private ValidationResult validateRetentionValue()

in src/main/java/com/google/gcs/sdrs/controller/RetentionRulesController.java [284:332]
49 lines of code
10 McCabe index (conditional complexity)

  private ValidationResult validateRetentionValue(String retentionUnit, Integer retentionPeriod) {
    Collection<String> messages = new HashSet<>();
    if (retentionPeriod == null) {
      messages.add("retentionPeriod must be provided");
    } else {
      if (retentionPeriod < 0) {
        messages.add("retentionPeriod must be at least 0");
      }
      RetentionUnitType type = RetentionUnitType.getType(retentionUnit);
      if (type == null) {
        messages.add(
            String.format(
                "retentionPeriodUnit must be provided and is one of [%s, %s, %s]",
                RetentionUnitType.DAY.toString(),
                RetentionUnitType.MONTH.toString(),
                RetentionUnitType.VERSION.toString()));
      } else {
        switch (type) {
          case DAY:
            if (retentionPeriod > ValidationConstants.RETENTION_MAX_VALUE_DAY) {
              messages.add(
                  String.format(
                      "retentionPeriod exceeds maximum value of retentionPeriodUnit %s of %d",
                      RetentionUnitType.DAY.toString(), ValidationConstants.RETENTION_MAX_VALUE_DAY));
            }
            break;
          case MONTH:
            if (retentionPeriod > ValidationConstants.RETENTION_MAX_VALUE_MONTH) {
              messages.add(
                  String.format(
                      "retentionPeriod exceeds maximum value of retentionPeriodUnit %s of %d",
                      RetentionUnitType.MONTH.toString(), ValidationConstants.RETENTION_MAX_VALUE_MONTH));
            }
            break;
          case VERSION:
            if (retentionPeriod > ValidationConstants.RETENTION_MAX_VALUE_VERSION) {
              messages.add(
                  String.format(
                      "retentionPeriod exceeds maximum value of retentionPeriodUnit %s of %d",
                      RetentionUnitType.VERSION.toString(), ValidationConstants.RETENTION_MAX_VALUE_VERSION));
            }
            break;
          default:
            break;
        }
      }
    }
    return new ValidationResult(messages);
  }