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Add a NameRevCommand for describing IDs in terms of refnames 

The walk logic does not use RevWalk because it needs to walk all paths
to each of the requested commits, keeping track of each path along which
the commit was found in the RevCommit subclass. From these paths, a
single "best" path is chosen based on the total path length, with a
penalty applied for paths that traverse merges.

This functionality parallels "git name-rev".

Change-Id: I92bfb47dd16c898313d2ee525395609c3bf72ebe
stable-3.0
Dave Borowitz 12 years ago
parent
13ea3b0957
commit
30ba407a9a
3 changed files with 511 additions and 0 deletions
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  1. 173
      org.eclipse.jgit.test/tst/org/eclipse/jgit/api/NameRevCommandTest.java
  2. 10
      org.eclipse.jgit/src/org/eclipse/jgit/api/Git.java
  3. 328
      org.eclipse.jgit/src/org/eclipse/jgit/api/NameRevCommand.java

173
org.eclipse.jgit.test/tst/org/eclipse/jgit/api/NameRevCommandTest.java
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@ -0,0 +1,173 @@
/*
* Copyright (C) 2013, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.api;
import static org.junit.Assert.assertEquals;
import java.util.Map;
import org.eclipse.jgit.junit.RepositoryTestCase;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.junit.Before;
import org.junit.Test;
public class NameRevCommandTest extends RepositoryTestCase {
private TestRepository<Repository> tr;
private Git git;
@Override
@Before
public void setUp() throws Exception {
super.setUp();
tr = new TestRepository<Repository>(db);
git = new Git(db);
}
@Test
public void nameExact() throws Exception {
RevCommit c = tr.commit().create();
tr.update("master", c);
assertOneResult("master", c);
}
@Test
public void prefix() throws Exception {
RevCommit c = tr.commit().create();
tr.update("refs/heads/master", c);
tr.update("refs/tags/tag", c);
assertOneResult("master", c);
assertOneResult("master",
git.nameRev().addPrefix("refs/heads/").addPrefix("refs/tags/"),
c);
assertOneResult("tag",
git.nameRev().addPrefix("refs/tags/").addPrefix("refs/heads/"),
c);
}
@Test
public void simpleAncestor() throws Exception {
// 0--1--2
RevCommit c0 = tr.commit().create();
RevCommit c1 = tr.commit().parent(c0).create();
RevCommit c2 = tr.commit().parent(c1).create();
tr.update("master", c2);
Map<ObjectId, String> result = git.nameRev().add(c0).add(c1).add(c2).call();
assertEquals(3, result.size());
assertEquals("master~2", result.get(c0));
assertEquals("master~1", result.get(c1));
assertEquals("master", result.get(c2));
}
@Test
public void multiplePathsNoMerge() throws Exception {
// 0--1 <- master
// \-2--3 <- branch
RevCommit c0 = tr.commit().create();
RevCommit c1 = tr.commit().parent(c0).create();
RevCommit c2 = tr.commit().parent(c0).create();
RevCommit c3 = tr.commit().parent(c2).create();
tr.update("master", c1);
tr.update("branch", c3);
assertOneResult("master~1", c0);
}
@Test
public void onePathMerge() throws Exception {
// 0--1--3
// \-2-/
RevCommit c0 = tr.commit().create();
RevCommit c1 = tr.commit().parent(c0).create();
RevCommit c2 = tr.commit().parent(c0).create();
RevCommit c3 = tr.commit().parent(c1).parent(c2).create();
tr.update("master", c3);
assertOneResult("master^1~1", c0);
}
@Test
public void oneMergeDifferentLengths() throws Exception {
// 0--1--2--4
// \--3---/
RevCommit c0 = tr.commit().create();
RevCommit c1 = tr.commit().parent(c0).create();
RevCommit c2 = tr.commit().parent(c1).create();
RevCommit c3 = tr.commit().parent(c0).create();
RevCommit c4 = tr.commit().parent(c2).parent(c3).create();
tr.update("master", c4);
assertOneResult("master^2~1", c0);
}
@Test
public void longerPathWithoutMerge() throws Exception {
// 0--1--2--4 <- master
// \ \-3-/
// \--5--6--7--8--9 <- branch
RevCommit c0 = tr.commit().create();
RevCommit c1 = tr.commit().parent(c0).create();
RevCommit c2 = tr.commit().parent(c1).create();
RevCommit c3 = tr.commit().parent(c1).create();
RevCommit c4 = tr.commit().parent(c2).parent(c3).create();
RevCommit c5 = tr.commit().parent(c0).create();
RevCommit c6 = tr.commit().parent(c5).create();
RevCommit c7 = tr.commit().parent(c6).create();
RevCommit c8 = tr.commit().parent(c7).create();
RevCommit c9 = tr.commit().parent(c8).create();
tr.update("master", c4);
tr.update("branch", c9);
assertOneResult("branch~5", c0);
}
private static void assertOneResult(String expected, NameRevCommand nameRev,
ObjectId id) throws Exception {
Map<ObjectId, String> result = nameRev.add(id).call();
assertEquals(1, result.size());
assertEquals(expected, result.get(id));
}
private void assertOneResult(String expected, ObjectId id) throws Exception {
assertOneResult(expected, git.nameRev(), id);
}
}

10
org.eclipse.jgit/src/org/eclipse/jgit/api/Git.java
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@ -632,6 +632,16 @@ public class Git {
return new GarbageCollectCommand(repo);
}
/**
* Returns a command object to find human-readable names of revisions.
*
* @return a {@link NameRevCommand}.
* @since 2.3
*/
public NameRevCommand nameRev() {
return new NameRevCommand(repo);
}
/**
* @return the git repository this class is interacting with
*/

328
org.eclipse.jgit/src/org/eclipse/jgit/api/NameRevCommand.java
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@ -0,0 +1,328 @@
/*
* Copyright (C) 2013, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.api;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.FIFORevQueue;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevTag;
import org.eclipse.jgit.revwalk.RevWalk;
/**
* Command to find human-readable names of revisions.
*
* @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-name-rev.html"
* >Git documentation about name-rev</a>
*/
public class NameRevCommand extends GitCommand<Map<ObjectId, String>> {
/** Amount of slop to allow walking past the earliest requested commit. */
private static final int COMMIT_TIME_SLOP = 60 * 60 * 24;
/** Cost of traversing a merge commit compared to a linear history. */
private static final int MERGE_COST = 65535;
private static class NameRevCommit extends RevCommit {
private String tip;
private int distance;
private long cost;
private NameRevCommit(AnyObjectId id) {
super(id);
}
private StringBuilder format() {
StringBuilder sb = new StringBuilder(tip);
if (distance > 0)
sb.append('~').append(distance);
return sb;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(getClass().getSimpleName())
.append('[');
if (tip != null)
sb.append(format());
else
sb.append(String.valueOf(null));
sb.append(',').append(cost).append(']').append(' ')
.append(super.toString()).toString();
return sb.toString();
}
}
private final RevWalk walk;
private final List<String> prefixes;
private final List<ObjectId> revs;
/**
* Create a new name-rev command.
*
* @param repo
*/
protected NameRevCommand(Repository repo) {
super(repo);
prefixes = new ArrayList<String>(2);
revs = new ArrayList<ObjectId>(2);
walk = new RevWalk(repo) {
@Override
public NameRevCommit createCommit(AnyObjectId id) {
return new NameRevCommit(id);
}
};
}
@Override
public Map<ObjectId, String> call() throws GitAPIException {
try {
Map<ObjectId, String> nonCommits = new HashMap<ObjectId, String>();
FIFORevQueue pending = new FIFORevQueue();
addPrefixes(nonCommits, pending);
int cutoff = minCommitTime() - COMMIT_TIME_SLOP;
while (true) {
NameRevCommit c = (NameRevCommit) pending.next();
if (c == null)
break;
if (c.getCommitTime() < cutoff)
continue;
boolean merge = c.getParentCount() > 1;
long cost = c.cost + (merge ? MERGE_COST : 1);
for (int i = 0; i < c.getParentCount(); i++) {
NameRevCommit p = (NameRevCommit) walk.parseCommit(c.getParent(i));
if (p.tip == null || compare(c.tip, cost, p.tip, p.cost) < 0) {
if (merge) {
p.tip = c.format().append('^').append(i + 1).toString();
p.distance = 0;
} else {
p.tip = c.tip;
p.distance = c.distance + 1;
}
p.cost = cost;
pending.add(p);
}
}
}
Map<ObjectId, String> result =
new LinkedHashMap<ObjectId, String>(revs.size());
for (ObjectId id : revs) {
RevObject o = walk.parseAny(id);
if (o instanceof NameRevCommit) {
NameRevCommit c = (NameRevCommit) o;
if (c.tip != null)
result.put(id, simplify(c.format().toString()));
} else {
String name = nonCommits.get(id);
if (name != null)
result.put(id, simplify(name));
}
}
setCallable(false);
walk.release();
return result;
} catch (IOException e) {
walk.reset();
throw new JGitInternalException(e.getMessage(), e);
}
}
/**
* Add an object to search for.
*
* @param id
* object ID to add.
* @return {@code this}
* @throws MissingObjectException
* the object supplied is not available from the object
* database.
* @throws JGitInternalException
* a low-level exception of JGit has occurred. The original
* exception can be retrieved by calling
* {@link Exception#getCause()}.
*/
public NameRevCommand add(ObjectId id) throws MissingObjectException,
JGitInternalException {
checkCallable();
try {
walk.parseAny(id);
} catch (MissingObjectException e) {
throw e;
} catch (IOException e) {
throw new JGitInternalException(e.getMessage(), e);
}
revs.add(id.copy());
return this;
}
/**
* Add multiple objects to search for.
*
* @param ids
* object IDs to add.
* @return {@code this}
* @throws MissingObjectException
* the object supplied is not available from the object
* database.
* @throws JGitInternalException
* a low-level exception of JGit has occurred. The original
* exception can be retrieved by calling
* {@link Exception#getCause()}.
*/
public NameRevCommand add(Iterable<ObjectId> ids)
throws MissingObjectException, JGitInternalException {
for (ObjectId id : ids)
add(id);
return this;
}
/**
* Add a ref prefix that all results must match.
* <p>
* If an object matches refs under multiple prefixes equally well, the first
* prefix added to this command is preferred.
*
* @param prefix
* prefix to add; see {@link RefDatabase#getRefs(String)}
* @return {@code this}
*/
public NameRevCommand addPrefix(String prefix) {
checkCallable();
prefixes.add(prefix);
return this;
}
private void addPrefixes(Map<ObjectId, String> nonCommits,
FIFORevQueue pending) throws IOException {
if (!prefixes.isEmpty()) {
for (String prefix : prefixes)
addPrefix(prefix, nonCommits, pending);
} else
addPrefix(Constants.R_REFS, nonCommits, pending);
}
private void addPrefix(String prefix, Map<ObjectId, String> nonCommits,
FIFORevQueue pending) throws IOException {
for (Ref ref : repo.getRefDatabase().getRefs(prefix).values()) {
if (ref.getObjectId() == null)
continue;
RevObject o = walk.parseAny(ref.getObjectId());
while (o instanceof RevTag) {
RevTag t = (RevTag) o;
nonCommits.put(o, ref.getName());
o = t.getObject();
walk.parseHeaders(o);
}
if (o instanceof NameRevCommit) {
NameRevCommit c = (NameRevCommit) o;
if (c.tip == null)
c.tip = ref.getName();
pending.add(c);
} else if (!nonCommits.containsKey(o))
nonCommits.put(o, ref.getName());
}
}
private int minCommitTime() throws IOException {
int min = Integer.MAX_VALUE;
for (ObjectId id : revs) {
RevObject o = walk.parseAny(id);
while (o instanceof RevTag) {
o = ((RevTag) o).getObject();
walk.parseHeaders(o);
}
if (o instanceof RevCommit) {
RevCommit c = (RevCommit) o;
if (c.getCommitTime() < min)
min = c.getCommitTime();
}
}
return min;
}
private long compare(String leftTip, long leftCost, String rightTip, long rightCost) {
long c = leftCost - rightCost;
if (c != 0 || prefixes.isEmpty())
return c;
int li = -1;
int ri = -1;
for (int i = 0; i < prefixes.size(); i++) {
String prefix = prefixes.get(i);
if (li < 0 && leftTip.startsWith(prefix))
li = i;
if (ri < 0 && rightTip.startsWith(prefix))
ri = i;
}
// Don't tiebreak if prefixes are the same, in order to prefer first-parent
// paths.
return li - ri;
}
private static String simplify(String refName) {
if (refName.startsWith(Constants.R_HEADS))
return refName.substring(Constants.R_HEADS.length());
if (refName.startsWith(Constants.R_TAGS))
return refName.substring(Constants.R_TAGS.length());
if (refName.startsWith(Constants.R_REFS))
return refName.substring(Constants.R_REFS.length());
return refName;
}
}
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