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 java.lang.reflect.InvocationTargetException;
  
  import org.eclipse.core.resources.IResource;
  import org.eclipse.jface.text.ITextSelection;
  import org.eclipse.jface.viewers.ISelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.jface.viewers.StructuredSelection;
  import org.eclipse.ui.IPageLayout;
  import org.eclipse.ui.IViewPart;
  import org.eclipse.ui.IWorkbenchPage;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PartInitException;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.ui.part.ISetSelectionTarget;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.actions.ActionMessages;
  import org.eclipse.wst.jsdt.internal.ui.actions.ActionUtil;
  import org.eclipse.wst.jsdt.internal.ui.actions.SelectionConverter;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.JavaEditor;
  import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler;
  
  /**
   * Reveals the selected element in the resource navigator view. 
   * <p>
   * Action is applicable to structured selections containing JavaScript element 
   * or resources.
   * 
   * <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 ShowInNavigatorViewAction extends SelectionDispatchAction {
  
  	private JavaEditor fEditor;
  	
  	/**
  	 * Creates a new <code>ShowInNavigatorViewAction</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 ShowInNavigatorViewAction(IWorkbenchSite site) {
  		super(site);
  		setText(ActionMessages.ShowInNavigatorView_label); 
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.SHOW_IN_NAVIGATOR_VIEW_ACTION);
  	}
  
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the JavaScript editor
  	 */
  	public ShowInNavigatorViewAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setEnabled(SelectionConverter.canOperateOn(fEditor));
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void selectionChanged(ITextSelection selection) {
  	}
  
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		setEnabled(getResource(selection) != null); 
  	}
  
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void run(ITextSelection selection) {
  		IJavaScriptElement input= SelectionConverter.getInput(fEditor);
  		if (!ActionUtil.isProcessable(getShell(), input))
  			return;		
  		
  		
  		try {
  			IJavaScriptElement[] elements= SelectionConverter.codeResolveOrInputForked(fEditor);
  			if (elements == null || elements.length == 0)
  				return;
  			
  			IJavaScriptElement candidate= elements[0];
  			if (elements.length > 1) {
  				candidate= SelectionConverter.selectJavaElement(elements, getShell(), getDialogTitle(), ActionMessages.ShowInNavigatorView_dialog_message);
  			}
  			if (candidate != null) {
  				run(getResource(candidate));
  			}
  		} catch (InvocationTargetException e) {
  			ExceptionHandler.handle(e, getDialogTitle(), ActionMessages.SelectionConverter_codeResolve_failed);
  		} catch (InterruptedException e) {
  			// cancelled
  		}
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void run(IStructuredSelection selection) {
  		run(getResource(selection));
  	}
  	
  	/*
  	 * No Javadoc. The method should be internal but can't be changed since
  	 * we shipped it with a public visibility 
  	 */
  	public void run(IResource resource) {
  		if (resource == null)
  			return;
  		try {
  			IWorkbenchPage page= getSite().getWorkbenchWindow().getActivePage();	
  			IViewPart view= page.showView(IPageLayout.ID_RES_NAV);
  			if (view instanceof ISetSelectionTarget) {
  				ISelection selection= new StructuredSelection(resource);
  				((ISetSelectionTarget)view).selectReveal(selection);
  			}
  		} catch(PartInitException e) {
  			ExceptionHandler.handle(e, getShell(), getDialogTitle(), ActionMessages.ShowInNavigatorView_error_activation_failed); 
  		}
  	}
  	
  	private IResource getResource(IStructuredSelection selection) {
  		if (selection.size() != 1)
  			return null;
  		Object element= selection.getFirstElement();
  		if (element instanceof IResource)
  			return (IResource)element;
  		if (element instanceof IJavaScriptElement)
  			return getResource((IJavaScriptElement)element);
  		return null;
  	}
  	
  	private IResource getResource(IJavaScriptElement element) {
  		if (element == null)
  			return null;
  		
  		element= (IJavaScriptElement) element.getOpenable();
  		if (element instanceof IJavaScriptUnit) {
  			element= ((IJavaScriptUnit) element).getPrimary();
  		}
  		return element.getResource();
  	}
  	
  	private static String getDialogTitle() {
  		return ActionMessages.ShowInNavigatorView_dialog_title; 
  	}	
  }
  