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Apollo GraphQL API classes
There is a newer version: 4.1.0
package com.apollographql.apollo.api.internal

import com.apollographql.apollo.api.BigDecimal
import com.apollographql.apollo.api.CustomTypeValue
import com.apollographql.apollo.api.Operation
import com.apollographql.apollo.api.ResponseField
import com.apollographql.apollo.api.ScalarType
import com.apollographql.apollo.api.ScalarTypeAdapters
import com.apollographql.apollo.api.toNumber

class SimpleResponseReader private constructor(
    private val recordSet: Map,
    private val variableValues: Map,
    private val scalarTypeAdapters: ScalarTypeAdapters
) : ResponseReader {

  constructor(
      recordSet: Map,
      variables: Operation.Variables,
      scalarTypeAdapters: ScalarTypeAdapters
  ) : this(recordSet, variables.valueMap(), scalarTypeAdapters)

  override fun readString(field: ResponseField): String? {
    if (shouldSkip(field)) {
      return null
    }

    val value = valueFor(recordSet, field)
    return checkValue(field, value)
  }

  override fun readInt(field: ResponseField): Int? {
    if (shouldSkip(field)) {
      return null
    }

    val value = valueFor(recordSet, field)
    checkValue(field, value)
    return value?.toNumber()?.toInt()
  }

  override fun readLong(field: ResponseField): Long? {
    if (shouldSkip(field)) {
      return null
    }

    val value = valueFor(recordSet, field)
    checkValue(field, value)
    return value?.toNumber()?.toLong()
  }

  override fun readDouble(field: ResponseField): Double? {
    if (shouldSkip(field)) {
      return null
    }

    val value = valueFor(recordSet, field)
    checkValue(field, value)
    return value?.toNumber()?.toDouble()
  }

  override fun readBoolean(field: ResponseField): Boolean? {
    if (shouldSkip(field)) {
      return null
    }

    val value = valueFor(recordSet, field)
    return checkValue(field, value)
  }

  override fun  readObject(field: ResponseField, objectReader: ResponseReader.ObjectReader): T? {
    if (shouldSkip(field)) {
      return null
    }

    val value = valueFor>(recordSet, field)
    checkValue(field, value)

    return value?.let {
      objectReader.read(SimpleResponseReader(it, variableValues, scalarTypeAdapters))
    }
  }

  @Suppress("UNCHECKED_CAST")
  override fun  readList(field: ResponseField, listReader: ResponseReader.ListReader): List? {
    if (shouldSkip(field)) {
      return null
    }

    val values = valueFor>(recordSet, field)
    checkValue(field, values)

    return values?.map { value ->
      value?.let { listReader.read(ListItemReader(field, it)) }
    }
  }

  override fun  readCustomType(field: ResponseField.CustomTypeField): T? {
    if (shouldSkip(field)) {
      return null
    }

    val value = valueFor(recordSet, field)
    checkValue(field, value)

    return value?.let {
      val typeAdapter = scalarTypeAdapters.adapterFor(field.scalarType)
      typeAdapter.decode(CustomTypeValue.fromRawValue(it))
    }
  }

  override fun  readFragment(field: ResponseField, objectReader: ResponseReader.ObjectReader): T? {
    if (shouldSkip(field)) {
      return null
    }

    val value = valueFor(recordSet, field)
    checkValue(field, value)

    return value?.let { typename ->
      field.conditions
          .mapNotNull { condition -> condition as? ResponseField.TypeNameCondition }
          .all { condition -> condition.typeNames.contains(typename) }
          .let { matchAllTypeConditions ->
            if (matchAllTypeConditions) objectReader.read(this) else null
          }
    }
  }

  private fun shouldSkip(field: ResponseField): Boolean {
    for (condition in field.conditions) {
      if (condition is ResponseField.BooleanCondition) {
        val conditionValue = variableValues[condition.variableName] as Boolean?
        if (condition.isInverted) {
          // means it's a skip directive
          if (conditionValue == true) {
            return true
          }
        } else {
          // means it's an include directive
          if (conditionValue == false) {
            return true
          }
        }
      }
    }
    return false
  }

  private fun  checkValue(field: ResponseField, value: V?): V? {
    if (!field.optional && value == null) {
      throw NullPointerException("corrupted response reader, expected non null value for " + field.fieldName)
    }

    return value
  }

  private inner class ListItemReader internal constructor(
      private val field: ResponseField,
      private val value: Any
  ) : ResponseReader.ListItemReader {

    override fun readString(): String {
      return value as String
    }

    override fun readInt(): Int {
      return (value as BigDecimal).toNumber().toInt()
    }

    override fun readLong(): Long {
      return (value as BigDecimal).toNumber().toLong()
    }

    override fun readDouble(): Double {
      return (value as BigDecimal).toNumber().toDouble()
    }

    override fun readBoolean(): Boolean {
      return value as Boolean
    }

    override fun  readCustomType(scalarType: ScalarType): T {
      val typeAdapter = scalarTypeAdapters.adapterFor(scalarType)
      return typeAdapter.decode(CustomTypeValue.fromRawValue(value))
    }

    @Suppress("UNCHECKED_CAST")
    override fun  readObject(objectReader: ResponseReader.ObjectReader): T {
      val value = this.value as Map
      return objectReader.read(SimpleResponseReader(value, variableValues, scalarTypeAdapters))
    }

    @Suppress("UNCHECKED_CAST")
    override fun  readList(listReader: ResponseReader.ListReader): List {
      val values = value as List<*>

      return values.map { value ->
        value?.let { listReader.read(ListItemReader(field, it)) }
      }
    }
  }

  private inline fun  valueFor(map: Map, field: ResponseField): T? {
    return when (val value = map[field.responseName]) {
      null -> null
      is T -> value
      else -> throw ClassCastException(
          "The value for \"${field.responseName}\" expected to be of type \"${T::class.simpleName}\" but was \"${value::class.simpleName}\""
      )
    }
  }
}