1 /*
2 * Copyright (C) 2010, 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.revwalk;
45
46 import java.io.IOException;
47
48 import org.eclipse.jgit.diff.DiffConfig;
49 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
50 import org.eclipse.jgit.errors.MissingObjectException;
51 import org.eclipse.jgit.treewalk.TreeWalk;
52 import org.eclipse.jgit.treewalk.filter.PathFilter;
53 import org.eclipse.jgit.treewalk.filter.TreeFilter;
54
55 /**
56 * Updates the internal path filter to follow copy/renames.
57 * <p>
58 * This is a special filter that performs {@code AND(path, ANY_DIFF)}, but also
59 * triggers rename detection so that the path node is updated to include a prior
60 * file name as the RevWalk traverses history.
61 *
62 * The renames found will be reported to a {@link RenameCallback} if one is set.
63 * <p>
64 * Results with this filter are unpredictable if the path being followed is a
65 * subdirectory.
66 */
67 public class FollowFilter extends TreeFilter {
68 /**
69 * Create a new tree filter for a user supplied path.
70 * <p>
71 * Path strings are relative to the root of the repository. If the user's
72 * input should be assumed relative to a subdirectory of the repository the
73 * caller must prepend the subdirectory's path prior to creating the filter.
74 * <p>
75 * Path strings use '/' to delimit directories on all platforms.
76 *
77 * @param path
78 * the path to filter on. Must not be the empty string. All
79 * trailing '/' characters will be trimmed before string's length
80 * is checked or is used as part of the constructed filter.
81 * @param cfg
82 * diff config specifying rename detection options.
83 * @return a new filter for the requested path.
84 * @throws IllegalArgumentException
85 * the path supplied was the empty string.
86 * @since 3.0
87 */
88 public static FollowFilter create(String path, DiffConfig cfg) {
89 return new FollowFilter(PathFilter.create(path), cfg);
90 }
91
92 private final PathFilter path;
93 final DiffConfig cfg;
94
95 private RenameCallback renameCallback;
96
97 FollowFilter(final PathFilter path, final DiffConfig cfg) {
98 this.path = path;
99 this.cfg = cfg;
100 }
101
102 /** @return the path this filter matches. */
103 public String getPath() {
104 return path.getPath();
105 }
106
107 @Override
108 public boolean include(final TreeWalk walker)
109 throws MissingObjectException, IncorrectObjectTypeException,
110 IOException {
111 return path.include(walker) && ANY_DIFF.include(walker);
112 }
113
114 @Override
115 public boolean shouldBeRecursive() {
116 return path.shouldBeRecursive() || ANY_DIFF.shouldBeRecursive();
117 }
118
119 @Override
120 public TreeFilter clone() {
121 return new FollowFilter(path.clone(), cfg);
122 }
123
124 @SuppressWarnings("nls")
125 @Override
126 public String toString() {
127 return "(FOLLOW(" + path.toString() + ")" //
128 + " AND " //
129 + ANY_DIFF.toString() + ")";
130 }
131
132 /**
133 * @return the callback to which renames are reported, or <code>null</code>
134 * if none
135 */
136 public RenameCallback getRenameCallback() {
137 return renameCallback;
138 }
139
140 /**
141 * Sets the callback to which renames shall be reported.
142 *
143 * @param callback
144 * the callback to use
145 */
146 public void setRenameCallback(RenameCallback callback) {
147 renameCallback = callback;
148 }
149 }