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[Kotlin] Add polymorphic support for Gson #7164

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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ dependencies {
{{/moshi}}
{{#gson}}
compile "com.google.code.gson:gson:2.8.6"
compile "io.gsonfire:gson-fire:1.8.0"
{{/gson}}
{{#jackson}}
compile "com.fasterxml.jackson.module:jackson-module-kotlin:2.10.2"
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,9 @@ import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
{{#gson}}
import com.google.gson.Gson
import com.google.gson.GsonBuilder
import com.google.gson.JsonElement
import io.gsonfire.GsonFireBuilder
import io.gsonfire.TypeSelector
{{^threetenbp}}
import java.time.LocalDate
import java.time.LocalDateTime
Expand All @@ -21,6 +24,14 @@ import org.threeten.bp.LocalDateTime
import org.threeten.bp.OffsetDateTime
{{/threetenbp}}
import java.util.UUID
{{#models.0}}
import {{modelPackage}}.*
{{/models.0}}
import kotlin.collections.HashMap
import kotlin.collections.MutableMap
import kotlin.collections.get
import kotlin.collections.set
import kotlin.collections.toTypedArray
{{/gson}}
{{#jackson}}
import com.fasterxml.jackson.databind.ObjectMapper
Expand Down Expand Up @@ -53,17 +64,44 @@ import java.util.Date
{{/moshi}}
{{#gson}}
@JvmStatic
val gsonBuilder: GsonBuilder = GsonBuilder()
var gsonBuilder = GsonFireBuilder(){{#models}}{{#model}}{{#discriminator}}
.registerTypeSelector<{{classname}}>({{classname}}::class.java, TypeSelector<{{classname}}?> { readElement ->
val classByDiscriminatorValue: MutableMap<String, Any?> = HashMap()
{{#mappedModels}}
classByDiscriminatorValue["{{mappingName}}".toUpperCase()] = {{modelName}}::class.java
{{/mappedModels}}

try {
return@TypeSelector getClassByDiscriminator(
classByDiscriminatorValue,
getDiscriminatorValue(readElement, "{{propertyName}}")) as Class<out {{classname}}?>?
} catch (ex: IllegalArgumentException) { return@TypeSelector {{classname}}::class.java}
}){{/discriminator}}{{/model}}{{/models}}
.createGsonBuilder()
.registerTypeAdapter(Date::class.java, DateAdapter())
.registerTypeAdapter(OffsetDateTime::class.java, OffsetDateTimeAdapter())
.registerTypeAdapter(LocalDateTime::class.java, LocalDateTimeAdapter())
.registerTypeAdapter(LocalDate::class.java, LocalDateAdapter())
.registerTypeAdapter(ByteArray::class.java, ByteArrayAdapter())

@JvmStatic
val gson: Gson by lazy {
gsonBuilder.create()
}

fun getDiscriminatorValue(readElement: JsonElement, discriminatorField: String?): String? {
val element: JsonElement = readElement.getAsJsonObject().get(discriminatorField)
?: throw IllegalArgumentException("missing discriminator field: <$discriminatorField>")
return element.getAsString()
}

fun getClassByDiscriminator(
classByDiscriminatorValue: Map<*, *>,
discriminatorValue: String?
): Class<*>? {
return classByDiscriminatorValue[discriminatorValue?.toUpperCase()] as Class<*>?
?: throw IllegalArgumentException("cannot determine model class of name: <$discriminatorValue>")
}
{{/gson}}
{{#jackson}}
@JvmStatic
Expand Down
1 change: 1 addition & 0 deletions samples/client/petstore/kotlin-gson/build.gradle
Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@ test {
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
compile "com.google.code.gson:gson:2.8.6"
compile "io.gsonfire:gson-fire:1.8.0"
compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
compile "com.squareup.okhttp3:okhttp:4.2.2"
testCompile "io.kotlintest:kotlintest-runner-junit5:3.1.0"
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -2,23 +2,47 @@ package org.openapitools.client.infrastructure

import com.google.gson.Gson
import com.google.gson.GsonBuilder
import com.google.gson.JsonElement
import io.gsonfire.GsonFireBuilder
import io.gsonfire.TypeSelector
import java.time.LocalDate
import java.time.LocalDateTime
import java.time.OffsetDateTime
import java.util.UUID
import org.openapitools.client.models.*
import kotlin.collections.HashMap
import kotlin.collections.MutableMap
import kotlin.collections.get
import kotlin.collections.set
import kotlin.collections.toTypedArray
import java.util.Date

object Serializer {
@JvmStatic
val gsonBuilder: GsonBuilder = GsonBuilder()
var gsonBuilder = GsonFireBuilder()
.createGsonBuilder()
.registerTypeAdapter(Date::class.java, DateAdapter())
.registerTypeAdapter(OffsetDateTime::class.java, OffsetDateTimeAdapter())
.registerTypeAdapter(LocalDateTime::class.java, LocalDateTimeAdapter())
.registerTypeAdapter(LocalDate::class.java, LocalDateAdapter())
.registerTypeAdapter(ByteArray::class.java, ByteArrayAdapter())

@JvmStatic
val gson: Gson by lazy {
gsonBuilder.create()
}

fun getDiscriminatorValue(readElement: JsonElement, discriminatorField: String?): String? {
val element: JsonElement = readElement.getAsJsonObject().get(discriminatorField)
?: throw IllegalArgumentException("missing discriminator field: <$discriminatorField>")
return element.getAsString()
}

fun getClassByDiscriminator(
classByDiscriminatorValue: Map<*, *>,
discriminatorValue: String?
): Class<*>? {
return classByDiscriminatorValue[discriminatorValue?.toUpperCase()] as Class<*>?
?: throw IllegalArgumentException("cannot determine model class of name: <$discriminatorValue>")
}
}
Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@ test {
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
compile "com.google.code.gson:gson:2.8.6"
compile "io.gsonfire:gson-fire:1.8.0"
compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
compile "com.squareup.okhttp3:okhttp:4.2.2"
testCompile "io.kotlintest:kotlintest-runner-junit5:3.1.0"
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -2,23 +2,47 @@ package org.openapitools.client.infrastructure

import com.google.gson.Gson
import com.google.gson.GsonBuilder
import com.google.gson.JsonElement
import io.gsonfire.GsonFireBuilder
import io.gsonfire.TypeSelector
import java.time.LocalDate
import java.time.LocalDateTime
import java.time.OffsetDateTime
import java.util.UUID
import org.openapitools.client.models.*
import kotlin.collections.HashMap
import kotlin.collections.MutableMap
import kotlin.collections.get
import kotlin.collections.set
import kotlin.collections.toTypedArray
import java.util.Date

object Serializer {
@JvmStatic
val gsonBuilder: GsonBuilder = GsonBuilder()
var gsonBuilder = GsonFireBuilder()
.createGsonBuilder()
.registerTypeAdapter(Date::class.java, DateAdapter())
.registerTypeAdapter(OffsetDateTime::class.java, OffsetDateTimeAdapter())
.registerTypeAdapter(LocalDateTime::class.java, LocalDateTimeAdapter())
.registerTypeAdapter(LocalDate::class.java, LocalDateAdapter())
.registerTypeAdapter(ByteArray::class.java, ByteArrayAdapter())

@JvmStatic
val gson: Gson by lazy {
gsonBuilder.create()
}

fun getDiscriminatorValue(readElement: JsonElement, discriminatorField: String?): String? {
val element: JsonElement = readElement.getAsJsonObject().get(discriminatorField)
?: throw IllegalArgumentException("missing discriminator field: <$discriminatorField>")
return element.getAsString()
}

fun getClassByDiscriminator(
classByDiscriminatorValue: Map<*, *>,
discriminatorValue: String?
): Class<*>? {
return classByDiscriminatorValue[discriminatorValue?.toUpperCase()] as Class<*>?
?: throw IllegalArgumentException("cannot determine model class of name: <$discriminatorValue>")
}
}