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;
45
46 import java.util.AbstractSet;
47 import java.util.ArrayList;
48 import java.util.Collection;
49 import java.util.Iterator;
50 import java.util.List;
51
52 /**
53 * Multiple application level mark bits for
54 * {@link org.eclipse.jgit.revwalk.RevObject}s.
55 *
56 * @see RevFlag
57 */
58 public class RevFlagSet extends AbstractSet<RevFlag> {
59 int mask;
60
61 private final List<RevFlag> active;
62
63 /**
64 * Create an empty set of flags.
65 */
66 public RevFlagSet() {
67 active = new ArrayList<>();
68 }
69
70 /**
71 * Create a set of flags, copied from an existing set.
72 *
73 * @param s
74 * the set to copy flags from.
75 */
76 public RevFlagSet(RevFlagSet s) {
77 mask = s.mask;
78 active = new ArrayList<>(s.active);
79 }
80
81 /**
82 * Create a set of flags, copied from an existing collection.
83 *
84 * @param s
85 * the collection to copy flags from.
86 */
87 public RevFlagSet(Collection<RevFlag> s) {
88 this();
89 addAll(s);
90 }
91
92 /** {@inheritDoc} */
93 @Override
94 public boolean contains(Object o) {
95 if (o instanceof RevFlag)
96 return (mask & ((RevFlag) o).mask) != 0;
97 return false;
98 }
99
100 /** {@inheritDoc} */
101 @Override
102 public boolean containsAll(Collection<?> c) {
103 if (c instanceof RevFlagSet) {
104 final int cMask = ((RevFlagSet) c).mask;
105 return (mask & cMask) == cMask;
106 }
107 return super.containsAll(c);
108 }
109
110 /** {@inheritDoc} */
111 @Override
112 public boolean add(RevFlag flag) {
113 if ((mask & flag.mask) != 0)
114 return false;
115 mask |= flag.mask;
116 int p = 0;
117 while (p < active.size() && active.get(p).mask < flag.mask)
118 p++;
119 active.add(p, flag);
120 return true;
121 }
122
123 /** {@inheritDoc} */
124 @Override
125 public boolean remove(Object o) {
126 final RevFlag flag = (RevFlag) o;
127 if ((mask & flag.mask) == 0)
128 return false;
129 mask &= ~flag.mask;
130 for (int i = 0; i < active.size(); i++)
131 if (active.get(i).mask == flag.mask)
132 active.remove(i);
133 return true;
134 }
135
136 /** {@inheritDoc} */
137 @Override
138 public Iterator<RevFlag> iterator() {
139 final Iterator<RevFlag> i = active.iterator();
140 return new Iterator<RevFlag>() {
141 private RevFlag current;
142
143 @Override
144 public boolean hasNext() {
145 return i.hasNext();
146 }
147
148 @Override
149 public RevFlag next() {
150 return current = i.next();
151 }
152
153 @Override
154 public void remove() {
155 mask &= ~current.mask;
156 i.remove();
157 }
158 };
159 }
160
161 /** {@inheritDoc} */
162 @Override
163 public int size() {
164 return active.size();
165 }
166 }