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.text.ITextSelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.swt.widgets.Shell;
  import org.eclipse.ui.IEditorInput;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.ui.texteditor.IEditorStatusLine;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IMember;
  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.ActionUtil;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.IClassFileEditorInput;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.JavaEditor;
  import org.eclipse.wst.jsdt.internal.ui.search.ExceptionOccurrencesFinder;
  import org.eclipse.wst.jsdt.internal.ui.search.FindOccurrencesEngine;
  
  /**
   * Action to find all originators of a exception (e.g. method invocations, 
   * class casts, ...) for a given exception.
   * <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 FindExceptionOccurrencesAction extends SelectionDispatchAction {
  	
  	private JavaEditor fEditor;
  	
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * 
  	 * @param editor the JavaScript editor
  	 */
  	public FindExceptionOccurrencesAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setEnabled(getEditorInput(editor) != null);
  	}
  	
  	/**
  	 * Creates a new <code>FindExceptionOccurrencesAction</code>. The action 
  	 * requires that the selection provided by the site's selection provider is of type 
  	 * <code>IStructuredSelection</code>.
  	 * 
  	 * @param site the site providing context information for this action
  	 */
  	public FindExceptionOccurrencesAction(IWorkbenchSite site) {
  		super(site);
  		setText(ActionMessages.FindExceptionOccurrences_text); 
  		setToolTipText(ActionMessages.FindExceptionOccurrences_toolTip); 
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.FIND_EXCEPTION_OCCURRENCES);
  	}
  	
  	//---- Text Selection ----------------------------------------------------------------------
  	
  	/**
  	 * {@inheritDoc}
  	 */
  	public void selectionChanged(ITextSelection selection) {
  	}
  	
  	/**
  	 * {@inheritDoc}
  	 * 
  	 * 
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		setEnabled(getMember(selection) != null);
  	}
  
  	/* (non-JavaDoc)
  	 * Method declared in SelectionDispatchAction.
  	 */
  	public final void run(ITextSelection ts) {
  		IJavaScriptElement input= getEditorInput(fEditor);
  		if (!ActionUtil.isProcessable(getShell(), input))
  			return;
  		FindOccurrencesEngine engine= FindOccurrencesEngine.create(input, new ExceptionOccurrencesFinder());
  		try {
  			String result= engine.run(ts.getOffset(), ts.getLength());
  			if (result != null)
  				showMessage(getShell(), fEditor, result);
  		} catch (JavaScriptModelException e) {
  			JavaScriptPlugin.log(e);
  		}
  	}
  
  	private static IJavaScriptElement getEditorInput(JavaEditor editor) {
  		IEditorInput input= editor.getEditorInput();
  		if (input instanceof IClassFileEditorInput)
  			return ((IClassFileEditorInput)input).getClassFile();
  		return  JavaScriptPlugin.getDefault().getWorkingCopyManager().getWorkingCopy(input);
  	} 
  		
  	private static void showMessage(Shell shell, JavaEditor editor, String msg) {
  		IEditorStatusLine statusLine= (IEditorStatusLine) editor.getAdapter(IEditorStatusLine.class);
  		if (statusLine != null) 
  			statusLine.setMessage(true, msg, null); 
  		shell.getDisplay().beep();
  	}
  	
  	private IMember getMember(IStructuredSelection selection) {
  		return null;
  	}
  }
  