cu));
			}
		}
		return result;
	}

	/*
	 * returns true if the new name is ok if the specified root.
	 * if a package fragment with this name exists and has java resources,
	 * then the name is not ok.
	 */
	public static boolean isPackageNameOkInRoot(String newName, IPackageFragmentRoot root) throws CoreException {
		IPackageFragment pack= root.getPackageFragment(newName);
		return !pack.exists()
				|| (!pack.containsJavaResources() && pack.getNonJavaResources().length == 0);
	}

	private RefactoringStatus checkPackageInCurrentRoot(String newName) throws CoreException {
		if (fRenameSubpackages) {
			String currentName= getCurrentElementName();
			if (isAncestorPackage(currentName, newName)) {
				// renaming to subpackage (a -> a.b) is always OK, since all subpackages are also renamed
				return null;
			}
			if (! isAncestorPackage(newName, currentName)) {
				// renaming to an unrelated package
				if (! isPackageNameOkInRoot(newName, getPackageFragmentRoot())) {
					return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.RenamePackageRefactoring_package_exists);
				}
			}
			// renaming to superpackage (a.b -> a) or another package is OK iff
			// 'a.b' does not contain any subpackage that would collide with another subpackage of 'a'
			// (e.g. a.b.c collides if a.c already exists, but a.b.b does not collide with a.b)
			for (IPackageFragment pack : JavaElementUtil.getPackageAndSubpackages(fPackage)) {
				String newPack= newName + pack.getElementName().substring(currentName.length());
				if (! isAncestorPackage(currentName, newPack) && ! isPackageNameOkInRoot(newPack, getPackageFragmentRoot())) {
					String msg= Messages.format(RefactoringCoreMessages.RenamePackageProcessor_subpackage_collides, BasicElementLabels.getJavaElementName(newPack));
					return RefactoringStatus.createFatalErrorStatus(msg);
				}
			}
			return null;

		} else if (! isPackageNameOkInRoot(newName, getPackageFragmentRoot())) {
			return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.RenamePackageRefactoring_package_exists);
		} else {
			return null;
		}
	}

	private boolean isAncestorPackage(String ancestor, String descendant) {
		int a= ancestor.length();
		int d= descendant.length();
		if (a == d || (a < d && descendant.charAt(a) == '.'))
			return descendant.startsWith(ancestor);
		else
			return false;
	}

	private IPackageFragmentRoot getPackageFragmentRoot() {
		return ((IPackageFragmentRoot)fPackage.getParent());
	}

	private RefactoringStatus checkPackageName(String newName) throws CoreException {
		RefactoringStatus status= new RefactoringStatus();
		Set<String> topLevelTypeNames= getTopLevelTypeNames();
		for (IPackageFragmentRoot root : fPackage.getJavaProject().getPackageFragmentRoots()) {
			if (! isPackageNameOkInRoot(newName, root)) {
				String rootLabel = JavaElementLabels.getElementLabel(root, JavaElementLabels.ALL_DEFAULT);
				String newPackageName= BasicElementLabels.getJavaElementName(getNewElementName());
				String message= Messages.format(RefactoringCoreMessages.RenamePackageRefactoring_aleady_exists, new Object[]{ newPackageName, rootLabel});
				status.merge(RefactoringStatus.createWarningStatus(message));
				status.merge(checkTypeNameConflicts(root, newName, topLevelTypeNames));
			}
		}
		return status;
	}

	private Set<String> getTopLevelTypeNames() throws CoreException {
		ICompilationUnit[] cus= fPackage.getCompilationUnits();
		Set<String> result= new HashSet<>(2 * cus.length);
		for (ICompilationUnit cu : cus) {
			result.addAll(getTopLevelTypeNames(cu));
		}
		return result;
	}

	private static Collection<String> getTopLevelTypeNames(ICompilationUnit iCompilationUnit) throws CoreException {
		IType[] types= iCompilationUnit.getTypes();
		List<String> result= new ArrayList<>(types.length);
		for (IType type : types) {
			result.add(type.getElementName());
		}
		return result;
	}

	private RefactoringStatus checkTypeNameConflicts(IPackageFragmentRoot root, String newName, Set<String> topLevelTypeNames) throws CoreException {
		IPackageFragment otherPack= root.getPackageFragment(newName);
		if (fPackage.equals(otherPack))
			return null;
		RefactoringStatus result= new RefactoringStatus();
		for (ICompilationUnit cu : otherPack.getCompilationUnits()) {
			result.merge(checkTypeNameConflicts(cu, topLevelTypeNames));
		}
		return result;
	}

	private RefactoringStatus checkTypeNameConflicts(ICompilationUnit iCompilationUnit, Set<String> topLevelTypeNames) throws CoreException {
		RefactoringStatus result= new RefactoringStatus();

		for (IType type : iCompilationUnit.getTypes()) {
			String name= type.getElementName();
			if (topLevelTypeNames.contains(name)) {
				String[] keys= {getElementLabel(iCompilationUnit.getParent()), getElementLabel(type)};
				String msg= Messages.format(RefactoringCoreMessages.RenamePackageRefactoring_contains_type, keys);
				RefactoringStatusContext context= JavaStatusContext.create(type);
				result.addError(msg, context);
			}
		}
		return result;
	}

	@Override
	public Change createChange(IProgressMonitor monitor) throws CoreException {
		try {
			monitor.beginTask(RefactoringCoreMessages.RenamePackageRefactoring_creating_change, 1);
			final RenameJavaElementDescriptor descriptor= createRefactoringDescriptor();
			final DynamicValidationRefactoringChange result= new DynamicValidationRefactoringChange(descriptor, RefactoringCoreMessages.RenamePackageRefactoring_change_name);
			result.addAll(fChangeManager.getAllChanges());
			fRenamePackageChange= new RenamePackageChange( fPackage, getNewElementName(),  fRenameSubpackages);
			result.add(fRenamePackageChange);
			monitor.worked(1);
			return result;
		} finally {
			fChangeManager= null;
			fImportsManager= null;
			monitor.done();
		}
	}

	private RenameJavaElementDescriptor createRefactoringDescriptor() {
		String project= null;
		IJavaProject javaProject= fPackage.getJavaProject();
		if (javaProject != null)
			project= javaProject.getElementName();
		final int flags= JavaRefactoringDescriptor.JAR_MIGRATION | JavaRefactoringDescriptor.JAR_REFACTORING | RefactoringDescriptor.STRUCTURAL_CHANGE | RefactoringDescriptor.MULTI_CHANGE;
		final String description= Messages.format(RefactoringCoreMessages.RenamePackageProcessor_descriptor_description_short, getElementLabel(fPackage));
		final String header= Messages.format(RefactoringCoreMessages.RenamePackageProcessor_descriptor_description, new String[] { getElementLabel(fPackage), getNewElementName()});
		final JDTRefactoringDescriptorComment comment= new JDTRefactoringDescriptorComment(project, this, header);
		if (fRenameSubpackages)
			comment.addSetting(RefactoringCoreMessages.RenamePackageProcessor_rename_subpackages);
		final RenameJavaElementDescriptor descriptor= RefactoringSignatureDescriptorFactory.createRenameJavaElementDescriptor(IJavaRefactorings.RENAME_PACKAGE);
		descriptor.setProject(project);
		descriptor.setDescription(description);
		descriptor.setComment(comment.asString());
		descriptor.setFlags(flags);
		descriptor.setJavaElement(fPackage);
		descriptor.setNewName(getNewElementName());
		descriptor.setUpdateReferences(fUpdateReferences);
		descriptor.setUpdateTextualOccurrences(fUpdateTextualMatches);
		descriptor.setUpdateQualifiedNames(fUpdateQualifiedNames);
		if (fUpdateQualifiedNames && fFilePatterns != null && !"".equals(fFilePatterns)) //$NON-NLS-1$
			descriptor.setFileNamePatterns(fFilePatterns);
		descriptor.setUpdateHierarchy(fRenameSubpackages);
		return descriptor;
	}

	private static String getElementLabel(IJavaElement javaElement) {
		return JavaElementLabels.getElementLabel(javaElement, JavaElementLabels.ALL_DEFAULT);
	}

	@Override
	public Change postCreateChange(Change[] participantChanges, IProgressMonitor pm) throws CoreException {
		if (fQualifiedNameSearchResult != null) {
			CompositeChange parent= (CompositeChange) fRenamePackageChange.getParent();
			try {
				/*
				 * Sneak text changes in before the package rename to ensure
				 * modified files are still at original location (see
				 * https://bugs.eclipse.org/bugs/show_bug.cgi?id=154238)
				 */
				parent.remove(fRenamePackageChange);
				parent.add(fQualifiedNameSearchResult.getSingleChange(Changes.getModifiedFiles(participantChanges)));
			} finally {
				fQualifiedNameSearchResult= null;
				parent.add(fRenamePackageChange);
				fRenamePackageChange= null;
			}
		}
		return null;
	}

	private void computeQualifiedNameMatches(IProgressMonitor pm) {
		if (fQualifiedNameSearchResult == null)
			fQualifiedNameSearchResult= new QualifiedNameSearchResult();
		QualifiedNameFinder.process(fQualifiedNameSearchResult, fPackage.getElementName(), getNewElementName(),
			fFilePatterns, fPackage.getJavaProject().getProject(), pm);
	}

	public String getNewPackageName(String oldSubPackageName) {
		String oldPackageName= getPackage().getElementName();
		return getNewElementName() + oldSubPackageName.substring(oldPackageName.length());
	}

	private static class PackageRenamer {
		private final IPackageFragment fPackage;
		private final RenamePackageProcessor fProcessor;
		private final TextChangeManager fTextChangeManager;
		private final ImportsManager fImportsManager;

		/** references to fPackage (can include star imports which also import namesake package fragments) */
		private SearchResultGroup[] fOccurrences;

		/** References in CUs from fOccurrences and fPackage to types in namesake packages.
		 * <p>These need an import with the old package name.
		 * <p>- from fOccurrences (without namesakes): may have shared star import
		 * 		(star-import not updated here, but for fOccurrences)
		 * <p>- from fPackage: may have unimported references to types of namesake packages
		 * <p>- both: may have unused imports of namesake packages.
		 * <p>Mutable List of SearchResultGroup. */
		private List<SearchResultGroup> fReferencesToTypesInNamesakes;

		/** References in CUs from namesake packages to types in fPackage.
		 * <p>These need an import with the new package name.
		 * <p>Mutable List of SearchResultGroup. */
		private List<SearchResultGroup> fReferencesToTypesInPackage;

		public PackageRenamer(IPackageFragment pack, RenamePackageProcessor processor, TextChangeManager textChangeManager, ImportsManager importsManager) {
			fPackage= pack;
			fProcessor= processor;
			fTextChangeManager= textChangeManager;
			fImportsManager= importsManager;
		}

		void doRename(IProgressMonitor pm, RefactoringStatus result) throws CoreException {
			pm.beginTask("", 16); //$NON-NLS-1$
			if (fProcessor.getUpdateReferences()){
				pm.setTaskName(RefactoringCoreMessages.RenamePackageRefactoring_searching);

				String binaryRefsDescription= Messages.format(RefactoringCoreMessages.ReferencesInBinaryContext_ref_in_binaries_description , getElementLabel(fPackage));
				ReferencesInBinaryContext binaryRefs= new ReferencesInBinaryContext(binaryRefsDescription);

				fOccurrences= getReferences(new SubProgressMonitor(pm, 4), binaryRefs, result);
				fReferencesToTypesInNamesakes= getReferencesToTypesInNamesakes(new SubProgressMonitor(pm, 4), result);
				fReferencesToTypesInPackage= getReferencesToTypesInPackage(new SubProgressMonitor(pm, 4), binaryRefs, result);
				binaryRefs.addErrorIfNecessary(result);

				pm.setTaskName(RefactoringCoreMessages.RenamePackageRefactoring_checking);
				result.merge(analyzeAffectedCompilationUnits());
				pm.worked(1);
			} else {
				fOccurrences= new SearchResultGroup[0];
				pm.worked(13);
			}

			if (result.hasFatalError())
				return;

			if (fProcessor.getUpdateReferences())
				addReferenceUpdates(new SubProgressMonitor(pm, 3));
			else
				pm.worked(3);

			pm.done();
		}

		private SearchResultGroup[] getReferences(IProgressMonitor pm, ReferencesInBinaryContext binaryRefs, RefactoringStatus status) throws CoreException {
			IJavaSearchScope scope= RefactoringScopeFactory.create(fPackage, true, false);
			SearchPattern pattern= SearchPattern.createPattern(fPackage, IJavaSearchConstants.REFERENCES);
			CollectingSearchRequestor requestor= new CuCollectingSearchRequestor(binaryRefs);
			return RefactoringSearchEngine.search(pattern, scope, requestor, pm, status);
		}

		private void addReferenceUpdates(IProgressMonitor pm) throws CoreException {
			pm.beginTask("", fOccurrences.length + fReferencesToTypesInPackage.size() + fReferencesToTypesInNamesakes.size()); //$NON-NLS-1$
			for (SearchResultGroup occurrence : fOccurrences) {
				ICompilationUnit cu= occurrence.getCompilationUnit();
				if (cu == null)
					continue;
				for (SearchMatch result : occurrence.getSearchResults()) {
					IJavaElement enclosingElement= SearchUtils.getEnclosingJavaElement(result);
					if (enclosingElement instanceof IImportDeclaration) {
						IImportDeclaration importDeclaration= (IImportDeclaration) enclosingElement;
						String updatedImport= getUpdatedImport(importDeclaration);
						updateImport(cu, importDeclaration, updatedImport);
					} else { // is reference
						TextChangeCompatibility.addTextEdit(fTextChangeManager.get(cu), RefactoringCoreMessages.RenamePackageRefactoring_update_reference, createTextChange(result));
					}
				}
				if (!fReferencesToTypesInNamesakes.isEmpty()) {
					SearchResultGroup typeRefsRequiringOldNameImport= extractGroupFor(cu, fReferencesToTypesInNamesakes);
					if (typeRefsRequiringOldNameImport != null)
						addTypeImports(typeRefsRequiringOldNameImport);
				}
				if (!fReferencesToTypesInPackage.isEmpty()) {
					SearchResultGroup typeRefsRequiringNewNameImport= extractGroupFor(cu, fReferencesToTypesInPackage);
					if (typeRefsRequiringNewNameImport != null)
						updateTypeImports(typeRefsRequiringNewNameImport);
				}
				pm.worked(1);
			}

			if (!fReferencesToTypesInNamesakes.isEmpty()) {
				for (SearchResultGroup referencesToTypesInNamesakes : fReferencesToTypesInNamesakes) {
					addTypeImports(referencesToTypesInNamesakes);
					pm.worked(1);
				}
			}
			if (!fReferencesToTypesInPackage.isEmpty()) {
				for (SearchResultGroup namesakeReferencesToPackage : fReferencesToTypesInPackage) {
					updateTypeImports(namesakeReferencesToPackage);
					pm.worked(1);
				}
			}
			pm.done();
		}

		/** Removes the found SearchResultGroup from the list iff found.
		 *  @param cu the cu
		 *  @param searchResultGroups List of SearchResultGroup
		 *  @return the SearchResultGroup for cu, or null iff not found */
		private static SearchResultGroup extractGroupFor(ICompilationUnit cu, List<SearchResultGroup> searchResultGroups) {
			for (Iterator<SearchResultGroup> iter= searchResultGroups.iterator(); iter.hasNext();) {
				SearchResultGroup group= iter.next();
				if (cu.equals(group.getCompilationUnit())) {
					iter.remove();
					return group;
				}
			}
			return null;
		}

		private TextEdit createTextChange(SearchMatch searchResult) {
			return new ReplaceEdit(searchResult.getOffset(), searchResult.getLength(), getNewPackageName());
		}

		private RefactoringStatus analyzeAffectedCompilationUnits() throws CoreException {
			//TODO: also for both fReferencesTo...; only check each CU once!
			RefactoringStatus result= new RefactoringStatus();
			fOccurrences= Checks.excludeCompilationUnits(fOccurrences, result);
			if (result.hasFatalError())
				return result;

			result.merge(Checks.checkCompileErrorsInAffectedFiles(fOccurrences));
			return result;
		}

		/**
		 * @return search scope with
		 * <p>- fPackage and
		 * <p>- all CUs from fOccurrences which are not in a namesake package
		 */
		private IJavaSearchScope getPackageAndOccurrencesWithoutNamesakesScope() {
			List<IJavaElement> scopeList= new ArrayList<>();
			scopeList.add(fPackage);
			for (SearchResultGroup occurrence : fOccurrences) {
				ICompilationUnit cu= occurrence.getCompilationUnit();
				if (cu == null)
					continue;
				IPackageFragment pack= (IPackageFragment) cu.getParent();
				if (! pack.getElementName().equals(fPackage.getElementName()))
					scopeList.add(cu);
			}
			return SearchEngine.createJavaSearchScope(scopeList.toArray(new IJavaElement[scopeList.size()]));
		}

		private List<SearchResultGroup> getReferencesToTypesInNamesakes(IProgressMonitor pm, RefactoringStatus status) throws CoreException {
			pm.beginTask("", 2); //$NON-NLS-1$
			// e.g. renaming B-p.p; project C requires B, X and has ref to B-p.p and X-p.p;
			// goal: find refs to X-p.p in CUs from fOccurrences

			// (1) find namesake packages (scope: all packages referenced by CUs in fOccurrences and fPackage)
			IJavaElement[] elements= new IJavaElement[fOccurrences.length + 1];
			for (int i= 0; i < fOccurrences.length; i++) {
				elements[i]= fOccurrences[i].getCompilationUnit();
			}
			elements[fOccurrences.length]= fPackage;
			IJavaSearchScope namesakePackagesScope= RefactoringScopeFactory.createReferencedScope(elements);
			IPackageFragment[] namesakePackages= getNamesakePackages(namesakePackagesScope, new SubProgressMonitor(pm, 1));
			if (namesakePackages.length == 0) {
				pm.done();
				return new ArrayList<>(0);
			}

			// (2) find refs in fOccurrences and fPackage to namesake packages
			// (from fOccurrences (without namesakes): may have shared star import)
			// (from fPackage: may have unimported references to types of namesake packages)
			IType[] typesToSearch= getTypesInPackages(namesakePackages);
			if (typesToSearch.length == 0) {
				pm.done();
				return new ArrayList<>(0);
			}
			SearchPattern pattern= RefactoringSearchEngine.createOrPattern(typesToSearch, IJavaSearchConstants.REFERENCES);
			IJavaSearchScope scope= getPackageAndOccurrencesWithoutNamesakesScope();
			SearchResultGroup[] results= RefactoringSearchEngine.search(pattern, scope, new SubProgressMonitor(pm, 1), status);
			pm.done();
			return new ArrayList<>(Arrays.asList(results));
		}

		private List<SearchResultGroup> getReferencesToTypesInPackage(IProgressMonitor pm, ReferencesInBinaryContext binaryRefs, RefactoringStatus status) throws CoreException {
			pm.beginTask("", 2); //$NON-NLS-1$
			IJavaSearchScope referencedFromNamesakesScope= RefactoringScopeFactory.create(fPackage, true, false);
			IPackageFragment[] namesakePackages= getNamesakePackages(referencedFromNamesakesScope, new SubProgressMonitor(pm, 1));
			if (namesakePackages.length == 0) {
				pm.done();
				return new ArrayList<>(0);
			}

			IJavaSearchScope scope= SearchEngine.createJavaSearchScope(namesakePackages);
			IType[] typesToSearch= getTypesInPackage(fPackage);
			if (typesToSearch.length == 0) {
				pm.done();
				return new ArrayList<>(0);
			}
			SearchPattern pattern= RefactoringSearchEngine.createOrPattern(typesToSearch, IJavaSearchConstants.REFERENCES);
			CollectingSearchRequestor requestor= new CuCollectingSearchRequestor(binaryRefs);
			SearchResultGroup[] results= RefactoringSearchEngine.search(pattern, scope, requestor, new SubProgressMonitor(pm, 1), status);
			pm.done();
			return new ArrayList<>(Arrays.asList(results));
		}

		private IType[] getTypesInPackage(IPackageFragment packageFragment) throws JavaModelException {
			List<IType> types= new ArrayList<>();
			addContainedTypes(packageFragment, types);
			return types.toArray(new IType[types.size()]);
		}

		/**
		 * @param scope search scope
		 * @param pm mrogress monitor
		 * @return all package fragments in <code>scope</code> with same name as <code>fPackage</code>, excluding fPackage
		 * @throws CoreException if search failed
		 */
		private IPackageFragment[] getNamesakePackages(IJavaSearchScope scope, IProgressMonitor pm) throws CoreException {
			SearchPattern pattern= SearchPattern.createPattern(fPackage.getElementName(), IJavaSearchConstants.PACKAGE, IJavaSearchConstants.DECLARATIONS, SearchPattern.R_EXACT_MATCH | SearchPattern.R_CASE_SENSITIVE);

			final HashSet<IPackageFragment> packageFragments= new HashSet<>();
			SearchRequestor requestor= new SearchRequestor() {
				@Override
				public void acceptSearchMatch(SearchMatch match) throws CoreException {
					IJavaElement enclosingElement= SearchUtils.getEnclosingJavaElement(match);
					if (enclosingElement instanceof IPackageFragment) {
						IPackageFragment pack= (IPackageFragment) enclosingElement;
						if (! fPackage.equals(pack))
							packageFragments.add(pack);
					}
				}
			};
			new SearchEngine().search(pattern, SearchUtils.getDefaultSearchParticipants(), scope, requestor, pm);

			return packageFragments.toArray(new IPackageFragment[packageFragments.size()]);
		}

		private IType[] getTypesInPackages(IPackageFragment[] packageFragments) throws JavaModelException {
			List<IType> types= new ArrayList<>();
			for (IPackageFragment pack : packageFragments) {
				addContainedTypes(pack, types);
			}
			return types.toArray(new IType[types.size()]);
		}

		private void addContainedTypes(IPackageFragment pack, List<IType> typesCollector) throws JavaModelException {
			for (IJavaElement child : pack.getChildren()) {
				if (child instanceof ICompilationUnit) {
					typesCollector.addAll(Arrays.asList(((ICompilationUnit) child).getTypes()));
				} else if (child instanceof IOrdinaryClassFile) {
					typesCollector.add(((IOrdinaryClassFile) child).getType());
				}
			}
		}

		private void updateImport(ICompilationUnit cu, IImportDeclaration importDeclaration, String updatedImport) throws JavaModelException {
			ImportChange importChange= fImportsManager.getImportChange(cu);
			if (Flags.isStatic(importDeclaration.getFlags())) {
				importChange.removeStaticImport(importDeclaration.getElementName());
				importChange.addStaticImport(Signature.getQualifier(updatedImport), Signature.getSimpleName(updatedImport));
			} else {
				importChange.removeImport(importDeclaration.getElementName());
				importChange.addImport(updatedImport);
			}
		}

		/**
		 * Add new imports to types in <code>typeReferences</code> with package <code>fPackage</code>.
		 * @param typeReferences type references
		 * @throws CoreException should not happen
		 */
		private void addTypeImports(SearchResultGroup typeReferences) throws CoreException {
			for (SearchMatch result : typeReferences.getSearchResults()) {
				IJavaElement enclosingElement= SearchUtils.getEnclosingJavaElement(result);
				if (! (enclosingElement instanceof IImportDeclaration)) {
					String reference= getNormalizedTypeReference(result);
					if (! reference.startsWith(fPackage.getElementName())) {
						// is unqualified
						reference= cutOffInnerTypes(reference);
						ImportChange importChange= fImportsManager.getImportChange(typeReferences.getCompilationUnit());
						importChange.addImport(fPackage.getElementName() + '.' + reference);
					}
				}
			}
		}

		/**
		 * Add new imports to types in <code>typeReferences</code> with package <code>fNewElementName</code>
		 * and remove old import with <code>fPackage</code>.
		 * @param typeReferences type references
		 * @throws CoreException should not happen
		 */
		private void updateTypeImports(SearchResultGroup typeReferences) throws CoreException {
			for (SearchMatch result : typeReferences.getSearchResults()) {
				IJavaElement enclosingElement= SearchUtils.getEnclosingJavaElement(result);
				if (enclosingElement instanceof IImportDeclaration) {
					IImportDeclaration importDeclaration= (IImportDeclaration) enclosingElement;
					updateImport(typeReferences.getCompilationUnit(), importDeclaration, getUpdatedImport(importDeclaration));
				} else {
					String reference= getNormalizedTypeReference(result);
					if (! reference.startsWith(fPackage.getElementName())) {
						reference= cutOffInnerTypes(reference);
						ImportChange importChange= fImportsManager.getImportChange(typeReferences.getCompilationUnit());
						importChange.removeImport(fPackage.getElementName() + '.' + reference);
						importChange.addImport(getNewPackageName() + '.' + reference);
					} // else: already found & updated with package reference search
				}
			}
		}

		private static String getNormalizedTypeReference(SearchMatch searchResult) throws JavaModelException {
			ICompilationUnit cu= SearchUtils.getCompilationUnit(searchResult);
			String reference= cu.getBuffer().getText(searchResult.getOffset(), searchResult.getLength());
			//reference may be package-qualified -> normalize (remove comments, etc.):
			return CommentAnalyzer.normalizeReference(reference);
		}

		private static String cutOffInnerTypes(String reference) {
			int dotPos= reference.indexOf('.'); // cut off inner types
			if (dotPos != -1)
				reference= reference.substring(0, dotPos);
			return reference;
		}

		private String getUpdatedImport(IImportDeclaration importDeclaration) {
			String fullyQualifiedImportType= importDeclaration.getElementName();
			int offsetOfDotBeforeTypeName= fPackage.getElementName().length();
			String result= getNewPackageName() + fullyQualifiedImportType.substring(offsetOfDotBeforeTypeName);
			return result;
		}

		private String getNewPackageName() {
			return fProcessor.getNewPackageName(fPackage.getElementName());
		}
	}

	/**
	 * Collector for import additions/removals.
	 * Saves all changes for a one-pass rewrite.
	 */
	static class ImportsManager {
		public static class ImportChange {
			private ArrayList<String> fStaticToRemove= new ArrayList<>();
			private ArrayList<String[]> fStaticToAdd= new ArrayList<>();
			private ArrayList<String> fToRemove= new ArrayList<>();
			private ArrayList<String> fToAdd= new ArrayList<>();

			public void removeStaticImport(String elementName) {
				fStaticToRemove.add(elementName);
			}

			public void addStaticImport(String declaringType, String memberName) {
				fStaticToAdd.add(new String[] {declaringType, memberName});
			}

			public void removeImport(String elementName) {
				fToRemove.add(elementName);
			}

			public void addImport(String elementName) {
				fToAdd.add(elementName);
			}
		}

		private HashMap<ICompilationUnit, ImportChange> fImportChanges= new HashMap<>();

		public ImportChange getImportChange(ICompilationUnit cu) {
			ImportChange importChange= fImportChanges.get(cu);
			if (importChange == null) {
				importChange= new ImportChange();
				fImportChanges.put(cu, importChange);
			}
			return importChange;
		}

		public void rewriteImports(TextChangeManager changeManager, IProgressMonitor pm) throws CoreException {
			for (Entry<ICompilationUnit, ImportChange> entry : fImportChanges.entrySet()) {
				ICompilationUnit cu= entry.getKey();
				ImportChange importChange= entry.getValue();
				ImportRewrite importRewrite= StubUtility.createImportRewrite(cu, true);
				importRewrite.setFilterImplicitImports(false);
				for (String toRemove : importChange.fStaticToRemove) {
					importRewrite.removeStaticImport(toRemove);
				}
				for (String toRemove : importChange.fToRemove) {
					importRewrite.removeImport(toRemove);
				}
				for (String[] toAdd : importChange.fStaticToAdd) {
					importRewrite.addStaticImport(toAdd[0], toAdd[1], true);
				}
				for (String toAdd : importChange.fToAdd) {
					importRewrite.addImport(toAdd);
				}

				if (importRewrite.hasRecordedChanges()) {
					TextEdit importEdit= importRewrite.rewriteImports(pm);
					String name= RefactoringCoreMessages.RenamePackageRefactoring_update_imports;
					try {
						TextChangeCompatibility.addTextEdit(changeManager.get(cu), name, importEdit);
					} catch (MalformedTreeException e) {
						JavaPlugin.logErrorMessage("MalformedTreeException while processing cu " + cu); //$NON-NLS-1$
						throw e;
					}
				}
			}
		}
	}

	private RefactoringStatus initialize(JavaRefactoringArguments extended) {
		final String handle= extended.getAttribute(JavaRefactoringDescriptorUtil.ATTRIBUTE_INPUT);
		if (handle != null) {
			final IJavaElement element= JavaRefactoringDescriptorUtil.handleToElement(extended.getProject(), handle, false);
			if (element == null || !element.exists() || element.getElementType() != IJavaElement.PACKAGE_FRAGMENT)
				return JavaRefactoringDescriptorUtil.createInputFatalStatus(element, getProcessorName(), IJavaRefactorings.RENAME_PACKAGE);
			else
				fPackage= (IPackageFragment) element;
		} else
			return RefactoringStatus.createFatalErrorStatus(Messages.format(RefactoringCoreMessages.InitializableRefactoring_argument_not_exist, JavaRefactoringDescriptorUtil.ATTRIBUTE_INPUT));
		final String name= extended.getAttribute(JavaRefactoringDescriptorUtil.ATTRIBUTE_NAME);
		if (name != null && !"".equals(name)) //$NON-NLS-1$
			setNewElementName(name);
		else
			return RefactoringStatus.createFatalErrorStatus(Messages.format(RefactoringCoreMessages.InitializableRefactoring_argument_not_exist, JavaRefactoringDescriptorUtil.ATTRIBUTE_NAME));
		final String patterns= extended.getAttribute(ATTRIBUTE_PATTERNS);
		if (patterns != null && !"".equals(patterns)) //$NON-NLS-1$
			fFilePatterns= patterns;
		else
			fFilePatterns= ""; //$NON-NLS-1$
		final String references= extended.getAttribute(JavaRefactoringDescriptorUtil.ATTRIBUTE_REFERENCES);
		if (references != null) {
			fUpdateReferences= Boolean.parseBoolean(references);
		} else
			return RefactoringStatus.createFatalErrorStatus(Messages.format(RefactoringCoreMessages.InitializableRefactoring_argument_not_exist, JavaRefactoringDescriptorUtil.ATTRIBUTE_REFERENCES));
		final String matches= extended.getAttribute(ATTRIBUTE_TEXTUAL_MATCHES);
		if (matches != null) {
			fUpdateTextualMatches= Boolean.parseBoolean(matches);
		} else
			return RefactoringStatus.createFatalErrorStatus(Messages.format(RefactoringCoreMessages.InitializableRefactoring_argument_not_exist, ATTRIBUTE_TEXTUAL_MATCHES));
		final String qualified= extended.getAttribute(ATTRIBUTE_QUALIFIED);
		if (qualified != null) {
			fUpdateQualifiedNames= Boolean.parseBoolean(qualified);
		} else
			return RefactoringStatus.createFatalErrorStatus(Messages.format(RefactoringCoreMessages.InitializableRefactoring_argument_not_exist, ATTRIBUTE_QUALIFIED));
		final String hierarchical= extended.getAttribute(ATTRIBUTE_HIERARCHICAL);
		if (hierarchical != null) {
			fRenameSubpackages= Boolean.parseBoolean(hierarchical);
		} else
			return RefactoringStatus.createFatalErrorStatus(Messages.format(RefactoringCoreMessages.InitializableRefactoring_argument_not_exist, ATTRIBUTE_HIERARCHICAL));
		return new RefactoringStatus();
	}
}