graphql.schema

Class DataFetcherFactories

java.lang.Object

graphql.schema.DataFetcherFactories

@PublicApi
public class DataFetcherFactories
extends java.lang.Object

A helper for DataFetcherFactory

Constructor Summary

Constructors

Constructor and Description
DataFetcherFactories()

Method Summary

Modifier and Type	Method and Description
static <T> DataFetcherFactory<T>	useDataFetcher(DataFetcher<T> dataFetcher) Creates a DataFetcherFactory that always returns the provided DataFetcher
static DataFetcher	wrapDataFetcher(DataFetcher delegateDataFetcher, java.util.function.BiFunction<DataFetchingEnvironment,java.lang.Object,java.lang.Object> mapFunction) This helper function allows you to wrap an existing data fetcher and map the value once it completes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DataFetcherFactories

public DataFetcherFactories()

Method Detail

useDataFetcher

public static <T> DataFetcherFactory<T> useDataFetcher(DataFetcher<T> dataFetcher)

Creates a DataFetcherFactory that always returns the provided DataFetcher

Type Parameters:

T - the type of the data fetcher

Parameters:

dataFetcher - the data fetcher to always return

Returns:

a data fetcher factory that always returns the provided data fetcher

wrapDataFetcher

public static DataFetcher wrapDataFetcher(DataFetcher delegateDataFetcher,
                                          java.util.function.BiFunction<DataFetchingEnvironment,java.lang.Object,java.lang.Object> mapFunction)

This helper function allows you to wrap an existing data fetcher and map the value once it completes. It helps you handle values that might be CompletionStage returned values as well as plain old objects.

Parameters:

delegateDataFetcher - the original data fetcher that is present on a GraphQLFieldDefinition say

mapFunction - the bi function to apply to the original value

Returns:

a new data fetcher that wraps the provided data fetcher