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Added Bson-Kotlin Array Codec #1457
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128 changes: 128 additions & 0 deletions
128
bson-kotlin/src/main/kotlin/org/bson/codecs/kotlin/ArrayCodec.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| * Copyright 2008-present MongoDB, Inc. | ||
| * | ||
| * 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 org.bson.codecs.kotlin | ||
|
|
||
| import java.lang.reflect.ParameterizedType | ||
| import java.lang.reflect.Type | ||
| import kotlin.reflect.KClass | ||
| import org.bson.BsonReader | ||
| import org.bson.BsonType | ||
| import org.bson.BsonWriter | ||
| import org.bson.codecs.Codec | ||
| import org.bson.codecs.DecoderContext | ||
| import org.bson.codecs.EncoderContext | ||
| import org.bson.codecs.configuration.CodecRegistry | ||
|
|
||
| @Suppress("UNCHECKED_CAST") | ||
| internal data class ArrayCodec<R : Any, V>(private val kClass: KClass<R>, private val codec: Codec<V?>) : Codec<R> { | ||
|
|
||
| companion object { | ||
| internal fun <R : Any> create( | ||
| kClass: KClass<R>, | ||
| typeArguments: List<Type>, | ||
| codecRegistry: CodecRegistry | ||
| ): Codec<R> { | ||
| assert(kClass.javaObjectType.isArray) { "$kClass must be an array type" } | ||
| val (valueClass, nestedTypes) = | ||
| if (typeArguments.isEmpty()) { | ||
| Pair(kClass.java.componentType.kotlin.javaObjectType as Class<Any>, emptyList()) | ||
| } else { | ||
| // Unroll the actual class and any type arguments | ||
| when (val pType = typeArguments[0]) { | ||
| is Class<*> -> Pair(pType as Class<Any>, emptyList()) | ||
| is ParameterizedType -> Pair(pType.rawType as Class<Any>, pType.actualTypeArguments.toList()) | ||
| else -> Pair(Object::class.java as Class<Any>, emptyList()) | ||
| } | ||
| } | ||
| val codec = | ||
| if (nestedTypes.isEmpty()) codecRegistry.get(valueClass) else codecRegistry.get(valueClass, nestedTypes) | ||
| return ArrayCodec(kClass, codec) | ||
| } | ||
| } | ||
|
|
||
| private val isPrimitiveArray = kClass.java.componentType != kClass.java.componentType.kotlin.javaObjectType | ||
|
|
||
| override fun encode(writer: BsonWriter, arrayValue: R, encoderContext: EncoderContext) { | ||
| writer.writeStartArray() | ||
|
|
||
| boxed(arrayValue).forEach { | ||
| if (it == null) writer.writeNull() else encoderContext.encodeWithChildContext(codec, writer, it) | ||
| } | ||
|
|
||
| writer.writeEndArray() | ||
| } | ||
|
|
||
| override fun getEncoderClass(): Class<R> = kClass.java | ||
|
|
||
| override fun decode(reader: BsonReader, decoderContext: DecoderContext): R { | ||
| reader.readStartArray() | ||
| val data = ArrayList<V?>() | ||
| while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) { | ||
| if (reader.currentBsonType == BsonType.NULL) { | ||
| reader.readNull() | ||
| data.add(null) | ||
| } else { | ||
| data.add(decoderContext.decodeWithChildContext(codec, reader)) | ||
| } | ||
| } | ||
| reader.readEndArray() | ||
| return unboxed(data) | ||
| } | ||
|
|
||
| fun boxed(arrayValue: R): Iterable<V?> { | ||
| val boxedValue = | ||
| if (!isPrimitiveArray) { | ||
| (arrayValue as Array<V?>).asIterable() | ||
| } else if (arrayValue is BooleanArray) { | ||
| arrayValue.asIterable() | ||
| } else if (arrayValue is ByteArray) { | ||
| arrayValue.asIterable() | ||
| } else if (arrayValue is CharArray) { | ||
| arrayValue.asIterable() | ||
| } else if (arrayValue is DoubleArray) { | ||
| arrayValue.asIterable() | ||
| } else if (arrayValue is FloatArray) { | ||
| arrayValue.asIterable() | ||
| } else if (arrayValue is IntArray) { | ||
| arrayValue.asIterable() | ||
| } else if (arrayValue is LongArray) { | ||
| arrayValue.asIterable() | ||
| } else if (arrayValue is ShortArray) { | ||
| arrayValue.asIterable() | ||
| } else { | ||
| throw IllegalArgumentException("Unsupported array type ${arrayValue.javaClass}") | ||
| } | ||
| return boxedValue as Iterable<V?> | ||
| } | ||
|
|
||
| private fun unboxed(data: ArrayList<V?>): R { | ||
| return when (kClass) { | ||
| BooleanArray::class -> (data as ArrayList<Boolean>).toBooleanArray() as R | ||
| ByteArray::class -> (data as ArrayList<Byte>).toByteArray() as R | ||
| CharArray::class -> (data as ArrayList<Char>).toCharArray() as R | ||
| DoubleArray::class -> (data as ArrayList<Double>).toDoubleArray() as R | ||
| FloatArray::class -> (data as ArrayList<Float>).toFloatArray() as R | ||
| IntArray::class -> (data as ArrayList<Int>).toIntArray() as R | ||
| LongArray::class -> (data as ArrayList<Long>).toLongArray() as R | ||
| ShortArray::class -> (data as ArrayList<Short>).toShortArray() as R | ||
| else -> data.toArray(arrayOfNulls(data.size)) as R | ||
| } | ||
| } | ||
|
|
||
| private fun arrayOfNulls(size: Int): Array<V?> { | ||
| return java.lang.reflect.Array.newInstance(codec.encoderClass, size) as Array<V?> | ||
| } | ||
| } | ||
31 changes: 31 additions & 0 deletions
31
bson-kotlin/src/main/kotlin/org/bson/codecs/kotlin/ArrayCodecProvider.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| /* | ||
| * Copyright 2008-present MongoDB, Inc. | ||
| * | ||
| * 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 org.bson.codecs.kotlin | ||
|
|
||
| import java.lang.reflect.Type | ||
| import org.bson.codecs.Codec | ||
| import org.bson.codecs.configuration.CodecProvider | ||
| import org.bson.codecs.configuration.CodecRegistry | ||
|
|
||
| /** A Kotlin reflection based Codec Provider for data classes */ | ||
| public class ArrayCodecProvider : CodecProvider { | ||
| override fun <T : Any> get(clazz: Class<T>, registry: CodecRegistry): Codec<T>? = get(clazz, emptyList(), registry) | ||
|
|
||
| override fun <T : Any> get(clazz: Class<T>, typeArguments: List<Type>, registry: CodecRegistry): Codec<T>? = | ||
| if (clazz.isArray) { | ||
| ArrayCodec.create(clazz.kotlin, typeArguments, registry) | ||
| } else null | ||
| } |
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Just a question: Is it our Kotlin code style to use single-line if-else statements without braces?
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Yes, we follow the main kotlin coding standards.
See: https://kotlinlang.org/docs/control-flow.html#if-expression
It looks unusual as in Java we'd use a tenary operator but in Kotlin there is no such thing.