private Optional buildMessageForCodeOwnerApproval()

in java/com/google/gerrit/plugins/codeowners/backend/OnCodeOwnerApproval.java [109:230]
111 lines of code
17 McCabe index (conditional complexity)

  private Optional<String> buildMessageForCodeOwnerApproval(
      IdentifiedUser user,
      ChangeNotes changeNotes,
      PatchSet patchSet,
      Map<String, Short> oldApprovals,
      Map<String, Short> approvals,
      RequiredApproval requiredApproval,
      int limit) {
    LabelVote newVote = getNewVote(requiredApproval, approvals);

    // limit + 1, so that we can show an indicator if there are more than <limit> files.
    ImmutableList<Path> ownedPaths =
        OwnedChangedFile.getOwnedPaths(
            codeOwnerApprovalCheck.getOwnedPaths(
                changeNotes,
                changeNotes.getCurrentPatchSet(),
                user.getAccountId(),
                /* start= */ 0,
                limit + 1));

    if (ownedPaths.isEmpty()) {
      // the user doesn't own any of the modified paths
      return Optional.empty();
    }

    if (isIgnoredDueToSelfApproval(user, patchSet, requiredApproval)) {
      if (isCodeOwnerApprovalNewlyApplied(requiredApproval, oldApprovals, newVote)
          || isCodeOwnerApprovalUpOrDowngraded(requiredApproval, oldApprovals, newVote)) {
        return Optional.of(
            String.format(
                "The vote %s is ignored as code-owner approval since the label doesn't allow"
                    + " self approval of the patch set uploader.",
                newVote));
      }
      return Optional.empty();
    }

    boolean hasImplicitApprovalByUser =
        codeOwnersPluginConfiguration
                .getProjectConfig(changeNotes.getProjectName())
                .areImplicitApprovalsEnabled()
            && patchSet.uploader().equals(user.getAccountId());

    boolean noLongerExplicitlyApproved = false;
    StringBuilder message = new StringBuilder();
    if (isCodeOwnerApprovalNewlyApplied(requiredApproval, oldApprovals, newVote)) {
      if (hasImplicitApprovalByUser) {
        message.append(
            String.format(
                "By voting %s the following files are now explicitly code-owner approved by %s:\n",
                newVote, AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
      } else {
        message.append(
            String.format(
                "By voting %s the following files are now code-owner approved by %s:\n",
                newVote, AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
      }
    } else if (isCodeOwnerApprovalRemoved(requiredApproval, oldApprovals, newVote)) {
      if (newVote.value() == 0) {
        if (hasImplicitApprovalByUser) {
          noLongerExplicitlyApproved = true;
          message.append(
              String.format(
                  "By removing the %s vote the following files are no longer explicitly code-owner"
                      + " approved by %s:\n",
                  newVote.label(), AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
        } else {
          message.append(
              String.format(
                  "By removing the %s vote the following files are no longer code-owner approved"
                      + " by %s:\n",
                  newVote.label(), AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
        }
      } else {
        if (hasImplicitApprovalByUser) {
          noLongerExplicitlyApproved = true;
          message.append(
              String.format(
                  "By voting %s the following files are no longer explicitly code-owner approved by"
                      + " %s:\n",
                  newVote, AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
        } else {
          message.append(
              String.format(
                  "By voting %s the following files are no longer code-owner approved by %s:\n",
                  newVote, AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
        }
      }
    } else if (isCodeOwnerApprovalUpOrDowngraded(requiredApproval, oldApprovals, newVote)) {
      if (hasImplicitApprovalByUser) {
        message.append(
            String.format(
                "By voting %s the following files are still explicitly code-owner approved by"
                    + " %s:\n",
                newVote, AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
      } else {
        message.append(
            String.format(
                "By voting %s the following files are still code-owner approved by %s:\n",
                newVote, AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
      }
    } else {
      // non-approval was downgraded (e.g. -1 to -2)
      return Optional.empty();
    }

    if (ownedPaths.size() <= limit) {
      appendPaths(message, ownedPaths.stream());
    } else {
      appendPaths(message, ownedPaths.stream().limit(limit));
      message.append("(more files)\n");
    }

    if (hasImplicitApprovalByUser && noLongerExplicitlyApproved) {
      message.append(
          String.format(
              "\nThe listed files are still implicitly approved by %s.\n",
              AccountTemplateUtil.getAccountTemplate(user.getAccountId())));
    }

    return Optional.of(message.toString());
  }