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/*
* Copyright 2018 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kotlinx.serialization.internal
import kotlinx.serialization.*
import kotlinx.serialization.CompositeDecoder.Companion.READ_ALL
import kotlinx.serialization.CompositeDecoder.Companion.READ_DONE
import kotlin.reflect.KClass
sealed class AbstractCollectionSerializer<TElement, TCollection, TBuilder>: KSerializer<TCollection> {
abstract fun TCollection.objSize(): Int
abstract fun TCollection.objIterator(): Iterator<TElement>
abstract fun builder(): TBuilder
abstract fun TBuilder.builderSize(): Int
abstract fun TBuilder.toResult(): TCollection
abstract fun TCollection.toBuilder(): TBuilder
abstract fun TBuilder.checkCapacity(size: Int)
abstract val typeParams: Array<KSerializer<*>>
abstract override fun serialize(encoder: Encoder, obj: TCollection)
final override fun patch(decoder: Decoder, old: TCollection): TCollection {
val builder = old.toBuilder()
val startIndex = builder.builderSize()
@Suppress("NAME_SHADOWING")
val decoder = decoder.beginStructure(descriptor, *typeParams)
val size = readSize(decoder, builder)
mainLoop@ while (true) {
val index = decoder.decodeElementIndex(descriptor)
when (index) {
READ_ALL -> {
readAll(decoder, builder, startIndex, size)
break@mainLoop
}
READ_DONE -> break@mainLoop
else -> readItem(decoder, startIndex + index, builder)
}
}
decoder.endStructure(descriptor)
return builder.toResult()
}
final override fun deserialize(decoder: Decoder): TCollection {
val builder = builder()
return patch(decoder, builder.toResult())
}
private fun readSize(decoder: CompositeDecoder, builder: TBuilder): Int {
val size = decoder.decodeCollectionSize(descriptor)
builder.checkCapacity(size)
return size
}
protected abstract fun readItem(decoder: CompositeDecoder, index: Int, builder: TBuilder, checkIndex: Boolean = true)
private fun readAll(decoder: CompositeDecoder, builder: TBuilder, startIndex: Int, size: Int) {
require(size >= 0) { "Size must be known in advance when using READ_ALL" }
for (index in 0 until size)
readItem(decoder, startIndex + index, builder, checkIndex = false)
}
}
sealed class ListLikeSerializer<TElement, TCollection, TBuilder>(val elementSerializer: KSerializer<TElement>) :
AbstractCollectionSerializer<TElement, TCollection, TBuilder>() {
abstract fun TBuilder.insert(index: Int, element: TElement)
abstract override val descriptor: ListLikeDescriptor
final override val typeParams: Array<KSerializer<*>> = arrayOf(elementSerializer)
override fun serialize(encoder: Encoder, obj: TCollection) {
val size = obj.objSize()
@Suppress("NAME_SHADOWING")
val encoder = encoder.beginCollection(descriptor, size, *typeParams)
val iterator = obj.objIterator()
for (index in 0 until size)
encoder.encodeSerializableElement(descriptor, index, elementSerializer, iterator.next())
encoder.endStructure(descriptor)
}
protected override fun readItem(decoder: CompositeDecoder, index: Int, builder: TBuilder, checkIndex: Boolean) {
builder.insert(index, decoder.decodeSerializableElement(descriptor, index, elementSerializer))
}
}
sealed class MapLikeSerializer<TKey, TVal, TCollection, TBuilder: MutableMap<TKey, TVal>>(
val keySerializer: KSerializer<TKey>,
val valueSerializer: KSerializer<TVal>
) : AbstractCollectionSerializer<Map.Entry<TKey, TVal>, TCollection, TBuilder>() {
abstract fun TBuilder.insertKeyValuePair(index: Int, key: TKey, value: TVal)
abstract override val descriptor: MapLikeDescriptor
final override val typeParams = arrayOf(keySerializer, valueSerializer)
final override fun readItem(decoder: CompositeDecoder, index: Int, builder: TBuilder, checkIndex: Boolean) {
val key: TKey = decoder.decodeSerializableElement(descriptor, index, keySerializer)
val vIndex = if (checkIndex) {
decoder.decodeElementIndex(descriptor).also {
require(it == index + 1) { "Value must follow key in a map, index for key: $index, returned index for value: $it" }
}
} else {
index + 1
}
val value: TVal = if (builder.containsKey(key) && valueSerializer.descriptor.kind !is PrimitiveKind) {
decoder.updateSerializableElement(descriptor, vIndex, valueSerializer, builder.getValue(key))
} else {
decoder.decodeSerializableElement(descriptor, vIndex, valueSerializer)
}
builder[key] = value
}
override fun serialize(encoder: Encoder, obj: TCollection) {
val size = obj.objSize()
@Suppress("NAME_SHADOWING")
val encoder = encoder.beginCollection(descriptor, size, *typeParams)
val iterator = obj.objIterator()
var index = 0
iterator.forEach { (k, v) ->
encoder.encodeSerializableElement(descriptor, index++, keySerializer, k)
encoder.encodeSerializableElement(descriptor, index++, valueSerializer, v)
}
encoder.endStructure(descriptor)
}
}
// todo: can be more efficient when array size is know in advance, this one always uses temporary ArrayList as builder
class ReferenceArraySerializer<T: Any, E: T?>(private val kClass: KClass<T>, eSerializer: KSerializer<E>):
ListLikeSerializer<E, Array<E>, ArrayList<E>>(eSerializer) {
override val descriptor = ArrayClassDesc(eSerializer.descriptor)
override fun Array<E>.objSize(): Int = size
override fun Array<E>.objIterator(): Iterator<E> = iterator()
override fun builder(): ArrayList<E> = arrayListOf()
override fun ArrayList<E>.builderSize(): Int = size
@Suppress("UNCHECKED_CAST")
override fun ArrayList<E>.toResult(): Array<E> = toNativeArray<T, E>(kClass)
override fun Array<E>.toBuilder(): ArrayList<E> = ArrayList(this.asList())
override fun ArrayList<E>.checkCapacity(size: Int) = ensureCapacity(size)
override fun ArrayList<E>.insert(index: Int, element: E) { add(index, element) }
}
class ArrayListSerializer<E>(element: KSerializer<E>) : ListLikeSerializer<E, List<E>, ArrayList<E>>(element) {
override val descriptor = ArrayListClassDesc(element.descriptor)
override fun List<E>.objSize(): Int = size
override fun List<E>.objIterator(): Iterator<E> = iterator()
override fun builder(): ArrayList<E> = arrayListOf()
override fun ArrayList<E>.builderSize(): Int = size
override fun ArrayList<E>.toResult(): List<E> = this
override fun List<E>.toBuilder(): ArrayList<E> = this as? ArrayList<E> ?: ArrayList(this)
override fun ArrayList<E>.checkCapacity(size: Int) = ensureCapacity(size)
override fun ArrayList<E>.insert(index: Int, element: E) { add(index, element) }
}
class LinkedHashSetSerializer<E>(eSerializer: KSerializer<E>) : ListLikeSerializer<E, Set<E>, LinkedHashSet<E>>(eSerializer) {
override val descriptor = LinkedHashSetClassDesc(eSerializer.descriptor)
override fun Set<E>.objSize(): Int = size
override fun Set<E>.objIterator(): Iterator<E> = iterator()
override fun builder(): LinkedHashSet<E> = linkedSetOf()
override fun LinkedHashSet<E>.builderSize(): Int = size
override fun LinkedHashSet<E>.toResult(): Set<E> = this
override fun Set<E>.toBuilder(): LinkedHashSet<E> = this as? LinkedHashSet<E> ?: LinkedHashSet(this)
override fun LinkedHashSet<E>.checkCapacity(size: Int) {}
override fun LinkedHashSet<E>.insert(index: Int, element: E) { add(element) }
}
class HashSetSerializer<E>(eSerializer: KSerializer<E>) : ListLikeSerializer<E, Set<E>, HashSet<E>>(eSerializer) {
override val descriptor = HashSetClassDesc(eSerializer.descriptor)
override fun Set<E>.objSize(): Int = size
override fun Set<E>.objIterator(): Iterator<E> = iterator()
override fun builder(): HashSet<E> = HashSet()
override fun HashSet<E>.builderSize(): Int = size
override fun HashSet<E>.toResult(): Set<E> = this
override fun Set<E>.toBuilder(): HashSet<E> = this as? HashSet<E> ?: HashSet(this)
override fun HashSet<E>.checkCapacity(size: Int) {}
override fun HashSet<E>.insert(index: Int, element: E) { add(element) }
}
class LinkedHashMapSerializer<K, V>(kSerializer: KSerializer<K>, vSerializer: KSerializer<V>) :
MapLikeSerializer<K, V, Map<K, V>, LinkedHashMap<K, V>>(kSerializer, vSerializer) {
override val descriptor = LinkedHashMapClassDesc(kSerializer.descriptor, vSerializer.descriptor)
override fun Map<K, V>.objSize(): Int = size
override fun Map<K, V>.objIterator(): Iterator<Map.Entry<K, V>> = iterator()
override fun builder(): LinkedHashMap<K, V> = LinkedHashMap()
override fun LinkedHashMap<K, V>.builderSize(): Int = size
override fun LinkedHashMap<K, V>.toResult(): Map<K, V> = this
override fun Map<K, V>.toBuilder(): LinkedHashMap<K, V> = this as? LinkedHashMap<K, V> ?: LinkedHashMap(this)
override fun LinkedHashMap<K, V>.checkCapacity(size: Int) {}
override fun LinkedHashMap<K, V>.insertKeyValuePair(index: Int, key: K, value: V) = set(key, value)
}
class HashMapSerializer<K, V>(kSerializer: KSerializer<K>, vSerializer: KSerializer<V>) :
MapLikeSerializer<K, V, Map<K, V>, HashMap<K, V>>(kSerializer, vSerializer) {
override val descriptor = HashMapClassDesc(kSerializer.descriptor, vSerializer.descriptor)
override fun Map<K, V>.objSize(): Int = size
override fun Map<K, V>.objIterator(): Iterator<Map.Entry<K, V>> = iterator()
override fun builder(): HashMap<K, V> = HashMap()
override fun HashMap<K, V>.builderSize(): Int = size
override fun HashMap<K, V>.toResult(): Map<K, V> = this
override fun Map<K, V>.toBuilder(): HashMap<K, V> = this as? HashMap<K, V> ?: HashMap(this)
override fun HashMap<K, V>.checkCapacity(size: Int) {}
override fun HashMap<K, V>.insertKeyValuePair(index: Int, key: K, value: V) = set(key, value)
}
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