1 /*
2 * Copyright (C) 2013, Robin Rosenberg <robin.rosenberg@dewire.com>
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.treewalk.filter;
45
46 import org.eclipse.jgit.dircache.DirCacheEntry;
47 import org.eclipse.jgit.dircache.DirCacheIterator;
48 import org.eclipse.jgit.treewalk.TreeWalk;
49
50 /**
51 * A filter for extracting changes between two versions of the dircache. In
52 * addition to what {@link TreeFilter#ANY_DIFF} would do, it also detects
53 * changes that will affect decorations and show up in an attempt to commit.
54 */
55 public final class InterIndexDiffFilter extends TreeFilter {
56 private static final int baseTree = 0;
57
58 /**
59 * Predefined InterIndexDiffFilter for finding changes between two dircaches
60 */
61 public static final TreeFilter INSTANCE = new InterIndexDiffFilter();
62
63 @Override
64 public boolean include(final TreeWalk walker) {
65 final int n = walker.getTreeCount();
66 if (n == 1) // Assume they meant difference to empty tree.
67 return true;
68
69 final int m = walker.getRawMode(baseTree);
70 for (int i = 1; i < n; i++) {
71 DirCacheIterator baseDirCache = walker.getTree(baseTree,
72 DirCacheIterator.class);
73 DirCacheIterator newDirCache = walker.getTree(i,
74 DirCacheIterator.class);
75 if (baseDirCache != null && newDirCache != null) {
76 DirCacheEntry baseDci = baseDirCache.getDirCacheEntry();
77 DirCacheEntry newDci = newDirCache.getDirCacheEntry();
78 if (baseDci != null && newDci != null) {
79 if (baseDci.isAssumeValid() != newDci.isAssumeValid())
80 return true;
81 if (baseDci.isAssumeValid()) // && newDci.isAssumeValid()
82 return false;
83 }
84 }
85 if (walker.getRawMode(i) != m || !walker.idEqual(i, baseTree))
86 return true;
87 }
88 return false;
89 }
90
91 @Override
92 public boolean shouldBeRecursive() {
93 return false;
94 }
95
96 @Override
97 public TreeFilter clone() {
98 return this;
99 }
100
101 @Override
102 public String toString() {
103 return "INTERINDEX_DIFF"; //$NON-NLS-1$
104 }
105 }