content: /*******************************************************************************
   * Copyright (c) 2000, 2007 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.changes;
  
  import org.eclipse.core.resources.IResource;
  import org.eclipse.core.resources.ResourcesPlugin;
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.IPath;
  import org.eclipse.core.runtime.IProgressMonitor;
  import org.eclipse.ltk.core.refactoring.Change;
  import org.eclipse.ltk.core.refactoring.ChangeDescriptor;
  import org.eclipse.ltk.core.refactoring.RefactoringChangeDescriptor;
  import org.eclipse.ltk.core.refactoring.RefactoringDescriptor;
  import org.eclipse.ltk.core.refactoring.RefactoringStatus;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.RefactoringCoreMessages;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.base.JDTChange;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  
  public final class RenameResourceChange extends JDTChange {
  
  	public static IPath renamedResourcePath(IPath path, String newName) {
  		return path.removeLastSegments(1).append(newName);
  	}
  
  	private final String fComment;
  
  	private final RefactoringDescriptor fDescriptor;
  
  	private final String fNewName;
  
  	private final IPath fResourcePath;
  
  	private final long fStampToRestore;
  
  	private RenameResourceChange(RefactoringDescriptor descriptor, IPath resourcePath, String newName, String comment, long stampToRestore) {
  		fDescriptor= descriptor;
  		fResourcePath= resourcePath;
  		fNewName= newName;
  		fComment= comment;
  		fStampToRestore= stampToRestore;
  	}
  
  	public RenameResourceChange(RefactoringDescriptor descriptor, IResource resource, String newName, String comment) {
  		this(descriptor, resource.getFullPath(), newName, comment, IResource.NULL_STAMP);
  	}
  
  	public ChangeDescriptor getDescriptor() {
  		if (fDescriptor != null)
  			return new RefactoringChangeDescriptor(fDescriptor);
  		return null;
  	}
  
  	public Object getModifiedElement() {
  		return getResource();
  	}
  
  	public String getName() {
  		return Messages.format(RefactoringCoreMessages.RenameResourceChange_name, new String[] { fResourcePath.toString(), fNewName});
  	}
  
  	public String getNewName() {
  		return fNewName;
  	}
  
  	private IResource getResource() {
  		return ResourcesPlugin.getWorkspace().getRoot().findMember(fResourcePath);
  	}
  
  	public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException {
  		IResource resource= getResource();
  		if (resource == null || !resource.exists()) {
  			return RefactoringStatus.createFatalErrorStatus(Messages.format(RefactoringCoreMessages.RenameResourceChange_does_not_exist, fResourcePath.toString()));
  		} else {
  			return super.isValid(pm, DIRTY);
  		}
  	}
  
  	public Change perform(IProgressMonitor pm) throws CoreException {
  		try {
  			pm.beginTask(RefactoringCoreMessages.RenameResourceChange_rename_resource, 1);
  
  			IResource resource= getResource();
  			long currentStamp= resource.getModificationStamp();
  			IPath newPath= renamedResourcePath(fResourcePath, fNewName);
  			resource.move(newPath, IResource.SHALLOW, pm);
  			if (fStampToRestore != IResource.NULL_STAMP) {
  				IResource newResource= ResourcesPlugin.getWorkspace().getRoot().findMember(newPath);
  				newResource.revertModificationStamp(fStampToRestore);
  			}
  			String oldName= fResourcePath.lastSegment();
  			return new RenameResourceChange(null, newPath, oldName, fComment, currentStamp);
  		} finally {
  			pm.done();
  		}
  	}
  }
  