// 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 com.google.gerrit.extensions.annotations.ExtensionPoint;
import com.google.gerrit.reviewdb.client.Branch;
import org.eclipse.jgit.revwalk.RevCommit;
/**
* Allows to modify the commit message for new commits generated by Rebase Always submit strategy.
*
* <p>Invoked by Gerrit when all information about new commit is already known such as parent(s),
* tree hash, etc, but commit's message can still be modified.
*/
@ExtensionPoint
public interface ChangeMessageModifier {
/**
* Implementation must return non-Null commit message.
*
* <p>mergeTip and original commit are guaranteed to have their body parsed, meaning that their
* commit messages and footers can be accessed.
*
* @param newCommitMessage the new commit message that was result of either
* <ul>
* <li>{@link MergeUtil#createDetailedCommitMessage} called before
* <li>other extensions or plugins implementing the same point and called before.
* </ul>
*
* @param original the commit of the change being submitted. <b>Note that its commit message may
* be different than newCommitMessage argument.</b>
* @param mergeTip the current HEAD of the destination branch, which will be a parent of a new
* commit being generated
* @param destination the branch onto which the change is being submitted
* @return a new not null commit message.
*/
String onSubmit(
String newCommitMessage, RevCommit original, RevCommit mergeTip, Branch.NameKey destination);
}