private String getBaseChangeId()

in src/main/java/com/googlesource/gerrit/plugins/automerger/DownstreamCreator.java [539:561]

• 21 lines of code
• 6 McCabe index (conditional complexity)

  private String getBaseChangeId(List<String> parents, String branch)
      throws InvalidQueryParameterException, RestApiException {
    if (parents.isEmpty()) {
      log.info("No base change id for change with no parents.");
      return null;
    }
    // 1) Get topic of first parent
    String firstParentTopic = getTopic(parents.get(0));
    if (firstParentTopic == null) {
      return null;
    }
    // 2) query that topic and use that to find A'
    List<ChangeInfo> changesInTopic = getChangesInTopicAndBranch(firstParentTopic, branch);
    String firstParent = parents.get(0);
    for (ChangeInfo change : changesInTopic) {
      List<CommitInfo> topicChangeParents =
          change.revisions.get(change.currentRevision).commit.parents;
      if (topicChangeParents.size() > 1 && topicChangeParents.get(1).commit.equals(firstParent)) {
        return String.valueOf(change._number);
      }
    }
    return null;
  }