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68 changes: 36 additions & 32 deletions
68
...ivr-engine-server/src/main/kotlin/org/vitrivr/engine/server/api/rest/KotlinxJsonMapper.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,51 +1,55 @@ | ||
| package org.vitrivr.engine.server.api.rest | ||
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| import com.fasterxml.jackson.core.type.TypeReference | ||
| import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper | ||
| import io.javalin.json.JsonMapper | ||
| import kotlinx.serialization.KSerializer | ||
| import kotlinx.serialization.SerializationException | ||
| import kotlinx.serialization.* | ||
| import kotlinx.serialization.json.Json | ||
| import kotlinx.serialization.modules.SerializersModule | ||
| import kotlinx.serialization.serializer | ||
| import org.vitrivr.engine.core.features.metadata.source.exif.logger | ||
| import kotlin.reflect.KType | ||
| import java.lang.reflect.ParameterizedType | ||
| import java.lang.reflect.Type | ||
| import kotlin.reflect.KTypeProjection | ||
| import kotlin.reflect.full.createType | ||
|
|
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| object KotlinxJsonMapper : JsonMapper { | ||
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| private val fallbackMapper = jacksonObjectMapper() | ||
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| override fun <T : Any> fromJsonString(json: String, targetType: Type): T { | ||
| private val json = Json { | ||
| serializersModule = SerializersModule { } | ||
| isLenient = true | ||
| ignoreUnknownKeys = true | ||
| } | ||
|
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| override fun <T : Any> fromJsonString(jsonString: String, targetType: Type): T { | ||
| return try { | ||
| @Suppress("UNCHECKED_CAST") | ||
| val serializer = serializer(targetType) as KSerializer<T> | ||
| Json.decodeFromString(serializer, json) | ||
| val kType : KType = targetType.toKType() | ||
| val serializer = json.serializersModule.serializer(kType) | ||
| json.decodeFromString(serializer, jsonString) as T | ||
| } catch (e: SerializationException) { | ||
| "Error while deserializing JSON: ${e.message}".let { | ||
| logger.error { it } | ||
| throw Exception(it) | ||
| } | ||
| null | ||
| throw Exception("Error while deserializing JSON: ${e.message}") | ||
| } catch (e: IllegalStateException) { | ||
| "Error state: ${e.message}".let { | ||
| logger.error { it } | ||
| throw Exception(it) | ||
| } | ||
| null | ||
| } ?: fallbackMapper.readValue(json, fallbackMapper.typeFactory.constructType(targetType)) | ||
|
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| throw Exception("Error state: ${e.message}") | ||
| } | ||
| } | ||
|
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| override fun toJsonString(obj: Any, type: Type): String { | ||
|
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| return try { | ||
| val serializer = serializer(type) | ||
| Json.encodeToString(serializer, obj) | ||
| val kType = type.toKType() | ||
| val serializer = json.serializersModule.serializer(kType) | ||
| json.encodeToString(serializer, obj) | ||
| } catch (e: SerializationException) { | ||
| null | ||
| throw Exception("Error while serializing JSON: ${e.message}") | ||
| } catch (e: IllegalStateException) { | ||
| null | ||
| } ?: fallbackMapper.writeValueAsString(obj) | ||
| throw Exception("Error state: ${e.message}") | ||
| } | ||
| } | ||
|
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| private fun Type.toKType(): KType { | ||
| return when (this) { | ||
| is ParameterizedType -> { | ||
| val rawType = (this.rawType as Class<*>).kotlin | ||
| val args = this.actualTypeArguments.map { it.toKType() } | ||
| rawType.createType(args.map { KTypeProjection.invariant(it) }) | ||
| } | ||
| is Class<*> -> this.kotlin.createType() | ||
| else -> throw IllegalArgumentException("Unsupported Type: $this") | ||
| } | ||
| } | ||
| } | ||
| } |