Class GenericsUtils
java.lang.Object
org.apache.tapestry5.commons.internal.util.GenericsUtils
Static methods related to the use of JDK 1.5 generics. From Tapestry 5.5.0,
this class just delegates to
GenericsResolver
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic Class
Get the class represented by the reflected type.static Type
extractActualType
(Type containingType, 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 Type
extractActualType
(Type containingType, 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 Class
extractGenericFieldType
(Class containingClass, Field field) Analyzes the field in the context of containingClass and returns the Class that is represented by the field's generic type.static Class<?>
extractGenericReturnType
(Class<?> containingClass, 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 Type
Resolves the type parameter based on the context of the containingType.
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Constructor Details
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GenericsUtils
public GenericsUtils()
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Method Details
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extractGenericReturnType
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. If you want to preserve the type parameters of the return type consider usingextractActualType(java.lang.reflect.Type, java.lang.reflect.Method)
.- Parameters:
containingClass
- class which either contains or inherited the methodmethod
- method from which to extract the return type- Returns:
- the class represented by the methods generic return type, resolved based on the context .
- See Also:
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extractGenericFieldType
Analyzes the field in the context of containingClass and returns the Class that is represented by the field's generic type. Any parameter information in the generic type is lost, if you want to preserve the type parameters of the return type consider using #getTypeVariableIndex(java.lang.reflect.TypeVariable).- Parameters:
containingClass
- class which either contains or inherited the fieldfield
- field from which to extract the type- Returns:
- the class represented by the field's generic type, resolved based on the containingClass.
- See Also:
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extractActualType
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 methodmethod
- 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:
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extractActualType
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 fieldfield
- 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:
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resolve
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 resolvedcontainingType
- the type which his- Returns:
- the type resolved to the best of our ability.
- Since:
- 5.2.?
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asClass
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 thenObject
is returned.- Parameters:
actualType
- a Class, ParameterizedType, GenericArrayType- Returns:
- the un-parameterized class associated with the type.
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