/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.hibernate.eclipse.help;


import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;


/**
 * The main plugin class to be used in the desktop.
 */
public class HelpPlugin extends AbstractUIPlugin {
	//The shared instance.
	private static HelpPlugin plugin;
	//Resource bundle.
	private ResourceBundle resourceBundle;
	
	/**
	 * The constructor.
	 */
	public HelpPlugin() {
		super();
		setPlugin(this);
	}

	/**
	 * This method is called upon plug-in activation
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);
	}

	/**
	 * This method is called when the plug-in is stopped
	 */
	public void stop(BundleContext context) throws Exception {
		super.stop(context);
		setPlugin(null);
		resourceBundle = null;
	}

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

	private static void setPlugin(HelpPlugin plugin) {
		HelpPlugin.plugin = plugin;
	}

	/**
	 * Returns the string from the plugin's resource bundle,
	 * or 'key' if not found.
	 */
	public static String getResourceString(String key) {
		ResourceBundle bundle = HelpPlugin.getDefault().getResourceBundle();
		try {
			return (bundle != null) ? bundle.getString(key) : key;
		} catch (MissingResourceException e) {
			return key;
		}
	}

	/**
	 * Returns the plugin's resource bundle,
	 */
	public ResourceBundle getResourceBundle() {
		try {
			if (resourceBundle == null)
				resourceBundle = ResourceBundle.getBundle("org.hibernate.eclipse.help.HelpPluginResources"); //$NON-NLS-1$
		} catch (MissingResourceException x) {
			resourceBundle = null;
		}
		return resourceBundle;
	}
}
