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object NegativeId extends Enumeration {
val Negative = Value(-1, "minus")
val Zero = Value(0, "zero")
val Positive = Value(1, "plus")
def fromInt(id: Int) = values find (_.id == id) match {
case Some(v) => v
case None => null
}
}
object Test extends App {
println(NegativeId.fromInt(-1))
println(NegativeId.fromInt(0))
println(NegativeId.fromInt(1))
}
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