Line data    Source code

       1             : // Copyright (C) 2012 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.submit;
      16             : 
      17             : import com.google.common.collect.ImmutableList;
      18             : import com.google.gerrit.server.git.CodeReviewCommit;
      19             : import java.util.Collection;
      20             : import java.util.List;
      21             : 
      22             : public class MergeIfNecessary extends SubmitStrategy {
      23             :   MergeIfNecessary(SubmitStrategy.Arguments args) {
      24          53 :     super(args);
      25          53 :   }
      26             : 
      27             :   @Override
      28             :   public ImmutableList<SubmitStrategyOp> buildOps(Collection<CodeReviewCommit> toMerge) {
      29          53 :     List<CodeReviewCommit> sorted = args.mergeUtil.reduceToMinimalMerge(args.mergeSorter, toMerge);
      30          53 :     ImmutableList.Builder<SubmitStrategyOp> ops =
      31          53 :         ImmutableList.builderWithExpectedSize(sorted.size());
      32             : 
      33          53 :     if (args.mergeTip.getInitialTip() == null
      34          53 :         || !args.subscriptionGraph.hasSubscription(args.destBranch)) {
      35          53 :       CodeReviewCommit firstFastForward =
      36          53 :           args.mergeUtil.getFirstFastForward(args.mergeTip.getInitialTip(), args.rw, sorted);
      37          53 :       if (firstFastForward != null && !firstFastForward.equals(args.mergeTip.getInitialTip())) {
      38          53 :         ops.add(new FastForwardOp(args, firstFastForward));
      39             :       }
      40             :     }
      41             : 
      42             :     // For every other commit do a pair-wise merge.
      43          53 :     while (!sorted.isEmpty()) {
      44          15 :       CodeReviewCommit n = sorted.remove(0);
      45          15 :       ops.add(new MergeOneOp(args, n));
      46          15 :     }
      47          53 :     return ops.build();
      48             :   }
      49             : 
      50             :   static boolean dryRun(
      51             :       SubmitDryRun.Arguments args, CodeReviewCommit mergeTip, CodeReviewCommit toMerge) {
      52          21 :     return args.mergeUtil.canFastForward(args.mergeSorter, mergeTip, args.rw, toMerge)
      53          21 :         || args.mergeUtil.canMerge(args.mergeSorter, args.repo, mergeTip, toMerge);
      54             :   }
      55             : }