tikhomirov@520: /*
tikhomirov@520:  * Copyright (c) 2012 TMate Software Ltd
tikhomirov@520:  *  
tikhomirov@520:  * This program is free software; you can redistribute it and/or modify
tikhomirov@520:  * it under the terms of the GNU General Public License as published by
tikhomirov@520:  * the Free Software Foundation; version 2 of the License.
tikhomirov@520:  *
tikhomirov@520:  * This program is distributed in the hope that it will be useful,
tikhomirov@520:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@520:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@520:  * GNU General Public License for more details.
tikhomirov@520:  *
tikhomirov@520:  * For information on how to redistribute this software under
tikhomirov@520:  * the terms of a license other than GNU General Public License
tikhomirov@520:  * contact TMate Software at support@hg4j.com
tikhomirov@520:  */
tikhomirov@520: package org.tmatesoft.hg.internal;
tikhomirov@520: 
tikhomirov@520: import org.tmatesoft.hg.util.Adaptable;
tikhomirov@520: 
tikhomirov@520: /**
tikhomirov@520:  * Save callback and delegate to another lifecycle instance, if any
tikhomirov@520:  * 
tikhomirov@520:  * @author Artem Tikhomirov
tikhomirov@520:  * @author TMate Software Ltd.
tikhomirov@520:  */
tikhomirov@520: public class LifecycleProxy implements Lifecycle {
tikhomirov@520: 	
tikhomirov@520: 	private Callback lifecycleCallback;
tikhomirov@520: 	private Lifecycle target;
tikhomirov@520: 	
tikhomirov@520: 	public LifecycleProxy() {
tikhomirov@520: 	}
tikhomirov@520: 
tikhomirov@520: 	public LifecycleProxy(Object delegate) {
tikhomirov@520: 		init(delegate);
tikhomirov@520: 	}
tikhomirov@520: 	
tikhomirov@520: 
tikhomirov@520: 	public void start(int count, Callback callback, Object token) {
tikhomirov@520: 		lifecycleCallback = callback;
tikhomirov@520: 		if (target != null) {
tikhomirov@520: 			target.start(count, callback, token);
tikhomirov@520: 		}
tikhomirov@520: 	}
tikhomirov@520: 
tikhomirov@520: 	public void finish(Object token) {
tikhomirov@520: 		if (target != null) {
tikhomirov@520: 			target.finish(token);
tikhomirov@520: 		}
tikhomirov@520: 		lifecycleCallback = null;
tikhomirov@520: 	}
tikhomirov@520: 
tikhomirov@520: 	public void init(Object delegate) {
tikhomirov@520: 		target = Adaptable.Factory.getAdapter(delegate, Lifecycle.class, null);
tikhomirov@520: 	}
tikhomirov@520: 
tikhomirov@520: 	public void stop() {
tikhomirov@520: 		assert lifecycleCallback != null;
tikhomirov@520: 		if (lifecycleCallback != null) {
tikhomirov@520: 			lifecycleCallback.stop();
tikhomirov@520: 		}
tikhomirov@520: 	}
tikhomirov@520: }