1 /*
2 * Copyright (C) 2009, 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.revwalk;
46
47 import java.io.IOException;
48
49 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
50 import org.eclipse.jgit.errors.MissingObjectException;
51
52 /**
53 * A queue of commits in LIFO order.
54 */
55 public class LIFORevQueue extends BlockRevQueue {
56 private Block head;
57
58 /**
59 * Create an empty LIFO queue.
60 */
61 public LIFORevQueue() {
62 super();
63 }
64
65 LIFORevQueue(Generator s) throws MissingObjectException,
66 IncorrectObjectTypeException, IOException {
67 super(s);
68 }
69
70 /** {@inheritDoc} */
71 @Override
72 public void add(RevCommit c) {
73 Block b = head;
74 if (b == null || !b.canUnpop()) {
75 b = free.newBlock();
76 b.resetToEnd();
77 b.next = head;
78 head = b;
79 }
80 b.unpop(c);
81 }
82
83 /** {@inheritDoc} */
84 @Override
85 public RevCommit next() {
86 final Block b = head;
87 if (b == null)
88 return null;
89
90 final RevCommit c = b.pop();
91 if (b.isEmpty()) {
92 head = b.next;
93 free.freeBlock(b);
94 }
95 return c;
96 }
97
98 /** {@inheritDoc} */
99 @Override
100 public void clear() {
101 head = null;
102 free.clear();
103 }
104
105 @Override
106 boolean everbodyHasFlag(int f) {
107 for (Block b = head; b != null; b = b.next) {
108 for (int i = b.headIndex; i < b.tailIndex; i++)
109 if ((b.commits[i].flags & f) == 0)
110 return false;
111 }
112 return true;
113 }
114
115 @Override
116 boolean anybodyHasFlag(int f) {
117 for (Block b = head; b != null; b = b.next) {
118 for (int i = b.headIndex; i < b.tailIndex; i++)
119 if ((b.commits[i].flags & f) != 0)
120 return true;
121 }
122 return false;
123 }
124
125 /** {@inheritDoc} */
126 @Override
127 public String toString() {
128 final StringBuilder s = new StringBuilder();
129 for (Block q = head; q != null; q = q.next) {
130 for (int i = q.headIndex; i < q.tailIndex; i++)
131 describe(s, q.commits[i]);
132 }
133 return s.toString();
134 }
135 }