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Simplify customization of bson-kotlinx #1293

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merged 2 commits into from
Jan 24, 2024
Merged

Simplify customization of bson-kotlinx #1293

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f9e3673
Simplify customization of bson-kotlinx
rozza Jan 10, 2024
74e9716
Added decode to test
rozza Jan 24, 2024
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10 changes: 8 additions & 2 deletions bson-kotlinx/src/main/kotlin/org/bson/codecs/kotlinx/KotlinSerializerCodecProvider.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@
*/
package org.bson.codecs.kotlinx

import kotlinx.serialization.ExperimentalSerializationApi
import kotlinx.serialization.modules.SerializersModule
import org.bson.codecs.Codec
import org.bson.codecs.configuration.CodecProvider
import org.bson.codecs.configuration.CodecRegistry
Expand All @@ -24,8 +26,12 @@ import org.bson.codecs.configuration.CodecRegistry
*
* The underlying class must be annotated with the `@Serializable`.
*/
public class KotlinSerializerCodecProvider : CodecProvider {
@OptIn(ExperimentalSerializationApi::class)
public class KotlinSerializerCodecProvider(
private val serializersModule: SerializersModule = defaultSerializersModule,
private val bsonConfiguration: BsonConfiguration = BsonConfiguration()
) : CodecProvider {

override fun <T : Any> get(clazz: Class<T>, registry: CodecRegistry): Codec<T>? =
KotlinSerializerCodec.create(clazz.kotlin)
KotlinSerializerCodec.create(clazz.kotlin, serializersModule, bsonConfiguration)
}
42 changes: 42 additions & 0 deletions bson-kotlinx/src/test/kotlin/org/bson/codecs/kotlinx/KotlinSerializerCodecProviderTest.kt
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Expand Up @@ -20,6 +20,18 @@ import kotlin.test.assertEquals
import kotlin.test.assertNotNull
import kotlin.test.assertNull
import kotlin.test.assertTrue
import kotlinx.serialization.ExperimentalSerializationApi
import kotlinx.serialization.modules.SerializersModule
import kotlinx.serialization.modules.plus
import kotlinx.serialization.modules.polymorphic
import kotlinx.serialization.modules.subclass
import org.bson.BsonDocument
import org.bson.BsonDocumentWriter
import org.bson.codecs.EncoderContext
import org.bson.codecs.kotlinx.samples.DataClassContainsOpen
import org.bson.codecs.kotlinx.samples.DataClassOpen
import org.bson.codecs.kotlinx.samples.DataClassOpenA
import org.bson.codecs.kotlinx.samples.DataClassOpenB
import org.bson.codecs.kotlinx.samples.DataClassParameterized
import org.bson.codecs.kotlinx.samples.DataClassWithSimpleValues
import org.bson.conversions.Bson
Expand Down Expand Up @@ -60,4 +72,34 @@ class KotlinSerializerCodecProviderTest {
assertTrue { codec is KotlinSerializerCodec }
assertEquals(DataClassWithSimpleValues::class.java, codec.encoderClass)
}

@OptIn(ExperimentalSerializationApi::class)
@Test
fun shouldAllowOverridingOfSerializersModuleAndBsonConfigurationInConstructor() {

val serializersModule =
SerializersModule {
this.polymorphic(DataClassOpen::class) {
this.subclass(DataClassOpenA::class)
this.subclass(DataClassOpenB::class)
}
} + defaultSerializersModule

val bsonConfiguration = BsonConfiguration(classDiscriminator = "__type")
val dataClassContainsOpenB = DataClassContainsOpen(DataClassOpenB(1))

val codec =
KotlinSerializerCodecProvider(serializersModule, bsonConfiguration)
.get(DataClassContainsOpen::class.java, Bson.DEFAULT_CODEC_REGISTRY)!!

assertTrue { codec is KotlinSerializerCodec }
val encodedDocument = BsonDocument()
val writer = BsonDocumentWriter(encodedDocument)
codec.encode(writer, dataClassContainsOpenB, EncoderContext.builder().build())
writer.flush()

assertEquals(
BsonDocument.parse("""{"open": {"__type": "org.bson.codecs.kotlinx.samples.DataClassOpenB", "b": 1}}"""),
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[optional]
We may also test that decoding this BSON succeeds and produces an object equal to dataClassContainsOpenB. This way we'll know that the custom classDiscriminator is used not only by the encoder, but also by the decoder.

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Done

encodedDocument)
}
}