PaperParcel SortedSet and SortedMap adapters

ParcelSortedMapAdapter.kt

class ParcelSortedMapAdapter<K, V>(
    private val keyAdapter: TypeAdapter<K>,
    private val valueAdapter: TypeAdapter<V>
) : TypeAdapter<@JvmSuppressWildcards SortedMap<K, V>> {

    override fun readFromParcel(source: Parcel): SortedMap<K, V> {
        val size = source.readInt()
        val map = TreeMap<K, V>()
        for (ignored in 1..size) {
            val key = keyAdapter.readFromParcel(source)
            val value = valueAdapter.readFromParcel(source)
            map.put(key, value)
        }
        return map
    }

    override fun writeToParcel(source: SortedMap<K, V>, dest: Parcel, flags: Int) {
        dest.writeInt(source.size)
        source.entries.forEach { entry ->
            keyAdapter.writeToParcel(entry.key, dest, flags)
            valueAdapter.writeToParcel(entry.value, dest, flags)
        }
    }
}

ParcelSortedSetAdapter.kt

class ParcelSortedSetAdapter<T>(
        private val itemAdapter: TypeAdapter<T>
) : TypeAdapter<@JvmSuppressWildcards SortedSet<T>> {

    override fun readFromParcel(source: Parcel): SortedSet<T> {
        val size = source.readInt()
        val list = TreeSet<T>()
        for (i in 0..size - 1) list.add(itemAdapter.readFromParcel(source))
        return list
    }

    override fun writeToParcel(source: SortedSet<T>, dest: Parcel, flags: Int) {
        dest.writeInt(source.size)
        source.forEach { element -> itemAdapter.writeToParcel(element, dest, flags) }
    }
}