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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
 *******************************************************************************/
package org.eclipse.core.internal.runtime;

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import org.eclipse.core.internal.boot.PlatformURLConnection;
import org.eclipse.core.internal.boot.PlatformURLHandler;
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.osgi.service.urlconversion.URLConverter;

/**
 * Class which implements the URLConverter service. Manages conversion of a 
 * platform: URL to one with a more well known protocol.
 * 
 * @since 3.2
 */
public class PlatformURLConverter implements URLConverter {

	@Override
	public URL toFileURL(URL url) throws IOException {
		URLConnection connection = url.openConnection();
		if (!(connection instanceof PlatformURLConnection))
			return url;
		URL result = ((PlatformURLConnection) connection).getURLAsLocal();
		// if we have a bundle*: URL we should try to convert it
		if (!result.getProtocol().startsWith(PlatformURLHandler.BUNDLE))
			return result;
		return FileLocator.toFileURL(result);
	}

	@Override
	public URL resolve(URL url) throws IOException {
		URLConnection connection = url.openConnection();
		if (!(connection instanceof PlatformURLConnection))
			return url;
		URL result = ((PlatformURLConnection) connection).getResolvedURL();
		// if we have a bundle*: URL we should try to convert it
		if (!result.getProtocol().startsWith(PlatformURLHandler.BUNDLE))
			return result;
		return FileLocator.resolve(result);
	}
}