/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.

 */

package com.oracle.solaris.vp.panel.common.control;

/**

 * The {@code UITransitionManager} class manages all {@link NavigationListener}s

 * that handle the UI transitions that occur as a result of navigation.

 * Presumably only one such {@link NavigationListener} should handle any given

 * transition -- this class allows the instigators of the navigation to specify

 * which.

 */

public class UITransitionManager implements NavigationListener {

    //

    // Instance data

    //

    private NavigationListener handler;

    //

    // Constructors

    //

    public UITransitionManager() {

    }

    public UITransitionManager(NavigationListener handler) {

	setHandler(handler);

    }

    //

    // NavigationListener methods

    //

    /**

     * Delegates the event to the handler, if non-{@code null}.

     */

    @Override

    public void navigationStarted(NavigationStartEvent event) {

	if (handler != null) {

	    handler.navigationStarted(event);

	}

    }

    /**

     * Delegates the event to the handler, if non-{@code null}.

     */

    @Override

    public void navigationStopped(NavigationStopEvent event) {

	if (handler != null) {

	    handler.navigationStopped(event);

	}

    }

    //

    // UITransitionManager methods

    //

    public NavigationListener getHandler() {

	return handler;

    }

    public void setHandler(NavigationListener handler) {

	this.handler = handler;

    }

}