blob: a019d0f74890e143c1e98d566860c4ab24d5e4cd [file] [log] [blame]
// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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.gitiles;
import com.google.common.base.Throwables;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevTag;
import org.eclipse.jgit.revwalk.RevWalk;
/**
* Cache of the time associated with Git objects.
*
* <p>Uses the time as stored in annotated tags if available, or else the commit time of the tagged
* commit. Non-commits are given {@link Long#MIN_VALUE}, rather than searching for occurrences in
* the entire repository.
*/
public class TimeCache {
public static CacheBuilder<Object, Object> defaultBuilder() {
return CacheBuilder.newBuilder().maximumSize(10 << 10);
}
private final Cache<ObjectId, Long> cache;
public TimeCache() {
this(defaultBuilder());
}
public TimeCache(CacheBuilder<Object, Object> builder) {
this.cache = builder.build();
}
public Cache<?, ?> getCache() {
return cache;
}
Long getTime(final RevWalk walk, final ObjectId id) throws IOException {
try {
return cache.get(
id,
() -> {
RevObject o = walk.parseAny(id);
while (o instanceof RevTag) {
RevTag tag = (RevTag) o;
PersonIdent ident = tag.getTaggerIdent();
if (ident != null) {
return ident.getWhen().getTime() / 1000;
}
o = tag.getObject();
walk.parseHeaders(o);
}
if (o.getType() == Constants.OBJ_COMMIT) {
return Long.valueOf(((RevCommit) o).getCommitTime());
}
return Long.MIN_VALUE;
});
} catch (ExecutionException e) {
Throwables.throwIfInstanceOf(e.getCause(), IOException.class);
throw new IOException(e);
}
}
}