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.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.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.OperationCanceledException;
  import org.eclipse.core.runtime.SubProgressMonitor;
  import org.eclipse.ltk.core.refactoring.Change;
  import org.eclipse.ltk.core.refactoring.participants.ReorgExecutionLog;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.base.JDTChange;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.INewNameQuery;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.ReorgUtils;
  
  abstract class ResourceReorgChange extends JDTChange {
  	
  	private final IPath fResourcePath;
  	private final boolean fIsFile;
  	private final IPath fDestinationPath;
  	private final boolean fIsDestinationProject;
  	private final INewNameQuery fNewNameQuery;
  
  	ResourceReorgChange(IResource res, IContainer dest, INewNameQuery nameQuery){
  		Assert.isTrue(res instanceof IFile || res instanceof IFolder);
  		fIsFile= (res instanceof IFile);
  		fResourcePath= Utils.getResourcePath(res);
  	
  		Assert.isTrue(dest instanceof IProject || dest instanceof IFolder);
  		fIsDestinationProject= (dest instanceof IProject);
  		fDestinationPath= Utils.getResourcePath(dest);
  		fNewNameQuery= nameQuery;
  	}
  	
  	protected abstract Change doPerformReorg(IPath path, IProgressMonitor pm) throws CoreException;
  	
  	/* non java-doc
  	 * @see IChange#perform(ChangeContext, IProgressMonitor)
  	 */
  	public final Change perform(IProgressMonitor pm) throws CoreException, OperationCanceledException {
  		try{
  			pm.beginTask(getName(), 2);
  			
  			String newName= getNewResourceName();
  			IResource resource= getResource();
  			boolean performReorg= deleteIfAlreadyExists(new SubProgressMonitor(pm, 1), newName);
  			if (!performReorg)
  				return null;
  			final Change result= doPerformReorg(getDestinationPath(newName), new SubProgressMonitor(pm, 1));
  			markAsExecuted(resource);
  			return result;
  		} finally {
  			pm.done();
  		}
  	}
  
  	protected IPath getDestinationPath(String newName) {
  		return getDestination().getFullPath().append(newName);
  	}
  
  	/**
  	 * returns false if source and destination are the same (in workspace or on disk)
  	 * in such case, no action should be performed
  	 */
  	private boolean deleteIfAlreadyExists(IProgressMonitor pm, String newName) throws CoreException {
  		pm.beginTask("", 1); //$NON-NLS-1$
  		IResource current= getDestination().findMember(newName);
  		if (current == null)
  			return true;
  		if (! current.exists())
  			return true;
  
  		IResource resource= getResource();
  		Assert.isNotNull(resource);
  			
  		if (ReorgUtils.areEqualInWorkspaceOrOnDisk(resource, current))
  			return false;
  		
  		if (current instanceof IFile)
  			((IFile)current).delete(false, true, new SubProgressMonitor(pm, 1));
  		else if (current instanceof IFolder)
  			((IFolder)current).delete(false, true, new SubProgressMonitor(pm, 1));
  		else 
  			Assert.isTrue(false);
  			
  		return true;	
  	}
  	
  
  	private String getNewResourceName() throws OperationCanceledException {
  		if (fNewNameQuery == null)
  			return getResource().getName();
  		String name= fNewNameQuery.getNewName();
  		if (name == null)
  			return getResource().getName();
  		return name;
  	}
  	
  	/* non java-doc
  	 * @see IChange#getModifiedLanguageElement()
  	 */
  	public Object getModifiedElement() {
  		return getResource();
  	}
  
  	private IFile getFile(){
  		return Utils.getFile(fResourcePath);
  	}
  	
  	private IFolder getFolder(){
  		return Utils.getFolder(fResourcePath);
  	}
  	
  	protected IResource getResource(){
  		if (fIsFile)
  			return getFile();
  		else
  			return getFolder();
  	}
  	
  	IContainer getDestination(){
  		if (fIsDestinationProject)
  			return Utils.getProject(fDestinationPath);
  		else
  			return Utils.getFolder(fDestinationPath);	
  	}
  
  	protected int getReorgFlags() {
  		return IResource.KEEP_HISTORY | IResource.SHALLOW;
  	}
  	
  	private void markAsExecuted(IResource resource) {
  		ReorgExecutionLog log= (ReorgExecutionLog)getAdapter(ReorgExecutionLog.class);
  		if (log != null) {
  			log.markAsProcessed(resource);
  		}
  	}
  }
  
  