1 /*
2 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
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.revwalk.filter;
45
46 import java.util.regex.Pattern;
47
48 import org.eclipse.jgit.internal.JGitText;
49 import org.eclipse.jgit.revwalk.RevCommit;
50 import org.eclipse.jgit.util.RawCharSequence;
51 import org.eclipse.jgit.util.RawParseUtils;
52
53 /**
54 * Matches only commits whose message matches the pattern.
55 */
56 public class MessageRevFilter {
57 /**
58 * Create a message filter.
59 * <p>
60 * An optimized substring search may be automatically selected if the
61 * pattern does not contain any regular expression meta-characters.
62 * <p>
63 * The search is performed using a case-insensitive comparison. The
64 * character encoding of the commit message itself is not respected. The
65 * filter matches on raw UTF-8 byte sequences.
66 *
67 * @param pattern
68 * regular expression pattern to match.
69 * @return a new filter that matches the given expression against the
70 * message body of the commit.
71 */
72 public static RevFilter create(String pattern) {
73 if (pattern.length() == 0)
74 throw new IllegalArgumentException(JGitText.get().cannotMatchOnEmptyString);
75 if (SubStringRevFilter.safe(pattern))
76 return new SubStringSearch(pattern);
77 return new PatternSearch(pattern);
78 }
79
80 private MessageRevFilter() {
81 // Don't permit us to be created.
82 }
83
84 static RawCharSequence textFor(RevCommit cmit) {
85 final byte[] raw = cmit.getRawBuffer();
86 final int b = RawParseUtils.commitMessage(raw, 0);
87 if (b < 0)
88 return RawCharSequence.EMPTY;
89 return new RawCharSequence(raw, b, raw.length);
90 }
91
92 private static class PatternSearch extends PatternMatchRevFilter {
93 PatternSearch(String patternText) {
94 super(patternText, true, true, Pattern.CASE_INSENSITIVE
95 | Pattern.DOTALL);
96 }
97
98 @Override
99 protected CharSequence text(RevCommit cmit) {
100 return textFor(cmit);
101 }
102
103 @Override
104 public RevFilter clone() {
105 return new PatternSearch(pattern());
106 }
107 }
108
109 private static class SubStringSearch extends SubStringRevFilter {
110 SubStringSearch(String patternText) {
111 super(patternText);
112 }
113
114 @Override
115 protected RawCharSequence text(RevCommit cmit) {
116 return textFor(cmit);
117 }
118 }
119 }