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Apollo GraphQL API classes

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package com.apollographql.apollo.api

import com.apollographql.apollo.exception.ApolloException
import com.apollographql.apollo.exception.ApolloGraphQLException
import com.apollographql.apollo.exception.DefaultApolloException

sealed interface FieldResult {
  class Success(val value: V) : FieldResult
  class Failure(val exception: ApolloException) : FieldResult
}

val  FieldResult.isSuccess: Boolean get() = this is FieldResult.Success
fun  FieldResult.getOrElse(fallback: V): V = if (this is FieldResult.Success) value else fallback
fun  FieldResult.getOrNull(): V? = if (this is FieldResult.Success) value else null
fun  FieldResult.exceptionOrNull(): Exception? = if (this is FieldResult.Failure) exception else null
fun  FieldResult.graphQLErrorOrNull(): Error? = (exceptionOrNull() as? ApolloGraphQLException)?.error

fun  FieldResult.getOrThrow(): V {
  return when (this) {
    is FieldResult.Success -> value
    is FieldResult.Failure -> throw DefaultApolloException("Field error", exception)
  }
}