View Javadoc
1   /*
2    * Copyright (C) 2013, Robin Rosenberg <robin.rosenberg@dewire.com> and others
3    *
4    * This program and the accompanying materials are made available under the
5    * terms of the Eclipse Distribution License v. 1.0 which is available at
6    * https://www.eclipse.org/org/documents/edl-v10.php.
7    *
8    * SPDX-License-Identifier: BSD-3-Clause
9    */
10  
11  package org.eclipse.jgit.treewalk.filter;
12  
13  import org.eclipse.jgit.dircache.DirCacheEntry;
14  import org.eclipse.jgit.dircache.DirCacheIterator;
15  import org.eclipse.jgit.treewalk.TreeWalk;
16  
17  /**
18   * A filter for extracting changes between two versions of the dircache. In
19   * addition to what {@link org.eclipse.jgit.treewalk.filter.TreeFilter#ANY_DIFF}
20   * would do, it also detects changes that will affect decorations and show up in
21   * an attempt to commit.
22   */
23  public final class InterIndexDiffFilter extends TreeFilter {
24  	private static final int baseTree = 0;
25  
26  	/**
27  	 * Predefined InterIndexDiffFilter for finding changes between two dircaches
28  	 */
29  	public static final TreeFilter INSTANCE = new InterIndexDiffFilter();
30  
31  	/** {@inheritDoc} */
32  	@Override
33  	public boolean include(TreeWalk walker) {
34  		final int n = walker.getTreeCount();
35  		if (n == 1) // Assume they meant difference to empty tree.
36  			return true;
37  
38  		final int m = walker.getRawMode(baseTree);
39  		for (int i = 1; i < n; i++) {
40  			DirCacheIterator baseDirCache = walker.getTree(baseTree,
41  					DirCacheIterator.class);
42  			DirCacheIterator newDirCache = walker.getTree(i,
43  					DirCacheIterator.class);
44  			if (baseDirCache != null && newDirCache != null) {
45  				DirCacheEntry baseDci = baseDirCache.getDirCacheEntry();
46  				DirCacheEntry newDci = newDirCache.getDirCacheEntry();
47  				if (baseDci != null && newDci != null) {
48  					if (baseDci.isAssumeValid() != newDci.isAssumeValid())
49  						return true;
50  					if (baseDci.isAssumeValid()) // && newDci.isAssumeValid()
51  						return false;
52  				}
53  			}
54  			if (walker.getRawMode(i) != m || !walker.idEqual(i, baseTree))
55  				return true;
56  		}
57  		return false;
58  	}
59  
60  	/** {@inheritDoc} */
61  	@Override
62  	public boolean shouldBeRecursive() {
63  		return false;
64  	}
65  
66  	/** {@inheritDoc} */
67  	@Override
68  	public TreeFilter clone() {
69  		return this;
70  	}
71  
72  	/** {@inheritDoc} */
73  	@Override
74  	public String toString() {
75  		return "INTERINDEX_DIFF"; //$NON-NLS-1$
76  	}
77  }