1 /*
2 * Copyright (C) 2008, Google Inc.
3 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
4 * and other copyright owners as documented in the project's IP log.
5 *
6 * This program and the accompanying materials are made available
7 * under the terms of the Eclipse Distribution License v1.0 which
8 * accompanies this distribution, is reproduced below, and is
9 * available at http://www.eclipse.org/org/documents/edl-v10.php
10 *
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials provided
23 * with the distribution.
24 *
25 * - Neither the name of the Eclipse Foundation, Inc. nor the
26 * names of its contributors may be used to endorse or promote
27 * products derived from this software without specific prior
28 * written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
31 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
32 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
35 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
37 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
38 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
39 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
41 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
42 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 */
44
45 package org.eclipse.jgit.treewalk.filter;
46
47 import java.io.IOException;
48
49 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
50 import org.eclipse.jgit.errors.MissingObjectException;
51 import org.eclipse.jgit.treewalk.TreeWalk;
52
53 /**
54 * Includes an entry only if the subfilter does not include the entry.
55 */
56 public class NotTreeFilter extends TreeFilter {
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 TreeFilter./../../../../org/eclipse/jgit/treewalk/filter/TreeFilter.html#TreeFilter">TreeFilter create(TreeFilter a) {
65 return new NotTreeFilter(a);
66 }
67
68 private final TreeFilter a;
69
70 private NotTreeFilter(TreeFilter one) {
71 a = one;
72 }
73
74 /** {@inheritDoc} */
75 @Override
76 public TreeFilter negate() {
77 return a;
78 }
79
80 /** {@inheritDoc} */
81 @Override
82 public boolean include(TreeWalk walker)
83 throws MissingObjectException, IncorrectObjectTypeException,
84 IOException {
85 return matchFilter(walker) == 0;
86 }
87
88 /** {@inheritDoc} */
89 @Override
90 public int matchFilter(TreeWalk walker)
91 throws MissingObjectException, IncorrectObjectTypeException,
92 IOException {
93 final int r = a.matchFilter(walker);
94 // switch 0 and 1, keep -1 as that defines a subpath that must be
95 // traversed before a final verdict can be made.
96 if (r == 0) {
97 return 1;
98 }
99 if (r == 1) {
100 return 0;
101 }
102 return -1;
103 }
104
105 /** {@inheritDoc} */
106 @Override
107 public boolean shouldBeRecursive() {
108 return a.shouldBeRecursive();
109 }
110
111 /** {@inheritDoc} */
112 @Override
113 public TreeFilter clone() {
114 final TreeFilter n = a.clone();
115 return n == a ? this : new NotTreeFilter(n);
116 }
117
118 /** {@inheritDoc} */
119 @Override
120 public String toString() {
121 return "NOT " + a.toString(); //$NON-NLS-1$
122 }
123 }