Gson TypeAdapterFactory to handle when API return empty array instead of null value

JsoJsonPreProcessingAdapterFactorynPre

/**
* Usage : gsonBuilder.registerTypeAdapterFactory(JsonPreProcessingAdapterFactory())
**/
class JsonPreProcessingAdapterFactory : TypeAdapterFactory {

    override fun <T> create(gson: Gson, type: TypeToken<T>): TypeAdapter<T>? {


        if (!Object::class.java.isAssignableFrom(type.rawType) ||
            Iterable::class.java.isAssignableFrom(type.rawType)
        )
            return null

        val delegate = gson.getDelegateAdapter(this, type)

        return object : TypeAdapter<T>() {
            @Throws(IOException::class)
            override fun write(out: JsonWriter, value: T?) {
                delegate.write(out, value)
            }

            @Throws(IOException::class)
            override fun read(`in`: JsonReader): T? {
                return if (`in`.peek() == JsonToken.BEGIN_ARRAY) {
                    `in`.skipValue()
                    null
                }

                else
                    delegate.read(`in`) ?: null
            }
        }
    }
}