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// Copyright (C) 2020 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.submit;
import com.google.gerrit.entities.BranchNameKey;
import com.google.gerrit.server.git.CodeReviewCommit;
import com.google.gerrit.server.submit.MergeOpRepoManager.OpenRepo;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import org.eclipse.jgit.lib.Ref;
/**
* Current branch tips, taking into account commits created during the submit process as well as
* submodule updates produced by this class.
*/
class BranchTips {
private final Map<BranchNameKey, CodeReviewCommit> branchTips = new HashMap<>();
/**
* Returns current tip of the branch, taking into account commits created during the submit
* process or submodule updates.
*
* @param branch branch
* @param repo repository to look for the branch if not cached
* @return the current tip. Empty if the branch doesn't exist in the repository
* @throws IOException Cannot access the underlying storage
*/
Optional<CodeReviewCommit> getTip(BranchNameKey branch, OpenRepo repo) throws IOException {
CodeReviewCommit currentCommit;
if (branchTips.containsKey(branch)) {
currentCommit = branchTips.get(branch);
} else {
Ref r = repo.repo.exactRef(branch.branch());
if (r == null) {
return Optional.empty();
}
currentCommit = repo.rw.parseCommit(r.getObjectId());
branchTips.put(branch, currentCommit);
}
return Optional.of(currentCommit);
}
void put(BranchNameKey branch, CodeReviewCommit c) {
branchTips.put(branch, c);
}
}