/*******************************************************************************
* 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.core.internal.resources.mapping;
import java.util.*;
import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.IPath;
/**
* A description of the changes found in a delta
*/
public class ChangeDescription {
private List addedRoots= new ArrayList();
private List changedFiles= new ArrayList();
private List closedProjects= new ArrayList();
private List copiedRoots= new ArrayList();
private List movedRoots= new ArrayList();
private List removedRoots= new ArrayList();
private IResource createSourceResource(IResourceDelta delta) {
IPath sourcePath= delta.getMovedFromPath();
IResource resource= delta.getResource();
IWorkspaceRoot wsRoot= ResourcesPlugin.getWorkspace().getRoot();
switch (resource.getType()) {
case IResource.PROJECT:
return wsRoot.getProject(sourcePath.segment(0));
case IResource.FOLDER:
return wsRoot.getFolder(sourcePath);
case IResource.FILE:
return wsRoot.getFile(sourcePath);
}
return null;
}
private void ensureResourceCovered(IResource resource, List list) {
IPath path= resource.getFullPath();
for (Iterator iter= list.iterator(); iter.hasNext();) {
IResource root= (IResource)iter.next();
if (root.getFullPath().isPrefixOf(path)) {
return;
}
}
list.add(resource);
}
public IResource[] getRootResources() {
Set result= new HashSet();
result.addAll(addedRoots);
result.addAll(changedFiles);
result.addAll(closedProjects);
result.addAll(copiedRoots);
result.addAll(movedRoots);
result.addAll(removedRoots);
return (IResource[])result.toArray(new IResource[result.size()]);
}
private void handleAdded(IResourceDelta delta) {
if ((delta.getFlags() & IResourceDelta.MOVED_FROM) != 0) {
handleMove(delta);
} else if ((delta.getFlags() & IResourceDelta.COPIED_FROM) != 0) {
handleCopy(delta);
} else {
ensureResourceCovered(delta.getResource(), addedRoots);
}
}
private void handleChange(IResourceDelta delta) {
if ((delta.getFlags() & IResourceDelta.REPLACED) != 0) {
// A replace was added in place of a removed resource
handleAdded(delta);
} else if (delta.getResource().getType() == IResource.FILE) {
ensureResourceCovered(delta.getResource(), changedFiles);
}
}
private void handleCopy(IResourceDelta delta) {
if ((delta.getFlags() & IResourceDelta.COPIED_FROM) != 0) {
IResource source= createSourceResource(delta);
ensureResourceCovered(source, copiedRoots);
}
}
private void handleMove(IResourceDelta delta) {
if ((delta.getFlags() & IResourceDelta.MOVED_TO) != 0) {
movedRoots.add(delta.getResource());
} else if ((delta.getFlags() & IResourceDelta.MOVED_FROM) != 0) {
IResource source= createSourceResource(delta);
ensureResourceCovered(source, movedRoots);
}
}
private void handleRemoved(IResourceDelta delta) {
if ((delta.getFlags() & IResourceDelta.OPEN) != 0) {
closedProjects.add(delta.getResource());
} else if ((delta.getFlags() & IResourceDelta.MOVED_TO) != 0) {
handleMove(delta);
} else {
ensureResourceCovered(delta.getResource(), removedRoots);
}
}
/**
* Record the change and return whether any child changes should be visited.
*
* @param delta the change
* @return whether any child changes should be visited
*/
public boolean recordChange(IResourceDelta delta) {
switch (delta.getKind()) {
case IResourceDelta.ADDED:
handleAdded(delta);
return true; // Need to traverse children to look for moves or other changes under added roots
case IResourceDelta.REMOVED:
handleRemoved(delta);
// No need to look for further changes under a remove (such as moves).
// Changes will be discovered in corresponding destination delta
return false;
case IResourceDelta.CHANGED:
handleChange(delta);
return true;
}
return true;
}
}