bundles/org.eclipse.emf.ecp.emfstore.ui/src/org/eclipse/emf/ecp/emfstore/internal/ui/Activator.java

/*******************************************************************************
 * Copyright (c) 2011-2012 EclipseSource Muenchen GmbH and others.
 * 
 * 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:
 * Eugen Neufeld - initial API and implementation
 * 
 *******************************************************************************/
package org.eclipse.emf.ecp.emfstore.internal.ui;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.resource.ImageDescriptor;
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.emf.ecp.emfstore.ui"; //$NON-NLS-1$

	private static Activator instance;

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

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

	@Override
	public void stop(BundleContext context) throws Exception {
		instance = null;
		super.stop(context);
	}

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

	private static void log(IStatus status) {
		instance.getLog().log(status);
	}

	/**
	 * Logs a message with a specific status.
	 * 
	 * @param status the {@link IStatus} value
	 * @param message the message to log
	 */
	public static void log(int status, String message) {
		instance.getLog().log(new Status(status, PLUGIN_ID, message));
	}

	/**
	 * Logs a {@link Throwable}.
	 * 
	 * @param t the {@link Throwable}
	 * @return the message of the {@link Throwable}
	 */
	public static String log(Throwable t) {
		IStatus status = getStatus(t);
		log(status);
		return status.getMessage();
	}

	private static IStatus getStatus(Throwable t) {
		if (t instanceof CoreException) {
			CoreException coreException = (CoreException) t;
			return coreException.getStatus();
		}

		String msg = t.getLocalizedMessage();
		if (msg == null || msg.length() == 0) {
			msg = t.getClass().getName();
		}

		return new Status(IStatus.ERROR, PLUGIN_ID, msg, t);
	}

	/**
	 * Returns an {@link ImageDescriptor} based on a path from this plugin.
	 * This is a wrapper for {@link AbstractUIPlugin#imageDescriptorFromPlugin(String, String)}.
	 * 
	 * @param path the relative path of the image file, relative to the root of the plug-in; the path must be legal
	 * @return an image descriptor, or null if no image could be found
	 */
	public static ImageDescriptor getImageDescriptor(String path) {
		return imageDescriptorFromPlugin(PLUGIN_ID, path);
	}
}