Activator.java

/*******************************************************************************
 * Copyright (c) 2017 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:
 * - William Piers <william.piers@obeo.fr>
 *******************************************************************************/
package org.occiware.clouddesigner.occi.examples;

import java.net.URL;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 *
 * @author William Piers
 *         <a href="mailto:william.piers@obeo.fr">william.piers@obeo.fr</a>
 */
public class Activator extends AbstractUIPlugin {
	// The plug-in ID
	public static final String PLUGIN_ID = "org.occiware.clouddesigner.occi.examples"; //$NON-NLS-1$

	// 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);
		plugin = this;
	}

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

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

	public Image getImage(String key) {
		Image image = getImageRegistry().get(key);
		if (image == null) {
			image = registerImage(key);
		}
		return image;
	}

	private Image registerImage(String key) {
		try {
			IPath path = new Path("images/" + key); //$NON-NLS-1$
			URL url = FileLocator.find(this.getBundle(), path, null);
			if (url != null) {
				ImageDescriptor desc = ImageDescriptor.createFromURL(url);
				getImageRegistry().put(key, desc);
				return getImageRegistry().get(key);
			}
		} catch (Exception e) {
			// ignored
		}
		return null;
	}
}