add project typed serializer

CHANGELOG.md

@@ -4,6 +4,9 @@
 
 * `Versions`:
     * `Kotlin Exposed`: `0.30.1` -> `0.30.2`
+* `Serialization`:
+    * `TypedSerializer`:
+        * Project has been inited
 
 ## 0.4.34
 

serialization/typed_serializer/build.gradle

@@ -0,0 +1,7 @@
+plugins {
+    id "org.jetbrains.kotlin.multiplatform"
+    id "org.jetbrains.kotlin.plugin.serialization"
+    id "com.android.library"
+}
+
+apply from: "$mppProjectWithSerializationPresetPath"

serialization/typed_serializer/src/commonMain/kotlin/dev/inmo/micro_utils/serialization/typed_serializer/TypedSerializer.kt

@@ -0,0 +1,76 @@
+package dev.inmo.micro_utils.serialization.typed_serializer
+
+import kotlinx.serialization.*
+import kotlinx.serialization.builtins.serializer
+import kotlinx.serialization.descriptors.*
+import kotlinx.serialization.encoding.*
+import kotlin.reflect.KClass
+
+class TypedSerializer<T : Any>(
+    kClass: KClass<T>,
+    presetSerializers: Map<String, KSerializer<out T>> = emptyMap()
+) : KSerializer<T> {
+    private val serializers = presetSerializers.toMutableMap()
+    @InternalSerializationApi
+    override val descriptor: SerialDescriptor = buildSerialDescriptor(
+        "TextSourceSerializer",
+        SerialKind.CONTEXTUAL
+    ) {
+        element("type", String.serializer().descriptor)
+        element("value", ContextualSerializer(kClass).descriptor)
+    }
+
+    @InternalSerializationApi
+    override fun deserialize(decoder: Decoder): T {
+        return decoder.decodeStructure(descriptor) {
+            var type: String? = null
+            lateinit var result: T
+            while (true) {
+                when (val index = decodeElementIndex(descriptor)) {
+                    0 -> type = decodeStringElement(descriptor, 0)
+                    1 -> {
+                        require(type != null) { "Type is null, but it is expected that was inited already" }
+                        result = decodeSerializableElement(
+                            descriptor,
+                            1,
+                            serializers.getValue(type)
+                        )
+                    }
+                    CompositeDecoder.DECODE_DONE -> break
+                    else -> error("Unexpected index: $index")
+                }
+            }
+            result
+        }
+    }
+
+    @InternalSerializationApi
+    private fun <O: T> CompositeEncoder.encode(value: O) {
+        encodeSerializableElement(descriptor, 1, value::class.serializer() as KSerializer<O>, value)
+    }
+
+    @InternalSerializationApi
+    override fun serialize(encoder: Encoder, value: T) {
+        encoder.encodeStructure(descriptor) {
+            val valueSerializer = value::class.serializer()
+            val type = serializers.keys.first { serializers[it] == valueSerializer }
+            encodeStringElement(descriptor, 0, type)
+            encode(value)
+        }
+    }
+
+
+    fun <O: T> include(type: String, serializer: KSerializer<O>) {
+        require(type !in serializers.keys)
+        serializers[type] = serializer
+    }
+
+    fun exclude(type: String) {
+        require(type !in serializers.keys)
+        serializers.remove(type)
+    }
+}
+
+inline fun <reified T : Any> TypedSerializer(
+    presetSerializers: Map<String, KSerializer<out T>> = emptyMap()
+) = TypedSerializer(T::class, presetSerializers)

serialization/typed_serializer/src/commonTest/kotlin/dev/inmo/micro_utils/serialization/typed_serializer/TypedSerializerTests.kt

@@ -0,0 +1,40 @@
+package dev.inmo.micro_utils.serialization.typed_serializer
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.json.Json
+import kotlin.random.Random
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class TypedSerializerTests {
+    interface Example {
+        val number: Number
+    }
+    val serialFormat = Json {  }
+
+    @Serializable
+    data class Example1(override val number: Long) : Example
+
+    @Serializable
+    data class Example2(override val number: Double) : Example
+
+    @Test
+    fun testThatSerializerWorksCorrectly() {
+        val serializer = TypedSerializer(
+            mapOf(
+                "long" to Example1.serializer(),
+                "double" to Example2.serializer()
+            )
+        )
+
+        val value1 = Example1(Random.nextLong())
+        val value2 = Example2(Random.nextDouble())
+
+        val list = listOf(value1, value2)
+        val serialized = serialFormat.encodeToString(ListSerializer(serializer), list)
+        val deserialized = serialFormat.decodeFromString(ListSerializer(serializer), serialized)
+
+        assertEquals(list, deserialized)
+    }
+}

serialization/typed_serializer/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest package="dev.inmo.micro_utils.serialization.typed_serializer"/>

settings.gradle

@@ -26,6 +26,7 @@ String[] includes = [
     ":android:alerts:recyclerview",
     ":serialization:base64",
     ":serialization:encapsulator",
+    ":serialization:typed_serializer",
 
     ":dokka"
 ]