content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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
   ******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.commands;
  
  import org.eclipse.core.commands.AbstractHandler;
  import org.eclipse.core.commands.ExecutionEvent;
  import org.eclipse.core.commands.ExecutionException;
  import org.eclipse.ui.IWorkbenchWindow;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.internal.ui.util.OpenTypeHierarchyUtil;
  
  /**
   * A command handler to show a java element in the type hierarchy view.
   * 
   * 
   */
  public class ShowElementInTypeHierarchyViewHandler extends AbstractHandler {
  
  	private static final String PARAM_ID_ELEMENT_REF= "elementRef"; //$NON-NLS-1$
  
  	public Object execute(ExecutionEvent event) throws ExecutionException {
  
  		IWorkbenchWindow window= JavaScriptPlugin.getActiveWorkbenchWindow();
  		if (window == null)
  			return null;
  
  		IJavaScriptElement javaElement= (IJavaScriptElement) event.getObjectParameterForExecution(PARAM_ID_ELEMENT_REF);
  
  		OpenTypeHierarchyUtil.open(javaElement, window);
  
  		return null;
  	}
  }
  