New custom ColumnType, why only StringColumnType is Open

[chmuche]

Follow your advice inside the #148

I don't understand why StringColumnType is Open but not DateColumnType or the other.

My goal is to add validity constraint before the insert/update.

Like the Jsr303

For the Date I want to add before: LocalDate, after:LocalDate, defaultValue:LocalDate

And I don't want to copy past all the code inside DateColumnType

I think to exentends IColumnType and add a DateColumnType inside MyCustomDateColumnType

[Tapac]

I think to exentends IColumnType and add a DateColumnType inside MyCustomDateColumnType

That's a right way! Try to use kotlin delegation (https://kotlinlang.org/docs/reference/delegation.html)

class ValidatedDateTime(val before: LocalDate, val after: LocalDate, val defaultValue: LocalDate,
                        private val timeColType: DateColumnType = DateColumnType(true)) : IColumnType by timeColType {
    override fun valueToDB(value: Any?): Any? {
        assert(value != null) // Your validation here
        return timeColType.valueToDB(value)
    }
}

[chmuche]

Ok, it's exactly the code I write. But why StringColumnType is open ?
It's just to know you made this choice.
Any way thanks for the quick answer.

[Tapac]

But why StringColumnType is open ?

StringColumnType has two inheritors in Exposed code, so it was easier to make it open instead of using delegates.