content: /*******************************************************************************
   * Copyright (c) 2000, 2009 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.wst.jsdt.internal.corext.refactoring.rename;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Set;
  
  import org.eclipse.core.resources.IContainer;
  import org.eclipse.core.resources.IFile;
  import org.eclipse.core.resources.IFolder;
  import org.eclipse.core.resources.IProject;
  import org.eclipse.core.resources.IResource;
  import org.eclipse.core.resources.ResourcesPlugin;
  import org.eclipse.core.resources.mapping.IResourceChangeDescriptionFactory;
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.IPath;
  import org.eclipse.ltk.core.refactoring.RefactoringStatus;
  import org.eclipse.ltk.core.refactoring.participants.IParticipantDescriptorFilter;
  import org.eclipse.ltk.core.refactoring.participants.MoveArguments;
  import org.eclipse.ltk.core.refactoring.participants.ParticipantManager;
  import org.eclipse.ltk.core.refactoring.participants.RefactoringArguments;
  import org.eclipse.ltk.core.refactoring.participants.RefactoringParticipant;
  import org.eclipse.ltk.core.refactoring.participants.RefactoringProcessor;
  import org.eclipse.ltk.core.refactoring.participants.RenameArguments;
  import org.eclipse.ltk.core.refactoring.participants.SharableParticipants;
  import org.eclipse.ltk.core.refactoring.participants.ValidateEditChecker;
  import org.eclipse.wst.jsdt.core.IField;
  import org.eclipse.wst.jsdt.core.IFunction;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IJavaScriptProject;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.ILocalVariable;
  import org.eclipse.wst.jsdt.core.IPackageFragment;
  import org.eclipse.wst.jsdt.core.IPackageFragmentRoot;
  import org.eclipse.wst.jsdt.core.IType;
  import org.eclipse.wst.jsdt.core.refactoring.RenameTypeArguments;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.participants.ResourceModifications;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.RefactoringModifications;
  
  public class RenameModifications extends RefactoringModifications {
  	
  	private List fRename;
  	private List fRenameArguments;
  	private List fParticipantDescriptorFilter;
  	
  	public RenameModifications() {
  		fRename= new ArrayList();
  		fRenameArguments= new ArrayList();
  		fParticipantDescriptorFilter= new ArrayList();
  	}
  	
  	public void rename(IResource resource, RenameArguments args) {
  		add(resource, args, null);
  	}
  
  	public void rename(IJavaScriptProject project, RenameArguments args) {
  		add(project, args, null);
  		IProject rProject= project.getProject();
  		if (rProject != null) {
  			getResourceModifications().addRename(rProject, args);
  			IProject[] referencingProjects= rProject.getReferencingProjects();
  			for (int i= 0; i < referencingProjects.length; i++) {
  				IFile classpath= getClasspathFile(referencingProjects[i]);
  				if (classpath != null) {
  					getResourceModifications().addChanged(classpath);
  				}
  			}
  		}
  	}
  
  	public void rename(IPackageFragmentRoot sourceFolder, RenameArguments arguments) {
  		add(sourceFolder, arguments, null);
  		if (sourceFolder.getResource() != null) {
  			getResourceModifications().addRename(sourceFolder.getResource(), arguments);
  		}
  	}
  	
  	public void rename(IPackageFragment rootPackage, RenameArguments args, boolean renameSubPackages) throws CoreException {
  		add(rootPackage, args, null);
  		IPackageFragment[] allSubPackages= null;
  		if (renameSubPackages) {
  			allSubPackages= getSubpackages(rootPackage);
  			for (int i= 0; i < allSubPackages.length; i++) {
  				IPackageFragment pack= allSubPackages[i];
  				RenameArguments subArgs= new RenameArguments(
  					getNewPackageName(rootPackage, args.getNewName(), pack.getElementName()), 
  					args.getUpdateReferences());
  				add(pack, subArgs, null);
  			}
  		}
  		IContainer container= (IContainer)rootPackage.getResource();
  		if (container == null)
  			return;
  		IContainer target= (IContainer) ((IPackageFragmentRoot)rootPackage.getParent()).
  			getPackageFragment(args.getNewName()).getResource();
  		if ((!rootPackage.hasSubpackages() || renameSubPackages) && canMove(container, target)) {
  			createIncludingParents(target.getParent());
  			if (container.getParent().equals(target.getParent())) {
  				getResourceModifications().addRename(container, new RenameArguments(target.getName(), args.getUpdateReferences()));
  			} else {
  				// This is a little tricky. The problem is that the refactoring participants
  				// don't support a generic move like the resource API does. So for the delta
  				// we generate one move, however for the participants we have to generate single
  				// moves and deletes.
  				try {
  					getResourceModifications().ignoreForDelta();
  					addAllResourceModifications(rootPackage, args, renameSubPackages, allSubPackages);
  				} finally {
  					getResourceModifications().trackForDelta();
  				}
  				getResourceModifications().addDelta(new ResourceModifications.MoveDescription(container, target.getFullPath()));
  			}
  		} else {
  			addAllResourceModifications(rootPackage, args, renameSubPackages, allSubPackages);
  		}
  	}
  
  	public void rename(IJavaScriptUnit unit, RenameArguments args) {
  		add(unit, args, null);
  		if (unit.getResource() != null) {
  			getResourceModifications().addRename(unit.getResource(), new RenameArguments(args.getNewName(), args.getUpdateReferences()));
  		}
  	}
  	
  	public void rename(IType type, RenameTypeArguments args, IParticipantDescriptorFilter filter) {
  		add(type, args, filter);
  	}
  	
  	public void rename(IField field, RenameArguments args) {
  		add(field, args, null);
  	}
  	
  	public void rename(IFunction method, RenameArguments args) {
  		add(method, args, null);
  	} 
  	
  	public void rename(ILocalVariable variable, RenameArguments args) {
  		add(variable, args, null);
  	}
  	
  	public void buildDelta(IResourceChangeDescriptionFactory builder) {
  		for (int i= 0; i < fRename.size(); i++) {
  			Object element= fRename.get(i);
  			if (element instanceof IResource) {
  				ResourceModifications.buildMoveDelta(builder, (IResource) element, (RenameArguments) fRenameArguments.get(i));
  			}
  		}
  		getResourceModifications().buildDelta(builder);
  	}
  	
  	public void buildValidateEdits(ValidateEditChecker checker) {
  		for (Iterator iter= fRename.iterator(); iter.hasNext();) {
  			Object element= iter.next();
  			if (element instanceof IJavaScriptUnit) {
  				IJavaScriptUnit unit= (IJavaScriptUnit)element;
  				IResource resource= unit.getResource();
  				if (resource != null && resource.getType() == IResource.FILE) {
  					checker.addFile((IFile)resource);
  				}
  			}
  		}
  	}
  
  	public RefactoringParticipant[] loadParticipants(RefactoringStatus status, RefactoringProcessor owner, String[] natures, SharableParticipants shared) {
  		List result= new ArrayList();
  		for (int i= 0; i < fRename.size(); i++) {
  			result.addAll(Arrays.asList(ParticipantManager.loadRenameParticipants(status, 
  				owner, fRename.get(i), 
  				(RenameArguments) fRenameArguments.get(i), 
  				(IParticipantDescriptorFilter) fParticipantDescriptorFilter.get(i), 
  				natures, shared)));
  		}
  		result.addAll(Arrays.asList(getResourceModifications().getParticipants(status, owner, natures, shared)));
  		return (RefactoringParticipant[]) result.toArray(new RefactoringParticipant[result.size()]);
  	}
  	
  	private void add(Object element, RefactoringArguments args, IParticipantDescriptorFilter filter) {
  		Assert.isNotNull(element);
  		Assert.isNotNull(args);
  		fRename.add(element);
  		fRenameArguments.add(args);
  		fParticipantDescriptorFilter.add(filter);
  	}
  	
  	private void addAllResourceModifications(IPackageFragment rootPackage, RenameArguments args, boolean renameSubPackages, IPackageFragment[] allSubPackages) throws CoreException {
  		addResourceModifications(rootPackage, args, rootPackage, renameSubPackages);
  		if (renameSubPackages) {
  			for (int i= 0; i < allSubPackages.length; i++) {
  				IPackageFragment pack= allSubPackages[i];
  				addResourceModifications(rootPackage, args, pack, renameSubPackages);
  			}
  		}
  	}
  	
  	private void addResourceModifications(IPackageFragment rootPackage, RenameArguments args, IPackageFragment pack, boolean renameSubPackages) throws CoreException {
  		IContainer container= (IContainer)pack.getResource();
  		if (container == null)
  			return;
  		IFolder target= computeTargetFolder(rootPackage, args, pack);
  		createIncludingParents(target);
  		MoveArguments arguments= new MoveArguments(target, args.getUpdateReferences());
  		IResource[] resourcesToMove= collectResourcesOfInterest(pack);
  		Set allMembers= new HashSet(Arrays.asList(container.members()));
  		for (int i= 0; i < resourcesToMove.length; i++) {
  			IResource toMove= resourcesToMove[i];
  			getResourceModifications().addMove(toMove, arguments);
  			allMembers.remove(toMove);
  		}
  		for (Iterator iter= allMembers.iterator(); iter.hasNext();) {
  			IResource element= (IResource) iter.next();
  			if (element instanceof IFile) {
  				getResourceModifications().addDelete(element);
  				iter.remove();
  			}
  		}
  		if (renameSubPackages && rootPackage.equals(pack)
  				|| ! renameSubPackages && allMembers.isEmpty()) {
  			getResourceModifications().addDelete(container);
  		}
  	}
  
  	private boolean canMove(IContainer source, IContainer target) {
  		return !target.exists() && !source.getFullPath().isPrefixOf(target.getFullPath());
  	}
  
  	private IPackageFragment[] getSubpackages(IPackageFragment pack) throws CoreException {
  		IPackageFragmentRoot root= (IPackageFragmentRoot) pack.getParent();
  		IJavaScriptElement[] allPackages= root.getChildren();
  		if (pack.isDefaultPackage())
  			return new IPackageFragment[0];
  		ArrayList result= new ArrayList();
  		String prefix= pack.getElementName() + '.';
  		for (int i= 0; i < allPackages.length; i++) {
  			IPackageFragment currentPackage= (IPackageFragment) allPackages[i];
  			if (currentPackage.getElementName().startsWith(prefix))
  				result.add(currentPackage);
  		}
  		return (IPackageFragment[]) result.toArray(new IPackageFragment[result.size()]);
  	}
  	
  	private IFolder computeTargetFolder(IPackageFragment rootPackage, RenameArguments args, IPackageFragment pack) {
  		IPath path= pack.getParent().getPath();
  		path= path.append(getNewPackageName(rootPackage, args.getNewName(),  pack.getElementName()).replace('.', IPath.SEPARATOR));
  		IFolder target= ResourcesPlugin.getWorkspace().getRoot().getFolder(path);
  		return target;
  	}
  	
  	private String getNewPackageName(IPackageFragment rootPackage, String newPackageName, String oldSubPackageName) {
  		String oldPackageName= rootPackage.getElementName();
  		return newPackageName + oldSubPackageName.substring(oldPackageName.length());
  	}
  } 
  