layers/org.eclipse.papyrus.layers.ui/src/org/eclipse/papyrus/layers3/ui/handlers/OpenLayerExplorerHandler.java

/*******************************************************************************
 * Copyright (c) 2013 CEA LIST.
 * 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:
 *     Cedric Dumoulin - cedric.dumoulin@lifl.fr
 ******************************************************************************/
/**
 *
 */
package org.eclipse.papyrus.layers3.ui.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.papyrus.layers.stackmodel.NotFoundException;
import org.eclipse.papyrus.layers3.ui.view.LayersExplorerViewUtils;

/**
 * Open Layer Explorer ui handler.
 *
 * @author cedric dumoulin
 *
 */
public class OpenLayerExplorerHandler extends AbstractHandler {

	/**
	 *
	 */
	@Override
	public Object execute(ExecutionEvent event) throws ExecutionException {

		LayersExplorerViewUtils.openView(event);

		return null;
	}


	@Override
	public void setEnabled(Object evaluationContext) {

		//
		if (evaluationContext == null) {
			setBaseEnabled(false);
			return;

		}

		LayersExplorerViewUtils.isViewOpened((IEvaluationContext) evaluationContext);
		setBaseEnabled(true);
		super.setEnabled(evaluationContext);
	}

	/**
	 *
	 * @param event
	 * @return
	 * @throws NotFoundException
	 */
	protected IEvaluationContext getIEvaluationContext(ExecutionEvent event) throws NotFoundException {
		try {
			return (IEvaluationContext) event.getApplicationContext();
		} catch (ClassCastException e) {
			throw new NotFoundException("IEvaluationContext can't be found.");
		}

	}


}