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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, 2014 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.resources;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLDecoder;
import org.eclipse.core.internal.boot.PlatformURLConnection;
import org.eclipse.core.internal.boot.PlatformURLHandler;
import org.eclipse.core.internal.utils.Messages;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.osgi.util.NLS;

/**
 * Platform URL support {@literal platform:/resource//} maps to
 * resource in current workspace
 */
public class PlatformURLResourceConnection extends PlatformURLConnection {

	// resource/ protocol
	public static final String RESOURCE = "resource"; //$NON-NLS-1$
	public static final String RESOURCE_URL_STRING = PlatformURLHandler.PROTOCOL + PlatformURLHandler.PROTOCOL_SEPARATOR + '/' + RESOURCE + '/';
	private static URL rootURL;

	public PlatformURLResourceConnection(URL url) {
		super(url);
	}

	@Override
	protected boolean allowCaching() {
		return false; // don't cache, workspace is local
	}

	@Override
	protected URL resolve() throws IOException {
		String filePath = url.getFile().trim();
		filePath = URLDecoder.decode(filePath, "UTF-8"); //$NON-NLS-1$
		IPath spec = IPath.fromOSString(filePath).makeRelative();
		if (!spec.segment(0).equals(RESOURCE))
			throw new IOException(NLS.bind(Messages.url_badVariant, url));
		int count = spec.segmentCount();
		// if there is only one segment then we are talking about the workspace root.
		if (count == 1)
			return rootURL;
		// if there are two segments then the second is a project name.
		IProject project = ResourcesPlugin.getWorkspace().getRoot().getProject(spec.segment(1));
		if (!project.exists()) {
			String message = NLS.bind(Messages.url_couldNotResolve_projectDoesNotExist, project.getName(), url.toExternalForm());
			throw new IOException(message);
		}

		IResource resource = null;
		if (count == 2) {
			resource = project;
		} else {
			spec = spec.removeFirstSegments(2);
			resource = project.getFile(spec);
		}

		IPath result = resource.getLocation();

		if (result == null) {
			URI uri = resource.getLocationURI();
			if (uri != null) {
				try {
					URL url2 = uri.toURL();
					if (url2.getProtocol().equals("file")) //$NON-NLS-1$
						return url2;
				} catch (MalformedURLException e) {
					String message = NLS.bind(Messages.url_couldNotResolve_URLProtocolHandlerCanNotResolveURL, uri.toString(), url.toExternalForm());
					throw new IOException(message);
				}
			}
			String message = NLS.bind(Messages.url_couldNotResolve_resourceLocationCanNotBeDetermined, resource.getFullPath(), url.toExternalForm());
			throw new IOException(message);
		}
		return new URL("file", "", result.toString()); //$NON-NLS-1$ //$NON-NLS-2$
	}

	/**
	 * This method is called during resource plugin startup() initialization.
	 *
	 * @param root URL to the root of the current workspace.
	 */
	public static void startup(IPath root) {
		// register connection type for platform:/resource/ handling
		if (rootURL != null)
			return;
		try {
			rootURL = root.toFile().toURL();
		} catch (MalformedURLException e) {
			// should never happen but if it does, the resource URL cannot be supported.
			return;
		}
		PlatformURLHandler.register(RESOURCE, PlatformURLResourceConnection.class);
	}
}