package org.eclipse.stem.diseasemodels;

/*******************************************************************************
 * 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.core.Constants;
import org.eclipse.stem.diseasemodels.standard.provider.StandardHistoryProviderAdapterFactory;
import org.eclipse.stem.diseasemodels.standard.provider.StandardRelativeValueHistoryProviderAdapterFactory;
import org.eclipse.stem.diseasemodels.standard.provider.StandardRelativeValueProviderAdapterFactory;
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 = Constants.ID_ROOT + ".diseasemodels";

	// The shared instance
	private static Activator plugin;

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

	/**
	 * @param context
	 * @throws Exception
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);
		// We create these instances so that their constructors run and they
		// then add themselves to a collection of factories maintained by the
		// factory interfaces they implement respectively.
		
		// Add to RelativeValueProviderAdapterFactory.INSTANCE
		new StandardRelativeValueProviderAdapterFactory();
		
		// Add to RelativeValueHistoryProviderAdapterFactory.INSTANCE
		new StandardRelativeValueHistoryProviderAdapterFactory();
		
		// Add to HistoryProviderAdapterFactory.INSTANCE
		new StandardHistoryProviderAdapterFactory();
	} // start

	/**
	 * @see org.eclipse.core.runtime.Plugin#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;
	}

	/**
	 * 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) {
		// Running as a plugin?
		if (plugin != null) {
			// Yes
			plugin.getLog().log(
					new Status(IStatus.ERROR, plugin.getBundle()
							.getSymbolicName(), 0, message, exception));
		} else {
			System.err.println(message);
			// Exception?
			if (exception != null) {
				// Yes
				System.err.println(exception.getMessage());
				exception.printStackTrace(System.err);
			}
		}

	} // 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
	
} // Activator