JavaElementListener.java

/*******************************************************************************
 * Copyright (c) 2010, 2011 Obeo.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.mylyn.docs.intent.bridge.java.listeners;

import java.util.Set;

import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.emf.common.util.URI;
import org.eclipse.mylyn.docs.intent.bridge.java.util.JavaBridgeUtils;
import org.eclipse.mylyn.docs.intent.client.synchronizer.SynchronizerRepositoryClient;
import org.eclipse.mylyn.docs.intent.client.synchronizer.api.contribution.ISynchronizerExtension;
import org.eclipse.mylyn.docs.intent.client.ui.ide.generatedelementlistener.IDEGeneratedElementListener;

/**
 * A {@link IDEGeneratedElementListener} in charge of launching the synchronizer when java files referenced
 * inside an Intent document have changed.
 * 
 * @author <a href="mailto:alex.lagarde@obeo.fr">Alex Lagarde</a>
 */
public class JavaElementListener extends IDEGeneratedElementListener implements ISynchronizerExtension, IResourceChangeListener {

	/**
	 * JavaElementListener constructor.
	 */
	public JavaElementListener() {
		super();
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @see org.eclipse.mylyn.docs.intent.client.synchronizer.api.contribution.ISynchronizerExtension#isExtensionFor(org.eclipse.emf.common.util.URI)
	 */
	public boolean isExtensionFor(URI uri) {
		return JavaBridgeUtils.isHandledByJavaBridge(uri);
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @see org.eclipse.mylyn.docs.intent.client.synchronizer.api.contribution.ISynchronizerExtension#addListenedElements(org.eclipse.mylyn.docs.intent.client.synchronizer.SynchronizerRepositoryClient,
	 *      java.util.Set)
	 */
	public void addListenedElements(SynchronizerRepositoryClient synchronizerClient,
			Set<URI> listenedElementsURIs) {
		this.synchronizer = synchronizerClient;
		for (URI listenedElementURI : listenedElementsURIs) {
			addElementToListen(transformToJavaURI(listenedElementURI));
		}
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @see org.eclipse.mylyn.docs.intent.client.synchronizer.api.contribution.ISynchronizerExtension#removeListenedElements(org.eclipse.mylyn.docs.intent.client.synchronizer.SynchronizerRepositoryClient,
	 *      java.util.Set)
	 */
	public void removeListenedElements(SynchronizerRepositoryClient synchronizer,
			Set<URI> listenedElementsURIs) {
		for (URI listenedElementURI : listenedElementsURIs) {
			removeElementToListen(transformToJavaURI(listenedElementURI));
		}
	}

	/**
	 * Returns the {@link URI} corresponding to the .class of the java element to listen (we only want to be
	 * notified once the class has been compiled).
	 * 
	 * @param listenedElementURI
	 *            the listenedElementURI as defined in the Resource or ExternalContentReference
	 * @return the {@link URI} corresponding to the .class of the java element to listen (we only want to be
	 *         notified once the class has been compiled)
	 */
	private URI transformToJavaURI(URI listenedElementURI) {
		URI javaFileURI = URI.createPlatformResourceURI(listenedElementURI.trimFragment().toString(), false);
		String javaClassURI = javaFileURI.toString().replace("src", "bin");
		if (javaClassURI.lastIndexOf(".java") != -1) {
			javaClassURI = javaClassURI.substring(0, javaClassURI.length() - 5) + ".class";
		}
		return URI.createURI(javaClassURI);
	}

}