oib - groovy

class CustomValidators {
  static OIB_VALIDATOR = { String value ->
    if (!(value =~ /^[0-9]{11}$/)) {
      return false
    }

    Integer a = 10;
    10.times {
      a += (value[it] as Integer)
      a %= 10
      a = (a == 0 ? 10 : a)
      a *= 2
      a %= 11
    }

    def checkDigit = 11 - a
    checkDigit = (checkDigit == 10 ? 0 : checkDigit)

    return checkDigit == (value[-1] as Integer)
  }
}