// CorePlugin.java
package org.eclipse.stem.core;

/*******************************************************************************
 * Copyright (c) 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
 *******************************************************************************/

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Plugin;
import org.eclipse.core.runtime.Status;
import org.eclipse.stem.adapters.file.IdentifiableFileAdapterFactory;
import org.eclipse.stem.core.graph.provider.GraphTimeProviderAdapterFactory;
import org.osgi.framework.BundleContext;

/**
 * The core STEM plugin.
 */
public class CorePlugin extends Plugin {

	/**
	 * The plug-in ID
	 */
	public static final String PLUGIN_ID = "org.eclipse.stem.core";

	// The shared instance.
	private static CorePlugin plugin;

	/**
	 * The constructor.
	 */
	public CorePlugin() {
		plugin = this;
	} // CorePlugin

	/**
	 * This method is called upon plug-in activation
	 * 
	 * @param context
	 * @throws Exception
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);
		new GraphTimeProviderAdapterFactory();
		new IdentifiableFileAdapterFactory();
		// The constructor will populate the plug-in specified resources
		// stem = new STEM();
	} // start

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

	/**
	 * Returns the shared instance.
	 * 
	 * @return the singleton instance of the plug-in class.
	 */
	public static CorePlugin getDefault() {
		return plugin;
	} // CorePlugin

	/**
	 * Log an error to the ILog for this plugin
	 * 
	 * @param message
	 *            the localized error message text
	 * @param exception
	 *            the associated exception, or null
	 */
	public static void logError(String message, Throwable exception) {
		// Do we have a plugin?
		if (plugin != null) {
			// Yes
			plugin.getLog().log(
					new Status(IStatus.ERROR, plugin.getBundle().getSymbolicName(),
							0, message, exception));
		}
		else {
			// No
			System.out.println(message);
			// Exception?
			if (exception != null) {
				// Yes
				System.out.println(exception.getMessage());
			} // if 
		}
	} // logError

	/**
	 * Log information to the ILog for this plugin
	 * 
	 * @param message
	 *            the localized information message text
	 * @param exception
	 *            the associated exception, or null
	 */
	public static void logInformation(String message, Throwable exception) {
		// Do we have a plugin?
		if (plugin != null) {
			// Yes
			plugin.getLog().log(
					new Status(IStatus.INFO, plugin.getBundle().getSymbolicName(),
							0, message, exception));
		}
		else {
			// No
			System.out.println(message);
			// Exception?
			if (exception != null) {
				// Yes
				System.out.println(exception.getMessage());
			} // if 
		}
	} // logInformation
	
	
	/**
	 * Log information to the ILog for this plugin
	 * The method is overloaded to allow for logInformation without an error 
	 * method sets the error to null. This should be used instead of System.out.println
	 * throughout the code.
	 * @param message
	 *            the localized information message text
	 *
	 */
	public static void logInformation(String message) {
		// Do we have a plugin?
		if (plugin != null) {
			// Yes
			plugin.getLog().log(
					new Status(IStatus.INFO, plugin.getBundle().getSymbolicName(),
							0, message, null));
		}
		else {
			// No
			System.out.println(message);
		}
	} // logInformation

	
	
} // CorePlugin