sealed class serialisation refactored
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AdrianLxM
parent
fa538f059c
commit
60f51cfab9
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@ -1,71 +0,0 @@
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package info.nightscout.androidaps.utils
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import com.google.gson.Gson
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import com.google.gson.GsonBuilder
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import com.google.gson.TypeAdapter
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import com.google.gson.TypeAdapterFactory
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import com.google.gson.reflect.TypeToken
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import com.google.gson.stream.JsonReader
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import com.google.gson.stream.JsonWriter
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import info.nightscout.androidaps.database.entities.XXXValueWithUnit
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import kotlin.jvm.internal.Reflection
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import kotlin.reflect.KClass
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fun generateGson() = GsonBuilder().registerTypeAdapterFactory(
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object : TypeAdapterFactory {
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override fun <T : Any> create(gson: Gson, type: TypeToken<T>): TypeAdapter<T> {
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val kclass = Reflection.getOrCreateKotlinClass(type.rawType)
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return if (kclass.sealedSubclasses.any()) {
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SealedClassTypeAdapter<T>(kclass, gson)
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} else
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gson.getDelegateAdapter(this, type)
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}
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}).create()
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/*fun testSealedClass(): XXXValueWithUnit.SimpleString? {
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val gson = generateGson()
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val someValueWithUnit: Container = Container(XXXValueWithUnit.SimpleString("hello"))
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val serialised = gson.toJson(someValueWithUnit)
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val deserialised : Container = gson.fromJson(serialised, Container::class.java)
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return deserialised.c as? XXXValueWithUnit.SimpleString
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}*/
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fun toSealedClassJson(list: List<XXXValueWithUnit>): String =
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list.map { Container(it) }.let { generateGson().toJson(it) }
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fun fromJson(string: String) : List<XXXValueWithUnit> {
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val itemType = object : TypeToken<List<Container>>() {}.type
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return generateGson().fromJson<List<Container>>(string, itemType).map { it.wrapped }
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}
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data class Container(val wrapped: XXXValueWithUnit)
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class SealedClassTypeAdapter<T : Any>(private val kclass: KClass<Any>, val gson: Gson) : TypeAdapter<T>() {
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override fun read(jsonReader: JsonReader): T? {
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jsonReader.beginObject() //start reading the object
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val nextName = jsonReader.nextName() //get the name on the object
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val innerClass = kclass.sealedSubclasses.firstOrNull {
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it.simpleName!!.contains(nextName)
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}
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?: throw Exception("$nextName is not found to be a data class of the sealed class ${kclass.qualifiedName}")
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val x = gson.fromJson<T>(jsonReader, innerClass.javaObjectType)
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jsonReader.endObject()
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//if there a static object, actually return that back to ensure equality and such!
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return innerClass.objectInstance as T? ?: x
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}
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override fun write(out: JsonWriter, value: T) {
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val jsonString = gson.toJson(value)
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out.beginObject()
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val name = value.javaClass.canonicalName
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out.name(name.splitToSequence(".").last()).jsonValue(jsonString)
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out.endObject()
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}
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}
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@ -0,0 +1,50 @@
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package info.nightscout.androidaps.utils.serialisation
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import com.google.gson.Gson
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import com.google.gson.GsonBuilder
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import com.google.gson.TypeAdapter
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import com.google.gson.TypeAdapterFactory
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import com.google.gson.reflect.TypeToken
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import com.google.gson.stream.JsonReader
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import com.google.gson.stream.JsonWriter
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import kotlin.jvm.internal.Reflection
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import kotlin.reflect.KClass
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object SealedClassHelper {
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val gson: Gson = GsonBuilder().registerTypeAdapterFactory(
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object : TypeAdapterFactory {
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override fun <T : Any> create(gson: Gson, type: TypeToken<T>): TypeAdapter<T> {
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val kClass = Reflection.getOrCreateKotlinClass(type.rawType)
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return if (kClass.sealedSubclasses.any()) {
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SealedClassTypeAdapter<T>(kClass, gson)
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} else
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gson.getDelegateAdapter(this, type)
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}
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}).create()
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private class SealedClassTypeAdapter<T : Any>(private val kClass: KClass<Any>, val gson: Gson) : TypeAdapter<T>() {
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override fun read(jsonReader: JsonReader): T? {
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jsonReader.beginObject() //start reading the object
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val nextName = jsonReader.nextName() //get the name on the object
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val innerClass = kClass.sealedSubclasses.firstOrNull {
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it.simpleName!!.contains(nextName)
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}
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?: throw Exception("$nextName is not found to be a data class of the sealed class ${kClass.qualifiedName}")
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val x = gson.fromJson<T>(jsonReader, innerClass.javaObjectType)
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jsonReader.endObject()
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//if there a static object, actually return that back to ensure equality and such!
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return innerClass.objectInstance as T? ?: x
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}
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override fun write(out: JsonWriter, value: T) {
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val jsonString = gson.toJson(value)
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out.beginObject()
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val name = value.javaClass.canonicalName
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out.name(name.splitToSequence(".").last()).jsonValue(jsonString)
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out.endObject()
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}
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}
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}
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@ -0,0 +1,18 @@
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package info.nightscout.androidaps.utils.serialisation
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import com.google.gson.reflect.TypeToken
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import info.nightscout.androidaps.database.entities.XXXValueWithUnit
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import info.nightscout.androidaps.utils.ValueWithUnitWrapper
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object ValueWithUnitSerialiser {
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fun toSealedClassJson(list: List<XXXValueWithUnit>): String =
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list.map { ValueWithUnitWrapper(it) }.let { SealedClassHelper.gson.toJson(it) }
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fun fromJson(string: String): List<XXXValueWithUnit> {
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val itemType = object : TypeToken<List<ValueWithUnitWrapper>>() {}.type
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return SealedClassHelper.gson.fromJson<List<ValueWithUnitWrapper>>(string, itemType).map { it.wrapped }
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}
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}
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@ -1,39 +0,0 @@
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package info.nightscout.androidaps.utils
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import info.nightscout.androidaps.database.entities.XXXValueWithUnit
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import org.junit.Assert.assertEquals
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import org.junit.Assert.assertNotNull
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import org.junit.Test
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class SealedClassHelperKtTest {
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@Test
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fun testSerialisationDeserization() {
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val list = listOf<XXXValueWithUnit>(
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XXXValueWithUnit.SimpleString("hello"),
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XXXValueWithUnit.SimpleInt(5),
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XXXValueWithUnit.UNKNOWN
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)
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val serialized = toSealedClassJson(list)
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val deserialized = fromJson(serialized)
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assertEquals(3, list.size)
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assertEquals(list, deserialized)
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}
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@Test
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fun testEmptyList() {
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val list = listOf<XXXValueWithUnit>()
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val serialized = toSealedClassJson(list)
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val deserialized = fromJson(serialized)
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assertEquals(0, list.size)
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assertEquals(list, deserialized)
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}
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}
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@ -0,0 +1,36 @@
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package info.nightscout.androidaps.utils.serialisation
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import info.nightscout.androidaps.database.entities.XXXValueWithUnit
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import org.junit.Assert
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import org.junit.Test
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internal class ValueWithUnitSerialiserTest {
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@Test
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fun testSerialisationDeserization() {
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val list = listOf<XXXValueWithUnit>(
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XXXValueWithUnit.SimpleString("hello"),
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XXXValueWithUnit.SimpleInt(5),
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XXXValueWithUnit.UNKNOWN
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)
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val serialized = ValueWithUnitSerialiser.toSealedClassJson(list)
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val deserialized = ValueWithUnitSerialiser.fromJson(serialized)
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Assert.assertEquals(3, list.size)
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Assert.assertEquals(list, deserialized)
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}
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@Test
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fun testEmptyList() {
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val list = listOf<XXXValueWithUnit>()
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val serialized = ValueWithUnitSerialiser.toSealedClassJson(list)
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val deserialized = ValueWithUnitSerialiser.fromJson(serialized)
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Assert.assertEquals(0, list.size)
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Assert.assertEquals(list, deserialized)
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}
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}
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