private Result computeRevisionByCheckoutRules()

in git-server/src/main/java/jetbrains/buildServer/buildTriggers/vcs/git/GitCollectChangesPolicy.java [333:394]
55 lines of code
13 McCabe index (conditional complexity)

  private Result computeRevisionByCheckoutRules(@NotNull String startRevision,
                                                @NotNull Collection<String> stopRevisions,
                                                @NotNull CheckoutRules rules,
                                                @Nullable Set<String> visited,
                                                @NotNull OperationContext context,
                                                @NotNull GitVcsRoot gitRoot) throws VcsException {
    if (!stopRevisions.isEmpty() &&
        myVcs.isNativeGitOperationEnabled(gitRoot) &&
        rules.getExcludeRules().isEmpty() &&
        TeamCityProperties.getBooleanOrTrue(REVISION_BY_CHECKOUT_RULES_USE_LOG_COMMAND)) {

      // this revWalk helps us to compute reachable stop revisions, we do not need to apply checkout rules as we already checked that
      // there are no interesting commits between start and stop revisions
      CheckoutRulesRevWalk revWalk = new CheckoutRulesRevWalk(myConfig, context, rules) {
        @Override
        protected boolean isCurrentCommitIncluded() {
          return false;
        }
      };

      try {
        Boolean hasInterestingCommits = null;
        Collection<String> paths = new HashSet<>();
        try {
          for (IncludeRule r: rules.getIncludeRules()) {
            paths.add(r.getFrom());
          }
          Set<String> stopRevisionsParents = getParentsOfStopRevisions(stopRevisions, context, revWalk);
          if (!stopRevisionsParents.isEmpty()) {
            hasInterestingCommits = hasCommitsAffectingPaths(startRevision, stopRevisionsParents, paths, context, gitRoot);
          }
        } catch (Exception e) {
          LOG.warnAndDebugDetails("Could not compute changed paths from: " + startRevision + " with stop revisions: " + stopRevisions + " in VCS root: " + gitRoot.toString(), e);
        }

        if (hasInterestingCommits != null && !hasInterestingCommits) {
          try {
            // only traverse DAG to compute visited and reachable stop revisions without checking the checkout rules
            return computeResult(startRevision, stopRevisions, visited, gitRoot, revWalk);
          } catch (Exception e) {
            throw context.wrapException(e);
          }
        }
      } finally {
        revWalk.close();
        revWalk.dispose();
      }
    }

    CheckoutRulesRevWalk revWalk = null;
    try {
      revWalk = new CheckoutRulesRevWalk(myConfig, context, rules);
      return computeResult(startRevision, stopRevisions, visited, gitRoot, revWalk);
    } catch (Exception e) {
      throw context.wrapException(e);
    } finally {
      if (revWalk != null) {
        revWalk.close();
        revWalk.dispose();
      }
    }
  }