/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.s60tools.traceanalyser.plugin;

import java.io.File;

import java.io.IOException;

import java.net.URL;

import org.eclipse.core.runtime.FileLocator;

import org.eclipse.core.runtime.jobs.ILock;

import org.eclipse.core.runtime.jobs.Job;

import org.eclipse.jface.resource.ImageDescriptor;

import org.eclipse.ui.plugin.AbstractUIPlugin;

import org.osgi.framework.BundleContext;

import com.nokia.s60tools.traceanalyser.model.Engine;

import com.nokia.s60tools.traceanalyser.resources.ImageResourceManager;

import com.nokia.s60tools.traceanalyser.ui.views.MainView;

/**

 * The activator class controls the plug-in life cycle

 */

public class TraceAnalyserPlugin extends AbstractUIPlugin {

	/* Access lock */

	private static ILock accessLock = null;

	/* Install path of Plugin */

	private String pluginInstallPath = "";

	/* Main view of Trace Analyser */

	private static MainView mainView;

	/* Engine of Trace Analyser */

	private static Engine engine;

	// The plug-in ID

	public static final String PLUGIN_ID = "com.nokia.s60tools.traceanalyser";

	// The shared instance

	private static TraceAnalyserPlugin plugin;

	/**

	 * TraceAnalyserPlugin.

	 * The constructor

	 */

	public TraceAnalyserPlugin() {

	}

	/*

	 * (non-Javadoc)

	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)

	 */

	public void start(BundleContext context) throws Exception {

		super.start(context);

		plugin = this;

		String pluginInstallLocation = getPluginInstallPath();

		String imagesPath = getImagesPath(pluginInstallLocation);

		// Loading images required by this plug-in

		ImageResourceManager.loadImages(imagesPath);

		accessLock = Job.getJobManager().newLock();

	}

	/*

	 * (non-Javadoc)

	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)

	 */

	public void stop(BundleContext context) throws Exception {

		engine.stop();

		plugin = null;

		super.stop(context);

	}

	/**

	 * getDefault.

	 * Returns the shared instance

	 * @return the shared instance

	 */

	public static TraceAnalyserPlugin getDefault() {

		return plugin;

	}

	/**

	 * getImageDescriptor.

	 * Returns an image descriptor for the image file at the given

	 * plug-in relative path

	 *

	 * @param path the path

	 * @return the image descriptor

	 */

	public static ImageDescriptor getImageDescriptor(String path) {

		return imageDescriptorFromPlugin(PLUGIN_ID, path);

	}

	/**

	 * getPluginInstallPath

	 * @return the path where this plugin is installed

	 */

	public static String getPluginInstallPath() {

		try {

			if ( plugin.pluginInstallPath.equals("") ) { //$NON-NLS-1$

				 // URL to the plugin's root ("/")

				URL relativeURL = plugin.getBundle().getEntry("/"); //$NON-NLS-1$

				//	Converting into local path

				URL localURL = FileLocator.toFileURL(relativeURL);

				//	Getting install location in correct form

				File f = new File(localURL.getPath());

				plugin.pluginInstallPath = f.getAbsolutePath();

			}

			return plugin.pluginInstallPath;

		} catch (Exception e) {

			return ""; //$NON-NLS-1$

		}

	}

	/**

	 * getImagesPath.

	 * Gets images path relative to given plugin install path.

	 * @param pluginInstallPath Plugin installation path.

	 * @return Path were image resources are located.

	 * @throws IOException

	 */

	private String getImagesPath(String pluginInstallPath) throws IOException{

		return pluginInstallPath

				+ File.separatorChar + "icons"; //$NON-NLS-1$

	}

	/**

	 * startEngine.

	 * Starts Trace Analyser's engine.

	 */

	public static void startEngine(){

		accessLock.acquire();

		if(engine == null){

			engine = new Engine();

		}

		accessLock.release();

	}

	/**

	 * getEngine

	 * getter for engine. If engine is not yet started this method starts it.

	 * @return

	 */

	public static Engine getEngine(){

		startEngine();

		return engine;

	}

	/**

	 * getMainView.

	 * @return main view of Trace Analyser

	 */

	public static MainView getMainView() {

		return mainView;

	}

	/**

	 * setMainView.

	 * @param newMainView new main view.

	 */

	public static void setMainView(MainView newMainView) {

		mainView = newMainView;

		if(engine != null){

			engine.setMainView(mainView);

		}

	}

	/**

	 * resets engine

	 */

	public static Engine restartEngine(){

		engine = new Engine();

		return engine;

	}

}