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
private static Method	checkForSingleParameterPeer(Method candidateMethod, List<Method> allMethods)
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.
private static String	decapitalize(String name)
private static Method	findBestBooleanGetter(List<Method> methods)
private static List<Method>	findMethodsForProperty(Class<?> sourceClass, Predicate<Method> predicate)	Finds all methods in a class hierarchy that match the property name - they might not be suitable but they
private static Method	getCandidateMethod(Class<?> sourceClass, String propertyName)
private static MethodHandles.Lookup	getLookup(Class<?> targetClass)
private static boolean	hasNoParameters(Method method)
private static boolean	isBooleanGetter(Method method)
private static boolean	isGetterNamed(Method method)
private static boolean	isObjectMethod(Method method)
private static boolean	isPossiblePojoMethod(Method method)
private static boolean	isPublic(Method method)
private static boolean	isRecordLike(Method method)
(package private) static Function<Object,Object>	mkCallFunction(Class<?> targetClass, String targetMethod, Class<?> targetMethodReturnType)
private static String	mkPropertyNameGetter(Method method)
private static boolean	returnsSomething(Method method)

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

getCandidateMethod

private static Method getCandidateMethod(Class<?> sourceClass,
 String propertyName)

checkForSingleParameterPeer

private static Method checkForSingleParameterPeer(Method candidateMethod,
 List<Method> allMethods)

findBestBooleanGetter

private static Method findBestBooleanGetter(List<Method> methods)

findMethodsForProperty

private static List<Method> findMethodsForProperty(Class<?> sourceClass,
 Predicate<Method> predicate)

Finds all methods in a class hierarchy that match the property name - they might not be suitable but they

Parameters:

sourceClass - the class we are looking to work on

Returns:

a list of getter methods for that property

isPossiblePojoMethod

private static boolean isPossiblePojoMethod(Method method)

isRecordLike

private static boolean isRecordLike(Method method)

isBooleanGetter

private static boolean isBooleanGetter(Method method)

hasNoParameters

private static boolean hasNoParameters(Method method)

isGetterNamed

private static boolean isGetterNamed(Method method)

returnsSomething

private static boolean returnsSomething(Method method)

isPublic

private static boolean isPublic(Method method)

isObjectMethod

private static boolean isObjectMethod(Method method)

mkPropertyNameGetter

private static String mkPropertyNameGetter(Method method)

decapitalize

private static String decapitalize(String name)

mkCallFunction

static Function<Object,Object> mkCallFunction(Class<?> targetClass,
 String targetMethod,
 Class<?> targetMethodReturnType)
                                       throws Throwable

Throws:

Throwable

getLookup

private static MethodHandles.Lookup getLookup(Class<?> targetClass)