Package graphql.schema.fetching

Class LambdaFetchingSupport

java.lang.Object

graphql.schema.fetching.LambdaFetchingSupport

public class LambdaFetchingSupport
extends Object

Constructor Summary

Constructors

Constructor	Description
LambdaFetchingSupport()

Method Summary

Modifier and Type	Method	Description
static Optional<Function<Object,Object>>	createGetter(Class<?> sourceClass, String propertyName)	This support class will use LambdaMetafactory and MethodHandles to create a dynamic function that allows access to a public getter method on the nominated class.

Methods inherited from class java.lang.Object

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

Constructor Details

LambdaFetchingSupport

public LambdaFetchingSupport()

Method Details

createGetter

public static Optional<Function<Object,Object>> createGetter(Class<?> sourceClass,
 String propertyName)

This support class will use LambdaMetafactory and MethodHandles to create a dynamic function that allows access to a public getter method on the nominated class. MethodHandles is a caller senstive lookup mechanism. If the graphql-java cant lookup a class, then it won't be able to make dynamic lambda function to it.

If one cant be made, because it doesn't exist or the calling class does not have access to the method, then it will return an empty result indicating that this strategy cant be used.

Parameters:

sourceClass - the class that has the property getter method

propertyName - the name of the property to get

Returns:

a function that can be used to pass in an instance of source class and returns its getter method value