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.ui.actions;
  
  import org.eclipse.jface.dialogs.MessageDialog;
  import org.eclipse.jface.text.ITextSelection;
  import org.eclipse.jface.viewers.ISelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.jface.viewers.SelectionChangedEvent;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.JavaEditor;
  import org.eclipse.wst.jsdt.internal.ui.refactoring.RefactoringMessages;
  import org.eclipse.wst.jsdt.internal.ui.refactoring.actions.RenameJavaElementAction;
  import org.eclipse.wst.jsdt.internal.ui.refactoring.actions.RenameResourceAction;
  
  /**
   * Renames a JavaScript element or workbench resource.
   * <p>
   * Action is applicable to selections containing elements of type
   * <code>IJavaScriptElement</code> or <code>IResource</code>.
   * 
   * <p>
   * This class may be instantiated; it is not intended to be subclassed.
   * </p>
   * 
   *
   * Provisional API: This class/interface is part of an interim API that is still under development and expected to
   * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
   * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
   * (repeatedly) as the API evolves.
   */
  public class RenameAction extends SelectionDispatchAction {
  
  	private RenameJavaElementAction fRenameJavaElement;
  	private RenameResourceAction fRenameResource;
  
  	/**
  	 * Creates a new <code>RenameAction</code>. The action requires
  	 * that the selection provided by the site's selection provider is of type <code>
  	 * org.eclipse.jface.viewers.IStructuredSelection</code>.
  	 * 
  	 * @param site the site providing context information for this action
  	 */
  	public RenameAction(IWorkbenchSite site) {
  		super(site);
  		setText(RefactoringMessages.RenameAction_text); 
  		fRenameJavaElement= new RenameJavaElementAction(site);
  		fRenameJavaElement.setText(getText());
  		fRenameResource= new RenameResourceAction(site);
  		fRenameResource.setText(getText());
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.RENAME_ACTION);
  	}
  	
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the JavaScript editor
  	 */
  	public RenameAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fRenameJavaElement= new RenameJavaElementAction(editor);
  	}
  	
  	/*
  	 * @see ISelectionChangedListener#selectionChanged(SelectionChangedEvent)
  	 */
  	public void selectionChanged(SelectionChangedEvent event) {
  		fRenameJavaElement.selectionChanged(event);
  		if (fRenameResource != null)
  			fRenameResource.selectionChanged(event);
  		setEnabled(computeEnabledState());		
  	}
  
  	/*
  	 * @see SelectionDispatchAction#update(ISelection)
  	 */
  	public void update(ISelection selection) {
  		fRenameJavaElement.update(selection);
  		
  		if (fRenameResource != null)
  			fRenameResource.update(selection);
  	
  		setEnabled(computeEnabledState());		
  	}
  	
  	private boolean computeEnabledState(){
  		if (fRenameResource != null) {
  			return fRenameJavaElement.isEnabled() || fRenameResource.isEnabled();
  		} else {
  			return fRenameJavaElement.isEnabled();
  		}
  	}
  	
  	public void run(IStructuredSelection selection) {
  		if (fRenameJavaElement.isEnabled())
  			fRenameJavaElement.run(selection);
  		if (fRenameResource != null && fRenameResource.isEnabled())
  			fRenameResource.run(selection);
  	}
  
  	public void run(ITextSelection selection) {
  		if (fRenameJavaElement.canRunInEditor())
  			fRenameJavaElement.run(selection);
  		else
  			MessageDialog.openInformation(getShell(), RefactoringMessages.RenameAction_rename, RefactoringMessages.RenameAction_unavailable);  
  	}
  }
  