/*******************************************************************************
 * Copyright (c) 2004, 2005 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.ui.internal.handlers;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IWorkbenchWindow;

/**
 * A handler that can be used to imitate a IWorkbenchWindowActionDelegate.
 * 
 * @since 3.1
 */
public abstract class WorkbenchWindowHandlerDelegate extends
        ExecutableExtensionHandler implements IWorkbenchWindowHandlerDelegate {

    /**
     * By default, this will do nothing. Subclasses may override.
     * 
     * @param window
     *            the window that provides the context for this delegate
     * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#init(IWorkbenchWindow)
     */
    public void init(final IWorkbenchWindow window) {
        // Do nothing by default.
    }

    /**
     * This simply calls execute with a <code>null</code> map of parameter
     * values. If an <code>ExecutionException</code> occurs, then this should
     * be handle somehow. It's not clear what we'll do yet.
     * 
     * @param action
     *            The action proxy that handles the presentation portion of the
     *            action
     * @see org.eclipse.ui.IActionDelegate#run(IAction)
     */
    public void run(final IAction action) {
        try {
            execute(null);
        } catch (final ExecutionException e) {
            // TODO Do something meaningful and poignant.
        }

    }

    /**
     * By default, this will do nothing. Subclasses may override.
     * 
     * @param action
     *            The action proxy that handles presentation portion of the
     *            action
     * @param selection
     *            The current selection, or <code>null</code> if there is no
     *            selection.
     * 
     * @see org.eclipse.ui.IActionDelegate#selectionChanged(IAction, ISelection)
     */
    public void selectionChanged(IAction action, ISelection selection) {
        // Do nothing be default.
    }
}
