1 /*
2 * Copyright (C) 2019, Google LLC.
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 package org.eclipse.jgit.transport;
44
45 import java.util.Collections;
46 import java.util.List;
47 import java.util.stream.Collectors;
48
49 /**
50 * {@link org.eclipse.jgit.transport.ProtocolV2Hook} that delegates to a list of
51 * other hooks.
52 * <p>
53 * Hooks are run in the order passed to the constructor. If running a method on
54 * one hook throws an exception, execution of remaining hook methods is aborted.
55 *
56 * @since 5.5
57 */
58 public class ProtocolV2HookChain implements ProtocolV2Hook {
59 private final List<? extends ProtocolV2Hook> hooks;
60
61 /**
62 * Create a new hook chaining the given hooks together.
63 *
64 * @param hooks
65 * hooks to execute, in order.
66 * @return a new hook chain of the given hooks.
67 */
68 public static ProtocolV2Hook newChain(
69 List<? extends ProtocolV2Hook> hooks) {
70 List<? extends ProtocolV2Hook> newHooks = hooks.stream()
71 .filter(hook -> !hook.equals(ProtocolV2Hook.DEFAULT))
72 .collect(Collectors.toList());
73
74 if (newHooks.isEmpty()) {
75 return ProtocolV2Hook.DEFAULT;
76 } else if (newHooks.size() == 1) {
77 return newHooks.get(0);
78 } else {
79 return new ProtocolV2HookChain(newHooks);
80 }
81 }
82
83 @Override
84 public void onCapabilities(CapabilitiesV2Request req)
85 throws ServiceMayNotContinueException {
86 for (ProtocolV2Hook hook : hooks) {
87 hook.onCapabilities(req);
88 }
89 }
90
91 @Override
92 public void onLsRefs(LsRefsV2Request req)
93 throws ServiceMayNotContinueException {
94 for (ProtocolV2Hook hook : hooks) {
95 hook.onLsRefs(req);
96 }
97 }
98
99 @Override
100 public void onFetch(FetchV2Request req)
101 throws ServiceMayNotContinueException {
102 for (ProtocolV2Hook hook : hooks) {
103 hook.onFetch(req);
104 }
105 }
106
107 private ProtocolV2HookChain(List<? extends ProtocolV2Hook> hooks) {
108 this.hooks = Collections.unmodifiableList(hooks);
109 }
110 }