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// Copyright (C) 2012 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.common.flogger.FluentLogger;
import com.google.gerrit.entities.BranchNameKey;
import com.google.gerrit.entities.SubmissionId;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.extensions.api.changes.SubmitInput;
import com.google.gerrit.extensions.client.SubmitType;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.git.CodeReviewCommit;
import com.google.gerrit.server.git.CodeReviewCommit.CodeReviewRevWalk;
import com.google.gerrit.server.git.MergeTip;
import com.google.gerrit.server.submit.MergeOp.CommitStatus;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.util.Set;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevFlag;

/** Factory to create a {@link SubmitStrategy} for a {@link SubmitType}. */
@Singleton
public class SubmitStrategyFactory {
  private static final FluentLogger logger = FluentLogger.forEnclosingClass();

  private final SubmitStrategy.Arguments.Factory argsFactory;

  @Inject
  SubmitStrategyFactory(SubmitStrategy.Arguments.Factory argsFactory) {
    this.argsFactory = argsFactory;
  }

  public SubmitStrategy create(
      SubmitType submitType,
      CodeReviewRevWalk rw,
      RevFlag canMergeFlag,
      Set alreadyAccepted,
      Set incoming,
      BranchNameKey destBranch,
      IdentifiedUser caller,
      MergeTip mergeTip,
      CommitStatus commitStatus,
      SubmissionId submissionId,
      SubmitInput submitInput,
      SubmoduleCommits submoduleCommits,
      SubscriptionGraph subscriptionGraph,
      boolean dryrun) {
    SubmitStrategy.Arguments args =
        argsFactory.create(
            submitType,
            destBranch,
            commitStatus,
            rw,
            caller,
            mergeTip,
            canMergeFlag,
            alreadyAccepted,
            incoming,
            submissionId,
            submitInput,
            submoduleCommits,
            subscriptionGraph,
            dryrun);
    switch (submitType) {
      case CHERRY_PICK:
        return new CherryPick(args);
      case FAST_FORWARD_ONLY:
        return new FastForwardOnly(args);
      case MERGE_ALWAYS:
        return new MergeAlways(args);
      case MERGE_IF_NECESSARY:
        return new MergeIfNecessary(args);
      case REBASE_IF_NECESSARY:
        return new RebaseIfNecessary(args);
      case REBASE_ALWAYS:
        return new RebaseAlways(args);
      case INHERIT:
      default:
        String errorMsg = "No submit strategy for: " + submitType;
        logger.atSevere().log("%s", errorMsg);
        throw new StorageException(errorMsg);
    }
  }
}