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Merge "Add a NameRevCommand for describing IDs in terms of refnames"

stable-3.0
Shawn Pearce 12 years ago committed by Gerrit Code Review @ Eclipse.org
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9105e1c9af 30ba407a9a
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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); 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 * @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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