io.github.databob.FunktionaleGenerator.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of databob.kotlin Show documentation

Kill all builders!

The newest version!

package io.github.databob

import org.funktionale.either.Either
import org.funktionale.either.toLeft
import org.funktionale.either.toRight
import org.funktionale.option.Option
import org.funktionale.option.toOption
import java.lang.reflect.ParameterizedType
import java.lang.reflect.Type
import kotlin.reflect.full.defaultType
import kotlin.reflect.jvm.javaType

class FunktionaleGenerator : io.github.databob.Generator {

    private val lookup by lazy {
        mapOf, Databob) -> Any>(
            Option::class.defaultType.javaType to { t, d -> d.mk(Class.forName(t[0].typeName).kotlin).toOption().filter { d.mk().toss() } },
            Either::class.defaultType.javaType to { t, d ->
                val pair = Pair(d.mk(Class.forName(t[0].typeName).kotlin), d.mk(Class.forName(t[1].typeName).kotlin))
                if (d.mk().toss()) pair.toRight() else pair.toLeft()
            }
        )
    }

    override fun mk(type: Type, databob: Databob): Any? = when (type) {
        is ParameterizedType -> {
            lookup[type.rawType]?.invoke(type.actualTypeArguments, databob)
        }
        else -> null
    }
}