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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) 2000, 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.boot;

import java.io.IOException;
import java.net.URL;
import org.eclipse.core.internal.runtime.CommonMessages;
import org.eclipse.osgi.util.NLS;

/**
 * Platform URL support
 * platform:/base/	maps to platform installation location
 */
public class PlatformURLBaseConnection extends PlatformURLConnection {

	// platform/ protocol
	public static final String PLATFORM = "base"; //$NON-NLS-1$
	public static final String PLATFORM_URL_STRING = PlatformURLHandler.PROTOCOL + PlatformURLHandler.PROTOCOL_SEPARATOR + "/" + PLATFORM + "/"; //$NON-NLS-1$ //$NON-NLS-2$

	private static URL installURL;

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

	@Override
	protected boolean allowCaching() {
		return true;
	}

	@Override
	protected URL resolve() throws IOException {
		String spec = url.getFile().trim();
		if (spec.startsWith("/")) //$NON-NLS-1$
			spec = spec.substring(1);
		if (!spec.startsWith(PLATFORM + "/")) { //$NON-NLS-1$
			String message = NLS.bind(CommonMessages.url_badVariant, url);
			throw new IOException(message);
		}
		return spec.length() == PLATFORM.length() + 1 ? installURL : new URL(installURL, spec.substring(PLATFORM.length() + 1));
	}

	public static void startup(URL url) {
		// register connection type for platform:/base/ handling
		if (installURL != null)
			return;
		installURL = url;
		PlatformURLHandler.register(PLATFORM, PlatformURLBaseConnection.class);
	}
}