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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) 2007, 2022 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
 *     Christoph Läubrich - Issue #62 - regression from Bug 550548
 *******************************************************************************/
package org.eclipse.core.internal.filesystem;

import java.io.File;
import java.net.URL;
import java.util.Collections;
import java.util.Enumeration;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.osgi.service.datalocation.Location;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.util.tracker.ServiceTracker;

/**
 * This class abstracts away implementation details of the filesystem
 * bundle that depend on the OSGi framework being started. All
 * file system bundle functionality is enabled regardless of whether
 * OSGi is running.
 * @since org.eclipse.core.filesystem 1.1
 */
public class FileSystemAccess {

	/**
	 * Returns the local file system location that should be used for
	 * caching file data.
	 */
	public static IPath getCacheLocation() {
		//try to put the cache in the instance location if possible (3.2 behaviour)
		try {
			Bundle bundle = FrameworkUtil.getBundle(FileSystemAccess.class);
			if (bundle != null) {
				BundleContext context = bundle.getBundleContext();
				if (context != null) {
					ServiceTracker tracker = new ServiceTracker<>(context, context.createFilter(Location.INSTANCE_FILTER), null);
					tracker.open();
					try {
						Location location = tracker.getService();
						if (location != null) {
							IPath instancePath = IPath.fromOSString(new File(location.getURL().getFile()).toString());
							return instancePath.append(".metadata/.plugins").append(Policy.PI_FILE_SYSTEM); //$NON-NLS-1$
						}
					} finally {
						tracker.close();
					}
				}
			}
		} catch (InvalidSyntaxException e) {
			Policy.log(IStatus.INFO, null, e);
			//fall through below and use user home
		}
		//just put the cache in the user home directory
		return IPath.fromOSString(System.getProperty("user.home")); //$NON-NLS-1$
	}

	public static Enumeration findEntries(String path, String filePattern, boolean recurse) {
		Bundle bundle = FrameworkUtil.getBundle(FileSystemAccess.class);
		if (bundle != null) {
			return bundle.findEntries(path, filePattern, recurse);
		}
		return Collections.emptyEnumeration();
	}

}