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Some generated protocol messages require special handling.
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src/main/kotlin/com/sourcegraph/cody/agent/EnumTypeAdapterFactory.kt
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package com.sourcegraph.cody.agent | ||
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import com.google.gson.* | ||
import com.google.gson.annotations.SerializedName | ||
import com.google.gson.reflect.TypeToken | ||
import com.google.gson.stream.JsonReader | ||
import com.google.gson.stream.JsonWriter | ||
import java.io.IOException | ||
import java.lang.reflect.Field | ||
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class EnumTypeAdapterFactory : TypeAdapterFactory { | ||
override fun <T> create(gson: Gson, type: TypeToken<T>): TypeAdapter<T>? { | ||
val rawType = type.rawType as? Class<*> ?: return null | ||
if (!rawType.isEnum) { | ||
return null | ||
} | ||
@Suppress("UNCHECKED_CAST") | ||
return EnumTypeAdapter(rawType as Class<out Enum<*>>) as TypeAdapter<T> | ||
} | ||
} | ||
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class EnumTypeAdapter<T : Enum<T>>(private val classOfT: Class<T>) : TypeAdapter<T>() { | ||
private val nameToConstant: Map<String, T> = HashMap() | ||
private val constantToName: Map<T, String> = HashMap() | ||
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init { | ||
for (constant in classOfT.enumConstants) { | ||
val name = getSerializedName(constant) ?: constant.name | ||
(nameToConstant as HashMap)[name.lowercase()] = constant | ||
(constantToName as HashMap)[constant] = name | ||
} | ||
} | ||
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private fun getSerializedName(enumConstant: T): String? { | ||
return try { | ||
val field: Field = classOfT.getField(enumConstant.name) | ||
field.getAnnotation(SerializedName::class.java)?.value | ||
} catch (e: NoSuchFieldException) { | ||
null | ||
} | ||
} | ||
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override fun write(out: JsonWriter, value: T?) { | ||
if (value == null) { | ||
out.nullValue() | ||
} else { | ||
out.value(constantToName[value]) | ||
} | ||
} | ||
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@Throws(IOException::class) | ||
override fun read(`in`: JsonReader): T? { | ||
val value = `in`.nextString() | ||
return nameToConstant[value.lowercase()] | ||
?: throw JsonParseException("Unknown enum value: $value") | ||
} | ||
} |