I'm writing a DAO in Kotlin. I would like to, and ...
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supaham
08/26/2017, 6:39 PMI'm writing a DAO in Kotlin. I would like to, and believe it to be acceptable, throw an error if they try to read a value that isn't set. lateinit does the trick, but not for fields that are nullable. Any suggestions without actually writing exception throwing for each field
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karelpeeters
08/26/2017, 7:02 PMYou could write a delegate for it: https://kotlinlang.org/docs/reference/delegated-properties.html
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supaham
08/29/2017, 2:12 AMI don't think this is an option. Kotlin doesn't seem to like delegate properties where getValue returns nullable
supaham
08/29/2017, 2:17 AMNevermind, it can work. However the field must be nullable as well as getValue return value. A workaround is to create two implementations a
OptionalPresenceOptionalNullablePresencesupaham
08/29/2017, 2:30 AMDelegation isnt an option for me. I need to find out whether a field is present or not. Delegate properties don't offer the ability to access the delegate class's members. The alternative solution is to try-catch every get operation, but that sounds terrible. I'll stick to an java Optional style implementation
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