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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2006, 2015 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
 *     James Blackburn (Broadcom Corp.) - ongoing development
 *     Lars Vogel  - Bug 473427
 *******************************************************************************/
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 (IResource root : list) {
			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 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;
	}

}