/*
 * Copyright (c) 2008-2010 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:  Definitions for the class ActivateTrace
 *
 */

package com.nokia.s60tools.analyzetool;

import org.eclipse.ui.IStartup;
import org.eclipse.core.runtime.*;
import com.nokia.s60tools.analyzetool.ui.IActionListener;
import com.nokia.s60tools.analyzetool.ui.MainView;

/**
 * Checks at plugin startup is trace plugin available and sets MainView trace
 * actions state
 * 
 * @author kihe
 * 
 */
public class ActivateTrace implements IStartup {

	/**
	 * Check is AnalyzeTool trace plug-in registered.
	 * 
	 * If not registered disables AnalyzeTool trace buttons.
	 * 
	 * @see org.eclipse.ui.IStartup#earlyStartup()
	 */
	public final void earlyStartup() {

		// get action listener
		final IActionListener listener = Activator.getActionListener();

		// get extension registry
		IExtensionRegistry registry = RegistryFactory.getRegistry();
		if (registry == null) {
			MainView.enableTrace = false;
			if (listener != null) {
				listener.disableTraceActions(false);
			}
			return;
		}

		// get analyzetool extension
		final IExtensionPoint extensionPoint = registry
				.getExtensionPoint("com.nokia.s60tools.analyzetool.AnalyzeTool");

		// try find analyzetool trace extension
		IExtension extension = null;
		if (extensionPoint != null) {
			extension = extensionPoint
					.getExtension("com.nokia.s60tools.analyzetool.trace.ActivateTrace");
		}

		// if trace extension found => enable trace buttons in the MainView
		if (extension != null && extension.isValid()) {
			MainView.enableTrace = true;
			if (listener != null) {
				listener.disableTraceActions(true);
			}
		}
		// no trace extension found => disable trace buttons
		else {
			MainView.enableTrace = false;
			if (listener != null) {
				listener.disableTraceActions(false);
			}
		}
	}
}