org.eclipse.mylyn.reviews.r4e.ui/src/org/eclipse/mylyn/reviews/r4e/ui/internal/commands/handlers/ChangeDisplayHandler.java

/*******************************************************************************
 * Copyright (c) 2011, 2012 Ericsson AB 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
 * 
 * Description:
 * 
 * This class implements the navigator view toolbar command to collapse all elements
 * of the review tree
 * 
 * Contributors:
 *   Sebastien Dubois - Created for Mylyn Review R4E project
 *   
 ******************************************************************************/

package org.eclipse.mylyn.reviews.r4e.ui.internal.commands.handlers;

import java.util.Map;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.Command;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.mylyn.reviews.r4e.ui.R4EUIPlugin;
import org.eclipse.mylyn.reviews.r4e.ui.internal.model.R4EUIModelController;
import org.eclipse.mylyn.reviews.r4e.ui.internal.navigator.ReviewNavigatorTreeViewer;
import org.eclipse.mylyn.reviews.r4e.ui.internal.utils.R4EUIConstants;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.commands.ICommandService;
import org.eclipse.ui.commands.IElementUpdater;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.menus.UIElement;
import org.eclipse.ui.services.IEvaluationService;

/**
 * @author Sebastien Dubois
 * @version $Revision: 1.0 $
 */
public class ChangeDisplayHandler extends AbstractHandler implements IElementUpdater {

	// ------------------------------------------------------------------------
	// Constants
	// ------------------------------------------------------------------------

	/**
	 * Field COMMAND_MESSAGE. (value is ""Changing Display..."")
	 */
	private static final String COMMAND_MESSAGE = "Changing Display...";

	// ------------------------------------------------------------------------
	// Methods
	// ------------------------------------------------------------------------

	/**
	 * Method execute.
	 * 
	 * @param aEvent
	 *            ExecutionEvent
	 * @return Object
	 * @see org.eclipse.core.commands.IHandler#execute(ExecutionEvent)
	 */
	public Object execute(final ExecutionEvent aEvent) {

		if (null != R4EUIModelController.getActiveReview()) {

			//Change Display Type (Global Tree / Review TreeTable)
			R4EUIPlugin.Ftracer.traceInfo("Changing Display Type"); //$NON-NLS-1$
			final Command command = aEvent.getCommand();
			try {
				HandlerUtil.toggleCommandState(command);
				if (R4EUIModelController.getNavigatorView().isDefaultDisplay()) {
					((ReviewNavigatorTreeViewer) R4EUIModelController.getNavigatorView().getTreeViewer()).setViewTreeTable();
				} else {
					((ReviewNavigatorTreeViewer) R4EUIModelController.getNavigatorView().getTreeViewer()).setViewTree();
				}

				final IEvaluationService evService = (IEvaluationService) HandlerUtil.getActiveWorkbenchWindowChecked(
						aEvent).getService(IEvaluationService.class);
				evService.requestEvaluation(R4EUIConstants.DEFAULT_DISPLAY_COMMAND);
				evService.requestEvaluation(R4EUIConstants.CHANGE_DISPLAY_COMMAND);
				evService.requestEvaluation(R4EUIConstants.PREVIOUS_STATE_ELEMENT_COMMAND);
				evService.requestEvaluation(R4EUIConstants.NEXT_STATE_ELEMENT_COMMAND);
				evService.requestEvaluation(R4EUIConstants.ALPHA_SORTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.REVIEW_TYPE_SORTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.REVIEWS_ONLY_FILTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.REVIEWS_MY_FILTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.REVIEWS_PARTICIPANT_FILTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.ANOMALIES_FILTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.ANOMALIES_MY_FILTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.REVIEWS_COMPLETED_FILTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.HIDE_RULE_SETS_FILTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.HIDE_DELTAS_FILTER_COMMAND);
				evService.requestEvaluation(R4EUIConstants.REMOVE_ALL_FILTER_COMMAND);
			} catch (ExecutionException e) {
				R4EUIPlugin.Ftracer.traceError("Exception: " + e.toString() + " (" + e.getMessage() + ")"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
			}
		}
		return null;
	}

	/**
	 * Method updateElement.
	 * 
	 * @param element
	 *            UIElement
	 * @param parameters
	 *            Map
	 * @see org.eclipse.ui.commands.IElementUpdater#updateElement(UIElement, Map)
	 */
	public void updateElement(UIElement element, Map parameters) {
		ICommandService commandService = (ICommandService) PlatformUI.getWorkbench().getService(ICommandService.class);
		Command command = commandService.getCommand("org.eclipse.mylyn.reviews.r4e.ui.commands.changeDisplay");
		element.setChecked((Boolean) command.getState(R4EUIConstants.TOGGLE_STATE_COMMAND_KEY).getValue());
	}
}