Activator.java

/*******************************************************************************
 * Copyright (c) 2008 Hallvard Traetteberg.
 * 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:
 *     Hallvard Traetteberg - initial API and implementation
 ******************************************************************************/
package org.eclipse.e4.tm.ui;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
import org.eclipse.e4.tm.ui.editor.IPostProcessor;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 */
public class Activator extends AbstractUIPlugin {

	// The plug-in ID
	public static final String PLUGIN_ID = "org.eclipse.e4.tm.ui";

	// The shared instance
	private static Activator plugin;

	/**
	 * The constructor
	 */
	public Activator() {
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);
		Activator.plugin = this;
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext context) throws Exception {
		Activator.plugin = null;
		super.stop(context);
	}

	/**
	 * Returns the shared instance
	 *
	 * @return the shared instance
	 */
	public static Activator getDefault() {
		return Activator.plugin;
	}

	private List<IPostProcessor> postProcessors = null;
	
	private void processPostProcessModelExtensionPoint() {
		IExtensionPoint ep = Platform.getExtensionRegistry().getExtensionPoint(getBundle().getSymbolicName(), "postProcessor");
		IExtension[] extensions = ep.getExtensions();
		for (int i = 0; i < extensions.length; i++) {
			for (IConfigurationElement ces: extensions[i].getConfigurationElements()) {
				String name = ces.getName();
				if ("postProcessor".equals(name)) {
					processPostProcessModelElement(ces);
				}
			}
		} 
	}

	private void processPostProcessModelElement(IConfigurationElement ces) {
		try {
			IPostProcessor postModelProcessor = (IPostProcessor)ces.createExecutableExtension("postProcessorClass");
			postProcessors.add(postModelProcessor);
		} catch (CoreException e) {
			System.err.println("Couldn't create a IPostProcessModel for " + ces.getAttribute("postProcessorClass"));
		}
	}
	
	public IPostProcessor[] getPostProcessors() {
		if (postProcessors == null) {
			postProcessors = new ArrayList<IPostProcessor>();
			processPostProcessModelExtensionPoint();
		}
		return postProcessors.toArray(new IPostProcessor[postProcessors.size()]);
 	}
}