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.io.IOException;
47
48 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
49 import org.eclipse.jgit.errors.MissingObjectException;
50 import org.eclipse.jgit.revwalk.RevCommit;
51 import org.eclipse.jgit.revwalk.RevWalk;
52
53 /**
54 * Includes a commit only if the subfilter does not include the commit.
55 */
56 public class NotRevFilter extends RevFilter {
57 /**
58 * Create a filter that negates the result of another filter.
59 *
60 * @param a
61 * filter to negate.
62 * @return a filter that does the reverse of <code>a</code>.
63 */
64 public static RevFilter create(RevFilter a) {
65 return new NotRevFilter(a);
66 }
67
68 private final RevFilter a;
69
70 private NotRevFilter(RevFilter one) {
71 a = one;
72 }
73
74 /** {@inheritDoc} */
75 @Override
76 public RevFilter negate() {
77 return a;
78 }
79
80 /** {@inheritDoc} */
81 @Override
82 public boolean include(RevWalk walker, RevCommit c)
83 throws MissingObjectException, IncorrectObjectTypeException,
84 IOException {
85 return !a.include(walker, c);
86 }
87
88 /** {@inheritDoc} */
89 @Override
90 public boolean requiresCommitBody() {
91 return a.requiresCommitBody();
92 }
93
94 /** {@inheritDoc} */
95 @Override
96 public RevFilter clone() {
97 return new NotRevFilter(a.clone());
98 }
99
100 /** {@inheritDoc} */
101 @Override
102 public String toString() {
103 return "NOT " + a.toString(); //$NON-NLS-1$
104 }
105 }