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// Copyright (C) 2016 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.server.notedb;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.MultimapBuilder;
import com.google.gerrit.server.git.InMemoryInserter;
import com.google.gerrit.server.git.InsertedObject;
import java.io.IOException;
import java.util.List;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.FooterKey;
import org.eclipse.jgit.revwalk.FooterLine;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
/**
* Commit implementation with some optimizations for change notes parsing.
*
* <p>
*
* <ul>
* <li>Caches the result of {@link #getFooterLines()}, which is otherwise very wasteful with
* allocations.
* </ul>
*/
public class ChangeNotesCommit extends RevCommit {
public static ChangeNotesRevWalk newRevWalk(Repository repo) {
return new ChangeNotesRevWalk(repo);
}
public static ChangeNotesRevWalk newStagedRevWalk(
Repository repo, Iterable<InsertedObject> stagedObjs) {
final InMemoryInserter ins = new InMemoryInserter(repo);
for (InsertedObject obj : stagedObjs) {
ins.insert(obj);
}
return new ChangeNotesRevWalk(ins.newReader()) {
@Override
public void close() {
ins.close();
super.close();
}
};
}
public static class ChangeNotesRevWalk extends RevWalk {
private ChangeNotesRevWalk(Repository repo) {
super(repo);
}
private ChangeNotesRevWalk(ObjectReader reader) {
super(reader);
}
@Override
protected ChangeNotesCommit createCommit(AnyObjectId id) {
return new ChangeNotesCommit(id);
}
@Override
public ChangeNotesCommit next()
throws MissingObjectException, IncorrectObjectTypeException, IOException {
return (ChangeNotesCommit) super.next();
}
@Override
public void markStart(RevCommit c)
throws MissingObjectException, IncorrectObjectTypeException, IOException {
checkArgument(c instanceof ChangeNotesCommit);
super.markStart(c);
}
@Override
public void markUninteresting(RevCommit c)
throws MissingObjectException, IncorrectObjectTypeException, IOException {
checkArgument(c instanceof ChangeNotesCommit);
super.markUninteresting(c);
}
@Override
public ChangeNotesCommit lookupCommit(AnyObjectId id) {
return (ChangeNotesCommit) super.lookupCommit(id);
}
@Override
public ChangeNotesCommit parseCommit(AnyObjectId id)
throws MissingObjectException, IncorrectObjectTypeException, IOException {
return (ChangeNotesCommit) super.parseCommit(id);
}
}
private ListMultimap<String, String> footerLines;
public ChangeNotesCommit(AnyObjectId id) {
super(id);
}
public List<String> getFooterLineValues(FooterKey key) {
if (footerLines == null) {
List<FooterLine> src = getFooterLines();
footerLines = MultimapBuilder.hashKeys(src.size()).arrayListValues(1).build();
for (FooterLine fl : src) {
footerLines.put(fl.getKey().toLowerCase(), fl.getValue());
}
}
return footerLines.get(key.getName().toLowerCase());
}
}
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