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The FollowFilter can be installed on a RevWalk to cause the path to be updated through rename detection when the affected file is found to be added to the project. The filter works reasonably well, for example we can follow the history of the fsck command in git-core: $ jgit log --name-status --follow builtin/fsck.c | grep ^R R100 builtin-fsck.c builtin/fsck.c R099 fsck.c builtin-fsck.c R099 fsck-objects.c fsck.c R099 fsck-cache.c fsck-objects.c Change-Id: I4017bcfd150126aa342fdd423a688493ca660a1f Signed-off-by: Shawn O. Pearce <spearce@spearce.org>stable-0.9
Shawn O. Pearce
15 years ago
5 changed files with 233 additions and 13 deletions
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/* |
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* Copyright (C) 2010, Google Inc. |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* names of its contributors may be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.revwalk; |
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import java.io.IOException; |
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import org.eclipse.jgit.errors.IncorrectObjectTypeException; |
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import org.eclipse.jgit.errors.MissingObjectException; |
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import org.eclipse.jgit.treewalk.TreeWalk; |
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import org.eclipse.jgit.treewalk.filter.PathFilter; |
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import org.eclipse.jgit.treewalk.filter.TreeFilter; |
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/** |
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* Updates the internal path filter to follow copy/renames. |
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* <p> |
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* This is a special filter that performs {@code AND(path, ANY_DIFF)}, but also |
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* triggers rename detection so that the path node is updated to include a prior |
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* file name as the RevWalk traverses history. |
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* <p> |
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* Results with this filter are unpredictable if the path being followed is a |
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* subdirectory. |
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*/ |
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public class FollowFilter extends TreeFilter { |
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/** |
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* Create a new tree filter for a user supplied path. |
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* <p> |
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* Path strings are relative to the root of the repository. If the user's |
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* input should be assumed relative to a subdirectory of the repository the |
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* caller must prepend the subdirectory's path prior to creating the filter. |
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* <p> |
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* Path strings use '/' to delimit directories on all platforms. |
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* |
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* @param path |
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* the path to filter on. Must not be the empty string. All |
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* trailing '/' characters will be trimmed before string's length |
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* is checked or is used as part of the constructed filter. |
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* @return a new filter for the requested path. |
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* @throws IllegalArgumentException |
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* the path supplied was the empty string. |
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*/ |
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public static FollowFilter create(String path) { |
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return new FollowFilter(PathFilter.create(path)); |
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} |
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private final PathFilter path; |
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FollowFilter(final PathFilter path) { |
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this.path = path; |
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} |
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/** @return the path this filter matches. */ |
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public String getPath() { |
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return path.getPath(); |
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} |
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@Override |
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public boolean include(final TreeWalk walker) |
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throws MissingObjectException, IncorrectObjectTypeException, |
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IOException { |
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return path.include(walker) && ANY_DIFF.include(walker); |
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} |
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@Override |
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public boolean shouldBeRecursive() { |
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return path.shouldBeRecursive() || ANY_DIFF.shouldBeRecursive(); |
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} |
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@Override |
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public TreeFilter clone() { |
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return new FollowFilter(path.clone()); |
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} |
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@Override |
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public String toString() { |
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return "(FOLLOW(" + path.toString() + ")" //
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+ " AND " //
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+ ANY_DIFF.toString() + ")"; |
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} |
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} |
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