ImmutableList validateProjectLevelConfig()

in java/com/google/gerrit/plugins/codeowners/backend/config/BackendConfig.java [106:168]
57 lines of code
10 McCabe index (conditional complexity)

  ImmutableList<CommitValidationMessage> validateProjectLevelConfig(
      String fileName, Config projectLevelConfig) {
    requireNonNull(fileName, "fileName");
    requireNonNull(projectLevelConfig, "projectLevelConfig");

    ImmutableList.Builder<CommitValidationMessage> validationMessages = ImmutableList.builder();

    String backendName = projectLevelConfig.getString(SECTION_CODE_OWNERS, null, KEY_BACKEND);
    if (backendName != null) {
      if (!lookupBackend(backendName).isPresent()) {
        validationMessages.add(
            new CommitValidationMessage(
                String.format(
                    "Code owner backend '%s' that is configured in %s (parameter %s.%s) not found.",
                    backendName, fileName, SECTION_CODE_OWNERS, KEY_BACKEND),
                ValidationMessage.Type.ERROR));
      }
    }

    String pathExpressionsName =
        projectLevelConfig.getString(SECTION_CODE_OWNERS, null, KEY_PATH_EXPRESSIONS);
    if (!Strings.isNullOrEmpty(pathExpressionsName)
        && !PathExpressions.tryParse(pathExpressionsName).isPresent()) {
      validationMessages.add(
          new CommitValidationMessage(
              String.format(
                  "Path expressions '%s' that are configured in %s (parameter %s.%s) not found.",
                  pathExpressionsName, fileName, SECTION_CODE_OWNERS, KEY_PATH_EXPRESSIONS),
              ValidationMessage.Type.ERROR));
    }

    for (String subsection : projectLevelConfig.getSubsections(SECTION_CODE_OWNERS)) {
      backendName = projectLevelConfig.getString(SECTION_CODE_OWNERS, subsection, KEY_BACKEND);
      if (backendName != null) {
        if (!lookupBackend(backendName).isPresent()) {
          validationMessages.add(
              new CommitValidationMessage(
                  String.format(
                      "Code owner backend '%s' that is configured in %s (parameter %s.%s.%s) not found.",
                      backendName, fileName, SECTION_CODE_OWNERS, subsection, KEY_BACKEND),
                  ValidationMessage.Type.ERROR));
        }
      }

      pathExpressionsName =
          projectLevelConfig.getString(SECTION_CODE_OWNERS, subsection, KEY_PATH_EXPRESSIONS);
      if (!Strings.isNullOrEmpty(pathExpressionsName)
          && !PathExpressions.tryParse(pathExpressionsName).isPresent()) {
        validationMessages.add(
            new CommitValidationMessage(
                String.format(
                    "Path expressions '%s' that are configured in %s (parameter %s.%s.%s) not found.",
                    pathExpressionsName,
                    fileName,
                    SECTION_CODE_OWNERS,
                    subsection,
                    KEY_PATH_EXPRESSIONS),
                ValidationMessage.Type.ERROR));
      }
    }

    return validationMessages.build();
  }