Package graphql.schema.fetching

Class LambdaFetchingSupport

  • public class LambdaFetchingSupport
extends java.lang.Object

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      private static java.lang.reflect.Method checkForSingleParameterPeer​(java.lang.reflect.Method candidateMethod, java.util.List<java.lang.reflect.Method> allMethods)  
      static java.util.Optional<java.util.function.Function<java.lang.Object,​java.lang.Object>> createGetter​(java.lang.Class<?> sourceClass, java.lang.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 java.lang.String decapitalize​(java.lang.String name)  
      private static java.lang.reflect.Method findBestBooleanGetter​(java.util.List<java.lang.reflect.Method> methods)  
      private static java.util.List<java.lang.reflect.Method> findMethodsForProperty​(java.lang.Class<?> sourceClass, java.util.function.Predicate<java.lang.reflect.Method> predicate)
      Finds all methods in a class hierarchy that match the property name - they might not be suitable but they
      private static java.lang.reflect.Method getCandidateMethod​(java.lang.Class<?> sourceClass, java.lang.String propertyName)  
      private static java.lang.invoke.MethodHandles.Lookup getLookup​(java.lang.Class<?> targetClass)  
      private static boolean hasNoParameters​(java.lang.reflect.Method method)  
      private static boolean isBooleanGetter​(java.lang.reflect.Method method)  
      private static boolean isGetterNamed​(java.lang.reflect.Method method)  
      private static boolean isObjectMethod​(java.lang.reflect.Method method)  
      private static boolean isPossiblePojoMethod​(java.lang.reflect.Method method)  
      private static boolean isPublic​(java.lang.reflect.Method method)  
      private static boolean isRecordLike​(java.lang.reflect.Method method)  
      (package private) static java.util.function.Function<java.lang.Object,​java.lang.Object> mkCallFunction​(java.lang.Class<?> targetClass, java.lang.String targetMethod, java.lang.Class<?> targetMethodReturnType)  
      private static java.lang.String mkPropertyNameGetter​(java.lang.reflect.Method method)  
      private static boolean returnsSomething​(java.lang.reflect.Method method)  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • LambdaFetchingSupport

        public LambdaFetchingSupport()

    • Method Detail

      • createGetter

        public static java.util.Optional<java.util.function.Function<java.lang.Object,​java.lang.Object>> createGetter​(java.lang.Class<?> sourceClass,
                                                                                                                    java.lang.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 java.lang.reflect.Method getCandidateMethod​(java.lang.Class<?> sourceClass,
                                                           java.lang.String propertyName)

      • checkForSingleParameterPeer

        private static java.lang.reflect.Method checkForSingleParameterPeer​(java.lang.reflect.Method candidateMethod,
                                                                    java.util.List<java.lang.reflect.Method> allMethods)

      • findBestBooleanGetter

        private static java.lang.reflect.Method findBestBooleanGetter​(java.util.List<java.lang.reflect.Method> methods)

      • findMethodsForProperty

        private static java.util.List<java.lang.reflect.Method> findMethodsForProperty​(java.lang.Class<?> sourceClass,
                                                                               java.util.function.Predicate<java.lang.reflect.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​(java.lang.reflect.Method method)

      • isRecordLike

        private static boolean isRecordLike​(java.lang.reflect.Method method)

      • isBooleanGetter

        private static boolean isBooleanGetter​(java.lang.reflect.Method method)

      • hasNoParameters

        private static boolean hasNoParameters​(java.lang.reflect.Method method)

      • isGetterNamed

        private static boolean isGetterNamed​(java.lang.reflect.Method method)

      • returnsSomething

        private static boolean returnsSomething​(java.lang.reflect.Method method)

      • isPublic

        private static boolean isPublic​(java.lang.reflect.Method method)

      • isObjectMethod

        private static boolean isObjectMethod​(java.lang.reflect.Method method)

      • mkPropertyNameGetter

        private static java.lang.String mkPropertyNameGetter​(java.lang.reflect.Method method)

      • decapitalize

        private static java.lang.String decapitalize​(java.lang.String name)

      • mkCallFunction

        static java.util.function.Function<java.lang.Object,​java.lang.Object> mkCallFunction​(java.lang.Class<?> targetClass,
                                                                                           java.lang.String targetMethod,
                                                                                           java.lang.Class<?> targetMethodReturnType)
                                                                                    throws java.lang.Throwable
        Throws:
        java.lang.Throwable

      • getLookup

        private static java.lang.invoke.MethodHandles.Lookup getLookup​(java.lang.Class<?> targetClass)