org.eclipse.opencert.elastic.ui/src/org/eclipse/opencert/elastic/ui/Activator.java

/*******************************************************************************
 * Copyright (C) 2017 ANSYS medini Technologies AG
 * 
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 * 
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors: 
 * 	ANSYS medini Technologies AG - initial API and implementation
 ******************************************************************************/
package org.eclipse.opencert.elastic.ui;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * Public bundle activator, no special..
 */
public class Activator extends AbstractUIPlugin {

	/**
	 * The plug-in ID
	 */
	public static final String PLUGIN_ID = "org.eclipse.opencert.elastic.ui"; //$NON-NLS-1$

	// The shared instance
	private static Activator plugin;

	@Override
	public void start(BundleContext context) throws Exception {
		super.start(context);
		plugin = this;
	}

	@Override
	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;
	}

	/**
	 * Returns the image for the given key or null.
	 *
	 * @param imagePath
	 *            relative image path
	 * @return an Image or null
	 */
	public Image getImage(String imagePath) {
		ImageRegistry imageRegistry = super.getImageRegistry();
		// the path is treated as unique key
		Image image = imageRegistry.get(imagePath);
		if (image == null) {
			ImageDescriptor descriptor = Activator.imageDescriptorFromPlugin(PLUGIN_ID, imagePath);
			image = descriptor.createImage();
			imageRegistry.put(imagePath, image);
			return image;
		}
		return image;
	}

}