content: /*******************************************************************************
   * Copyright (c) 2000, 2007 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.actions;
  
  import org.eclipse.core.resources.IResource;
  import org.eclipse.core.runtime.IAdaptable;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.ui.views.tasklist.TaskPropertiesDialog;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.ui.actions.SelectionDispatchAction;
  
  public class AddTaskAction extends SelectionDispatchAction {
  
  	public AddTaskAction(IWorkbenchSite site) {
  		super(site);
  		setEnabled(false);
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.ADD_TASK_ACTION);
  	}
  
  	public void selectionChanged(IStructuredSelection selection) {
  		setEnabled(getElement(selection) != null);
  	}
  
  	public void run(IStructuredSelection selection) {
  		IResource resource= getElement(selection);
  		if (resource == null)
  			return;
  
  		TaskPropertiesDialog dialog= new TaskPropertiesDialog(getShell());
  		dialog.setResource(resource);
  		dialog.open();
  	}
  	
  	private IResource getElement(IStructuredSelection selection) {
  		if (selection.size() != 1)
  			return null;
  
  		Object element= selection.getFirstElement();
  		if (!(element instanceof IAdaptable))
  			return null;
  		return (IResource)((IAdaptable)element).getAdapter(IResource.class);
  	}	
  }
  