/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.actions;


import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.widgets.Event;
import org.eclipse.ui.IActionDelegate2;

/**
 * Abstract base implementation of <code>IActionDelegate</code> and
 * <code>IActionDelegate2</code> for a client delegate action.
 * <p>
 * Subclasses should reimplement <code>runWithEvent</code> or <code>run</code>
 * methods to do the action's work, and may reimplement
 * <code>selectionChanged</code> to react to selection changes in the workbench.
 * </p>
 */
public abstract class ActionDelegate implements IActionDelegate2 {
	/**
	 * The <code>ActionDelegate</code> implementation of this
	 * <code>IActionDelegate</code> method does nothing. Subclasses may
	 * reimplement.
	 * <p>
	 * <b>Note:</b> This method is not called directly by the proxy action. Only
	 * by the default implementation of <code>runWithEvent</code> of this
	 * abstract class.
	 */
	public void run(IAction action) {
	}
	
	/**
	 * The <code>ActionDelegate</code> implementation of this
	 * <code>IActionDelegate</code> method does nothing. Subclasses may
	 * reimplement.
	 */
	public void selectionChanged(IAction action, ISelection selection) {
	}

	/**
	 * The <code>ActionDelegate</code> implementation of this
	 * <code>IActionDelegate2</code> method does nothing. Subclasses may
	 * reimplement.
	 */
	public void init(IAction action) {
	}

	/**
	 * The <code>ActionDelegate</code> implementation of this
	 * <code>IActionDelegate2</code> method does nothing. Subclasses may
	 * reimplement.
	 */
	public void dispose() {
	}

	/**
	 * The <code>ActionDelegate</code> implementation of this
	 * <code>IActionDelegate2</code> method redirects to the <code>run</code>
	 * method. Subclasses may reimplement.
	 */
	public void runWithEvent(IAction action, Event event) {
		run(action);
	}
}
