/*******************************************************************************
 * Copyright (c) 2005, 2006 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal.examples.navigator;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
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.ui.examples.navigator"; //$NON-NLS-1$
	  
	// The shared instance
	private static Activator plugin;  
	/**
	 * The constructor
	 */
	public Activator() {
		plugin = this;
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context); 
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	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;
	} 

	/**
	 * Record an error against this plugin's log. 
	 * 
	 * @param aCode
	 * @param aMessage
	 * @param anException
	 */
	public static void logError(int aCode, String aMessage,
			Throwable anException) {
		getDefault().getLog().log(
				createErrorStatus(aCode, aMessage, anException));
	}

	/**
	 * 
	 * Record a message against this plugin's log. 
	 * 
	 * @param severity
	 * @param aCode
	 * @param aMessage
	 * @param exception
	 */
	public static void log(int severity, int aCode, String aMessage,
			Throwable exception) {
		log(createStatus(severity, aCode, aMessage, exception));
	}

	/**
	 * 
	 * Record a status against this plugin's log. 
	 * 
	 * @param aStatus
	 */
	public static void log(IStatus aStatus) {
		getDefault().getLog().log(aStatus);
	}

	/**
	 * Create a status associated with this plugin.
	 *  
	 * @param severity
	 * @param aCode
	 * @param aMessage
	 * @param exception
	 * @return A status configured with this plugin's id and the given parameters.
	 */
	public static IStatus createStatus(int severity, int aCode,
			String aMessage, Throwable exception) {
		return new Status(severity, PLUGIN_ID, aCode,
				aMessage != null ? aMessage : "No message.", exception); //$NON-NLS-1$
	}

	/**
	 * 
	 * @param aCode
	 * @param aMessage
	 * @param exception
	 * @return A status configured with this plugin's id and the given parameters.
	 */
	public static IStatus createErrorStatus(int aCode, String aMessage,
			Throwable exception) {
		return createStatus(IStatus.ERROR, aCode, aMessage, exception);
	}
}