1 /*
2 * Copyright (C) 2012, Google Inc.
3 * and other copyright owners as documented in the project's IP log.
4 *
5 * This program and the accompanying materials are made available
6 * under the terms of the Eclipse Distribution License v1.0 which
7 * accompanies this distribution, is reproduced below, and is
8 * available at http://www.eclipse.org/org/documents/edl-v10.php
9 *
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * - Neither the name of the Eclipse Foundation, Inc. nor the
25 * names of its contributors may be used to endorse or promote
26 * products derived from this software without specific prior
27 * written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43
44 package org.eclipse.jgit.transport;
45
46 import java.util.List;
47
48 /**
49 * {@link org.eclipse.jgit.transport.AdvertiseRefsHook} that delegates to a list
50 * of other hooks.
51 * <p>
52 * Hooks are run in the order passed to the constructor. A hook may inspect or
53 * modify the results of the previous hooks in the chain by calling
54 * {@link org.eclipse.jgit.transport.UploadPack#getAdvertisedRefs()}, or
55 * {@link org.eclipse.jgit.transport.BaseReceivePack#getAdvertisedRefs()} or
56 * {@link org.eclipse.jgit.transport.BaseReceivePack#getAdvertisedObjects()}.
57 */
58 public class AdvertiseRefsHookChain implements AdvertiseRefsHook {
59 private final AdvertiseRefsHook[] hooks;
60 private final int count;
61
62 /**
63 * Create a new hook chaining the given hooks together.
64 *
65 * @param hooks
66 * hooks to execute, in order.
67 * @return a new hook chain of the given hooks.
68 */
69 public static AdvertiseRefsHook newChain(List<? extends AdvertiseRefsHook> hooks) {
70 AdvertiseRefsHook[] newHooks = new AdvertiseRefsHook[hooks.size()];
71 int i = 0;
72 for (AdvertiseRefsHook hook : hooks)
73 if (hook != AdvertiseRefsHook.DEFAULT)
74 newHooks[i++] = hook;
75 if (i == 0)
76 return AdvertiseRefsHook.DEFAULT;
77 else if (i == 1)
78 return newHooks[0];
79 else
80 return new AdvertiseRefsHookChain(newHooks, i);
81 }
82
83 /** {@inheritDoc} */
84 @Override
85 public void advertiseRefs(BaseReceivePack rp)
86 throws ServiceMayNotContinueException {
87 for (int i = 0; i < count; i++)
88 hooks[i].advertiseRefs(rp);
89 }
90
91 /** {@inheritDoc} */
92 @Override
93 public void advertiseRefs(UploadPack rp)
94 throws ServiceMayNotContinueException {
95 for (int i = 0; i < count; i++)
96 hooks[i].advertiseRefs(rp);
97 }
98
99 private AdvertiseRefsHookChain(AdvertiseRefsHook[] hooks, int count) {
100 this.hooks = hooks;
101 this.count = count;
102 }
103 }