Exposed delegate for Bukkit ItemStack

Item.kt

import br.com.devsrsouza.kotlinbukkitapi.server.extensions.itemFromByteArray
import br.com.devsrsouza.kotlinbukkitapi.server.extensions.toByteArray
import org.bukkit.inventory.ItemStack
import org.jetbrains.exposed.dao.Entity
import org.jetbrains.exposed.sql.Column
import java.sql.Blob
import javax.sql.rowset.serial.SerialBlob
import kotlin.reflect.KProperty

fun Entity<*>.itemStack(column: Column<Blob>) = ItemStackExposedDelegate(column)
fun Entity<*>.itemStack(column: Column<Blob?>) = ItemStackExposedDelegateNullable(column)

class ItemStackExposedDelegate(
        val column: Column<Blob>
) : ExposedDelegate<ItemStack> {
    override operator fun <ID : Comparable<ID>> getValue(
            entity: Entity<ID>,
            desc: KProperty<*>
    ): ItemStack {
        val blob = entity.run { column.getValue(this, desc) }
        val byteArray = blob.getBytes(1, blob.length().toInt())
        return itemFromByteArray(byteArray)
    }

    override operator fun <ID : Comparable<ID>> setValue(
            entity: Entity<ID>,
            desc: KProperty<*>,
            value: ItemStack
    ) {
        val byteArray = value.toByteArray()
        val blob = SerialBlob(byteArray)
        entity.apply { column.setValue(this, desc, blob) }
    }
}

class ItemStackExposedDelegateNullable(
        val column: Column<Blob?>
) : ExposedDelegate<ItemStack?> {
     override operator fun <ID : Comparable<ID>> getValue(
             entity: Entity<ID>,
             desc: KProperty<*>
     ): ItemStack? {
        val blob = entity.run { column.getValue(this, desc) }
        val byteArray = blob?.getBytes(1, blob.length().toInt())
        return byteArray?.let { itemFromByteArray(it) }
    }

    override operator fun <ID : Comparable<ID>> setValue(
            entity: Entity<ID>,
            desc: KProperty<*>,
            value: ItemStack?
    ) {
        val byteArray = value?.toByteArray()
        val blob = byteArray?.let { SerialBlob(it) }
        entity.apply { column.setValue(this, desc, blob) }
    }
}