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comparison src/org/tmatesoft/hg/internal/LifecycleProxy.java @ 520:1ee452f31187

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Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 21 Dec 2012 21:20:26 +0100
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519:934037edbea0 520:1ee452f31187
1 /*
2 * Copyright (c) 2012 TMate Software Ltd
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * For information on how to redistribute this software under
14 * the terms of a license other than GNU General Public License
15 * contact TMate Software at support@hg4j.com
16 */
17 package org.tmatesoft.hg.internal;
18
19 import org.tmatesoft.hg.util.Adaptable;
20
21 /**
22 * Save callback and delegate to another lifecycle instance, if any
23 *
24 * @author Artem Tikhomirov
25 * @author TMate Software Ltd.
26 */
27 public class LifecycleProxy implements Lifecycle {
28
29 private Callback lifecycleCallback;
30 private Lifecycle target;
31
32 public LifecycleProxy() {
33 }
34
35 public LifecycleProxy(Object delegate) {
36 init(delegate);
37 }
38
39
40 public void start(int count, Callback callback, Object token) {
41 lifecycleCallback = callback;
42 if (target != null) {
43 target.start(count, callback, token);
44 }
45 }
46
47 public void finish(Object token) {
48 if (target != null) {
49 target.finish(token);
50 }
51 lifecycleCallback = null;
52 }
53
54 public void init(Object delegate) {
55 target = Adaptable.Factory.getAdapter(delegate, Lifecycle.class, null);
56 }
57
58 public void stop() {
59 assert lifecycleCallback != null;
60 if (lifecycleCallback != null) {
61 lifecycleCallback.stop();
62 }
63 }
64 }