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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) 2004, 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
 *******************************************************************************/
package org.eclipse.core.internal.runtime;

import java.io.*;
import java.net.URL;
import org.eclipse.core.internal.boot.PlatformURLConnection;
import org.eclipse.core.internal.boot.PlatformURLHandler;
import org.eclipse.core.runtime.IPath;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.Bundle;

public class PlatformURLMetaConnection extends PlatformURLConnection {
	private Bundle target = null;
	private static boolean isRegistered = false;
	public static final String META = "meta"; //$NON-NLS-1$

	/*
	 * Constructor for the class.
	 */
	public PlatformURLMetaConnection(URL url) {
		super(url);
	}

	@Override
	protected URL resolve() throws IOException {
		String spec = url.getFile().trim();
		if (spec.startsWith("/")) //$NON-NLS-1$
			spec = spec.substring(1);
		if (!spec.startsWith(META))
			throw new IOException(NLS.bind(CommonMessages.url_badVariant, url.toString()));
		int ix = spec.indexOf('/', META.length() + 1);
		String ref = ix == -1 ? spec.substring(META.length() + 1) : spec.substring(META.length() + 1, ix);
		String id = getId(ref);
		Activator activator = Activator.getDefault();
		if (activator == null)
			throw new IOException(CommonMessages.activator_not_available);
		target = activator.getBundle(id);
		if (target == null)
			throw new IOException(NLS.bind(CommonMessages.url_resolvePlugin, url.toString()));
		IPath path = MetaDataKeeper.getMetaArea().getStateLocation(target);
		if (ix != -1 || (ix + 1) <= spec.length())
			path = path.append(spec.substring(ix + 1));
		return path.toFile().toURL();
	}

	public static void startup() {
		// register connection type for platform:/meta handling
		if (isRegistered)
			return;
		PlatformURLHandler.register(META, PlatformURLMetaConnection.class);
		isRegistered = true;
	}

	@Override
	public OutputStream getOutputStream() throws IOException {
		//This is not optimal but connection is a private instance variable in super.
		URL resolved = getResolvedURL();
		if (resolved != null) {
			String fileString = resolved.getFile();
			if (fileString != null) {
				File file = new File(fileString);
				String parent = file.getParent();
				if (parent != null)
					new File(parent).mkdirs();
				return new FileOutputStream(file);
			}
		}
		return null;
	}
}