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.ErrorDialog;
  import org.eclipse.jface.text.ITextSelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IOpenable;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.internal.ui.actions.ActionMessages;
  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.packageview.PackageExplorerPart;
  /**
   * This action reveals the currently selected JavaScript element in the 
   * package explorer. 
   * <p>
   * The action is applicable to selections containing elements of type
   * <code>IJavaScriptElement</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 ShowInPackageViewAction extends SelectionDispatchAction {
  	
  	private JavaEditor fEditor;
  	
  	/**
  	 * Creates a new <code>ShowInPackageViewAction</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 ShowInPackageViewAction(IWorkbenchSite site) {
  		super(site);
  		setText(ActionMessages.ShowInPackageViewAction_label); 
  		setDescription(ActionMessages.ShowInPackageViewAction_description); 
  		setToolTipText(ActionMessages.ShowInPackageViewAction_tooltip); 
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.SHOW_IN_PACKAGEVIEW_ACTION);	
  	}
  	
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the JavaScript editor
  	 */
  	public ShowInPackageViewAction(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(checkEnabled(selection));
  	}
  	
  	private boolean checkEnabled(IStructuredSelection selection) {
  		if (selection.size() != 1)
  			return false;
  		return selection.getFirstElement() instanceof IJavaScriptElement;
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void run(ITextSelection selection) {
  		try {
  			IJavaScriptElement element= SelectionConverter.getElementAtOffset(fEditor);
  			if (element != null)
  				run(element);
  		} catch (JavaScriptModelException e) {
  			JavaScriptPlugin.log(e);
  			String message= ActionMessages.ShowInPackageViewAction_error_message; 
  			ErrorDialog.openError(getShell(), getDialogTitle(), message, e.getStatus());
  		}	
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void run(IStructuredSelection selection) {
  		if (!checkEnabled(selection))
  			return;
  		run((IJavaScriptElement)selection.getFirstElement());
  	}
  	
  	/*
  	 * No Javadoc. The method should be internal but can't be changed since
  	 * we shipped it with a public visibility 
  	 */
  	public void run(IJavaScriptElement element) {
  		if (element == null)
  			return;
  			
  		// reveal the top most element only
  		IOpenable openable= element.getOpenable();
  		if (openable instanceof IJavaScriptElement)
  			element= (IJavaScriptElement)openable;
  
  		PackageExplorerPart view= PackageExplorerPart.openInActivePerspective();
  		view.tryToReveal(element);
  	}
  
  	private static String getDialogTitle() {
  		return ActionMessages.ShowInPackageViewAction_dialog_title; 
  	}
  }
  