package org.cookbook.ch12.MenuPlugIn.actions;import org.eclipse.jface.action.IAction;import org.eclipse.jface.viewers.ISelection;import org.eclipse.ui.IWorkbenchWindow;import org.eclipse.ui.IWorkbenchWindowActionDelegate;import org.eclipse.jface.dialogs.MessageDialog;/** * Our sample action implements workbench action delegate. * The action proxy will be created by the workbench and * shown in the UI. When the user tries to use the action, * this delegate will be created and execution will be  * delegated to it. * @see IWorkbenchWindowActionDelegate */public class SampleAction implements IWorkbenchWindowActionDelegate {	private IWorkbenchWindow window;	/**	 * The constructor.	 */	public SampleAction() {	}	/**	 * The action has been activated. The argument of the	 * method represents the 'real' action sitting	 * in the workbench UI.	 * @see IWorkbenchWindowActionDelegate#run	 */	public void run(IAction action) {		MessageDialog.openInformation(			window.getShell(),			"MenuPlugIn Plug-in",			"This plug-in is functional.");	}	/**	 * Selection in the workbench has been changed. We 	 * can change the state of the 'real' action here	 * if we want, but this can only happen after 	 * the delegate has been created.	 * @see IWorkbenchWindowActionDelegate#selectionChanged	 */	public void selectionChanged(IAction action, ISelection selection) {	}	/**	 * We can use this method to dispose of any system	 * resources we previously allocated.	 * @see IWorkbenchWindowActionDelegate#dispose	 */	public void dispose() {	}	/**	 * We will cache window object in order to	 * be able to provide parent shell for the message dialog.	 * @see IWorkbenchWindowActionDelegate#init	 */	public void init(IWorkbenchWindow window) {		this.window = window;	}}