1 /*
2 * Copyright (C) 2011, 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.Collection;
47 import java.util.List;
48
49 import org.eclipse.jgit.lib.ObjectId;
50
51 /**
52 * {@link org.eclipse.jgit.transport.PreUploadHook} that delegates to a list of
53 * other hooks.
54 * <p>
55 * Hooks are run in the order passed to the constructor. If running a method on
56 * one hook throws an exception, execution of remaining hook methods is aborted.
57 */
58 public class PreUploadHookChain implements PreUploadHook {
59 private final PreUploadHook[] 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 PreUploadHook newChain(List<? extends PreUploadHook> hooks) {
70 PreUploadHook[] newHooks = new PreUploadHook[hooks.size()];
71 int i = 0;
72 for (PreUploadHook hook : hooks)
73 if (hook != PreUploadHook.NULL)
74 newHooks[i++] = hook;
75 if (i == 0)
76 return PreUploadHook.NULL;
77 else if (i == 1)
78 return newHooks[0];
79 else
80 return new PreUploadHookChain(newHooks, i);
81 }
82
83 /** {@inheritDoc} */
84 @Override
85 public void onBeginNegotiateRound(UploadPack up,
86 Collection<? extends ObjectId> wants, int cntOffered)
87 throws ServiceMayNotContinueException {
88 for (int i = 0; i < count; i++)
89 hooks[i].onBeginNegotiateRound(up, wants, cntOffered);
90 }
91
92 /** {@inheritDoc} */
93 @Override
94 public void onEndNegotiateRound(UploadPack up,
95 Collection<? extends ObjectId> wants, int cntCommon,
96 int cntNotFound, boolean ready)
97 throws ServiceMayNotContinueException {
98 for (int i = 0; i < count; i++)
99 hooks[i].onEndNegotiateRound(up, wants, cntCommon, cntNotFound, ready);
100 }
101
102 /** {@inheritDoc} */
103 @Override
104 public void onSendPack(UploadPack up,
105 Collection<? extends ObjectId> wants,
106 Collection<? extends ObjectId> haves)
107 throws ServiceMayNotContinueException {
108 for (int i = 0; i < count; i++)
109 hooks[i].onSendPack(up, wants, haves);
110 }
111
112 private PreUploadHookChain(PreUploadHook[] hooks, int count) {
113 this.hooks = hooks;
114 this.count = count;
115 }
116 }