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 class BoundaryGenerator extends Generator {
53 static final int UNINTERESTING = RevWalk.UNINTERESTING;
54
55 Generator g;
56
57 BoundaryGenerator(RevWalk w, Generator s) {
58 g = new InitialGenerator(w, s);
59 }
60
61 @Override
62 int outputType() {
63 return g.outputType() | HAS_UNINTERESTING;
64 }
65
66 @Override
67 void shareFreeList(BlockRevQueue q) {
68 g.shareFreeList(q);
69 }
70
71 @Override
72 RevCommit next() throws MissingObjectException,
73 IncorrectObjectTypeException, IOException {
74 return g.next();
75 }
76
77 private class InitialGenerator extends Generator {
78 private static final int PARSED = RevWalk.PARSED;
79
80 private static final int DUPLICATE = RevWalk.TEMP_MARK;
81
82 private final RevWalk walk;
83
84 private final FIFORevQueue held;
85
86 private final Generator source;
87
88 InitialGenerator(RevWalk w, Generator s) {
89 walk = w;
90 held = new FIFORevQueue();
91 source = s;
92 source.shareFreeList(held);
93 }
94
95 @Override
96 int outputType() {
97 return source.outputType();
98 }
99
100 @Override
101 void shareFreeList(BlockRevQueue q) {
102 q.shareFreeList(held);
103 }
104
105 @Override
106 RevCommit next() throws MissingObjectException,
107 IncorrectObjectTypeException, IOException {
108 RevCommit c = source.next();
109 if (c != null) {
110 for (RevCommit p : c.parents)
111 if ((p.flags & UNINTERESTING) != 0)
112 held.add(p);
113 return c;
114 }
115
116 final FIFORevQueue boundary = new FIFORevQueue();
117 boundary.shareFreeList(held);
118 for (;;) {
119 c = held.next();
120 if (c == null)
121 break;
122 if ((c.flags & DUPLICATE) != 0)
123 continue;
124 if ((c.flags & PARSED) == 0)
125 c.parseHeaders(walk);
126 c.flags |= DUPLICATE;
127 boundary.add(c);
128 }
129 boundary.removeFlag(DUPLICATE);
130 g = boundary;
131 return boundary.next();
132 }
133 }
134 }