Package org.apache.tapestry5.commons.internal.util

Class GenericsUtils

  • public class GenericsUtils
extends java.lang.Object
    Static methods related to the use of JDK 1.5 generics. From Tapestry 5.5.0, this class just delegates to GenericsResolver.

    • Constructor Summary

      Constructors 
      Constructor Description
      GenericsUtils()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.Class asClass​(java.lang.reflect.Type actualType)
      Get the class represented by the reflected type.
      static java.lang.reflect.Type extractActualType​(java.lang.reflect.Type containingType, java.lang.reflect.Field field)
      Analyzes the method in the context of containingClass and returns the Class that is represented by the method's generic return type.
      static java.lang.reflect.Type extractActualType​(java.lang.reflect.Type containingType, java.lang.reflect.Method method)
      Analyzes the method in the context of containingClass and returns the Class that is represented by the method's generic return type.
      static java.lang.Class extractGenericFieldType​(java.lang.Class containingClass, java.lang.reflect.Field field)
      Analyzes the field in the context of containingClass and returns the Class that is represented by the field's generic type.
      static java.lang.Class<?> extractGenericReturnType​(java.lang.Class<?> containingClass, java.lang.reflect.Method method)
      Analyzes the method in the context of containingClass and returns the Class that is represented by the method's generic return type.
      static java.lang.reflect.Type resolve​(java.lang.reflect.Type type, java.lang.reflect.Type containingType)
      Resolves the type parameter based on the context of the containingType.

      • Methods inherited from class java.lang.Object

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

    • Method Detail

      • extractActualType

        public static java.lang.reflect.Type extractActualType​(java.lang.reflect.Type containingType,
                                                       java.lang.reflect.Method method)
        Analyzes the method in the context of containingClass and returns the Class that is represented by the method's generic return type. Any parameter information in the generic return type is lost.
        Parameters:
        containingType - Type which is/represents the class that either contains or inherited the method
        method - method from which to extract the generic return type
        Returns:
        the generic type represented by the methods generic return type, resolved based on the containingType.
        See Also:
        resolve(java.lang.reflect.Type,java.lang.reflect.Type)

      • extractActualType

        public static java.lang.reflect.Type extractActualType​(java.lang.reflect.Type containingType,
                                                       java.lang.reflect.Field field)
        Analyzes the method in the context of containingClass and returns the Class that is represented by the method's generic return type. Any parameter information in the generic return type is lost.
        Parameters:
        containingType - Type which is/represents the class that either contains or inherited the field
        field - field from which to extract the generic return type
        Returns:
        the generic type represented by the methods generic return type, resolved based on the containingType.
        See Also:
        resolve(java.lang.reflect.Type,java.lang.reflect.Type)

      • resolve

        public static java.lang.reflect.Type resolve​(java.lang.reflect.Type type,
                                             java.lang.reflect.Type containingType)
        Resolves the type parameter based on the context of the containingType. TypeVariable will be unwrapped to the type argument resolved form the class hierarchy. This may be something other than a simple Class if the type argument is a ParameterizedType for instance (e.g. List<E>; List<Map<Long, String>>, E would be returned as a ParameterizedType with the raw type Map and type arguments Long and String.
        Parameters:
        type - the generic type (ParameterizedType, GenericArrayType, WildcardType, TypeVariable) to be resolved
        containingType - the type which his
        Returns:
        the type resolved to the best of our ability.
        Since:
        5.2.?

      • asClass

        public static java.lang.Class asClass​(java.lang.reflect.Type actualType)
        Get the class represented by the reflected type. This method is lossy; You cannot recover the type information from the class that is returned. TypeVariable the first bound is returned. If your type variable extends multiple interfaces that information is lost. WildcardType the first lower bound is returned. If the wildcard is defined with upper bounds then Object is returned.
        Parameters:
        actualType - a Class, ParameterizedType, GenericArrayType
        Returns:
        the un-parameterized class associated with the type.