/*****************************************************************************
 * Copyright (c) 2010 CEA LIST.
 *
 * 
 * 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:
 *  Patrick Tessier (CEA LIST) Patrick.tessier@cea.fr - Initial API and implementation
 */
package org.eclipse.papyrus.infra.gmfdiag.navigation;

import org.eclipse.papyrus.infra.gmfdiag.navigation.preference.NavigationPreferenceInitializer;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

public class Activator extends AbstractUIPlugin {

	// The plug-in ID
	public static final String PLUGIN_ID = "org.eclipse.papyrus.infra.gmfdiag.navigation"; //$NON-NLS-1$

	// The shared instance
	private static Activator plugin;

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

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.core.runtime.Plugins#start(org.osgi.framework.BundleContext)
	 */
	@Override
	public void start(BundleContext context) throws Exception {
		super.start(context);
		plugin = this;
		NavigationPreferenceInitializer preferenceInitializer = new NavigationPreferenceInitializer();
		preferenceInitializer.initializeDefaultPreferences();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.core.runtime.Plugin#stop(org.osgi.framework.BundleContext)
	 */
	@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 active workbench shell
	 * 
	 * @return the active workbench shell
	 */
	public static Shell getActiveWorkbenchShell() {
		IWorkbenchWindow workBenchWindow = getActiveWorkbenchWindow();
		if(workBenchWindow == null) {
			return null;
		}
		return workBenchWindow.getShell();
	}

	/**
	 * Returns the active workbench window
	 * 
	 * @return the active workbench window
	 */
	public static IWorkbenchWindow getActiveWorkbenchWindow() {
		if(getDefault() == null) {
			return null;
		}
		IWorkbench workBench = getDefault().getWorkbench();
		if(workBench == null) {
			return null;
		}
		return workBench.getActiveWorkbenchWindow();
	}

}