/**
 * Copyright 2004-2016 Riccardo Solmi. All rights reserved.
 * This file is part of the Whole Platform.
 *
 * The Whole Platform 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 3 of the License, or
 * (at your option) any later version.
 *
 * The Whole Platform 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 the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
 */
package org.whole.lang;

import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Plugin;
import org.eclipse.core.runtime.Status;
import org.osgi.framework.BundleContext;

/**
 * @author Riccardo Solmi
 */
public class WholePlugin extends Plugin {
	public static final String PLUGIN_ID = "org.whole.lang";
	private static final int INTERNAL_ERROR = 120;
	private static WholePlugin plugin;

	public WholePlugin() {
		super();
		plugin = this;
	}

	public static WholePlugin getDefault() {
		return plugin;
	}

	/**
	 * Logs the specified status with this plug-in's log.
	 * 
	 * @param status status to log
	 */
	public static void log(IStatus status) {
		getDefault().getLog().log(status);
	}

	/**
	 * Logs the specified throwable with this plug-in's log.
	 * 
	 * @param t throwable to log 
	 */
	public static void log(Throwable t) {
		log(newErrorStatus("Error logged from Whole plug-in: ", t)); //$NON-NLS-1$
	}

	
	/**
	 * Returns a new error status for this plugin with the given message
	 * @param message the message to be included in the status
	 * @param exception the exception to be included in the status or <code>null</code> if none
	 * @return a new error status
	 */
	public static IStatus newErrorStatus(String message, Throwable exception) {
		return new Status(IStatus.ERROR, getUniqueIdentifier(), INTERNAL_ERROR, message, exception);
	}
	
	/**
	 * Convenience method which returns the unique identifier of this plugin.
	 */
	public static String getUniqueIdentifier() {
		if (getDefault() == null) {
			return PLUGIN_ID;
		}
		return getDefault().getBundle().getSymbolicName();
	}

	@Override
	public void start(BundleContext context) throws Exception {
		super.start(context);
		Platform.getExtensionRegistry().addRegistryChangeListener(DeployerExtensions.instance());
	}

	@Override
	public void stop(BundleContext context) throws Exception {
		IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry();
		if (extensionRegistry != null)
			extensionRegistry.removeRegistryChangeListener(DeployerExtensions.instance());
		super.stop(context);
	}
}