RestartPluginImages.java

/*******************************************************************************
 * Copyright (c) 2016 Pivotal, Inc.
 * 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:
 *     Phil Webb - initial API and implementation
 *******************************************************************************/
package org.springframework.ide.eclipse.boot.restart;

import java.net.URL;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.PlatformUI;
import org.osgi.framework.Bundle;

public class RestartPluginImages {

	private static ImageRegistry imageRegistry;

	private static String ICONS_PATH = "$nl$/icons/full/"; //$NON-NLS-1$

	private static void declareImages() {
		declareRegistryImage(RestartConstants.IMG_RESTART_ICON, ICONS_PATH
				+ "refresh_tab.png"); //$NON-NLS-1$
	}

	private final static void declareRegistryImage(String key, String path) {
		ImageDescriptor desc = ImageDescriptor.getMissingImageDescriptor();
		Bundle bundle = Platform.getBundle(RestartConstants.PLUGIN_ID);
		URL url = null;
		if (bundle != null) {
			url = FileLocator.find(bundle, new Path(path), null);
			if (url != null) {
				desc = ImageDescriptor.createFromURL(url);
			}
		}
		imageRegistry.put(key, desc);
	}

	public static ImageRegistry getImageRegistry() {
		if (imageRegistry == null) {
			initializeImageRegistry();
		}
		return imageRegistry;
	}

	public synchronized static boolean isInitialized() {
		return imageRegistry != null;
	}

	public synchronized static ImageRegistry initializeImageRegistry() {
		if (imageRegistry == null) {
			imageRegistry = new ImageRegistry(PlatformUI.getWorkbench().getDisplay());
			declareImages();
		}
		return imageRegistry;
	}

	public static Image getImage(String key) {
		return getImageRegistry().get(key);
	}

	public static ImageDescriptor getImageDescriptor(String key) {
		return getImageRegistry().getDescriptor(key);
	}

}