call_adapter_factory

call_adapter_factory.kt

class NetworkResultCallAdapterFactory private constructor() : CallAdapter.Factory() {

    override fun get(
        returnType: Type,
        annotations: Array<out Annotation>,
        retrofit: Retrofit
    ): CallAdapter<*, *>? {
        if (getRawType(returnType) != Call::class.java) {
            return null
        }

        val callType = getParameterUpperBound(0, returnType as ParameterizedType)
        if (getRawType(callType) != NetworkResult::class.java) {
            return null
        }

        val resultType = getParameterUpperBound(0, callType as ParameterizedType)
        return NetworkResultCallAdapter(resultType)
    }

    companion object {
        fun create(): NetworkResultCallAdapterFactory = NetworkResultCallAdapterFactory()
    }
}