com.google.gerrit.server.git.RepoRefCache Maven / Gradle / Ivy
// 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.git;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.lib.Repository;
/** {@link RefCache} backed directly by a repository. */
public class RepoRefCache implements RefCache {
private final RefDatabase refdb;
private final Map> ids;
public RepoRefCache(Repository repo) {
this.refdb = repo.getRefDatabase();
this.ids = new HashMap<>();
}
@Override
public Optional get(String refName) throws IOException {
Optional id = ids.get(refName);
if (id != null) {
return id;
}
Ref ref = refdb.exactRef(refName);
id = Optional.ofNullable(ref).map(Ref::getObjectId);
ids.put(refName, id);
return id;
}
/** @return an unmodifiable view of the refs that have been cached by this instance. */
public Map> getCachedRefs() {
return Collections.unmodifiableMap(ids);
}
}