程序包 cn.taketoday.core

类 GenericTypeResolver

java.lang.Object
cn.taketoday.core.GenericTypeResolver
public abstract class GenericTypeResolver extends Object
Helper class for resolving generic types against type variables.

Mainly intended for usage within the framework, resolving method parameter types even when they are declared generically.

从以下版本开始:
3.0
作者:
Juergen Hoeller, Rob Harrop, Sam Brannen, TODAY 2021/3/8 18:22

  • 字段详细资料

  • 构造器详细资料

    • GenericTypeResolver

      public GenericTypeResolver()

  • 方法详细资料

    • resolveReturnType

      public static Class<?> resolveReturnType(Method method, Class<?> clazz)
      Determine the target type for the generic return type of the given method, where formal type variables are declared on the given class.
      参数:
      method - the method to introspect
      clazz - the class to resolve type variables against
      返回:
      the corresponding generic parameter or return type

    • resolveReturnTypeArgument

      @Nullable public static Class<?> resolveReturnTypeArgument(Method method, Class<?> genericIfc)
      Resolve the single type argument of the given generic interface against the given target method which is assumed to return the given interface or an implementation of it.
      参数:
      method - the target method to check the return type of
      genericIfc - the generic interface or superclass to resolve the type argument from
      返回:
      the resolved parameter type of the method return type, or null if not resolvable or if the single argument is of type WildcardType.

    • resolveTypeArgument

      @Nullable public static <T> Class<T> resolveTypeArgument(Class<?> clazz, Class<?> genericIfc)
      Resolve the single type argument of the given generic interface against the given target class which is assumed to implement the generic interface and possibly declare a concrete type for its type variable.
      参数:
      clazz - the target class to check against
      genericIfc - the generic interface or superclass to resolve the type argument from
      返回:
      the resolved type of the argument, or null if not resolvable

    • getSingleGeneric

      @Nullable private static <T> Class<T> getSingleGeneric(ResolvableType resolvableType)

    • resolveTypeArguments

      @Nullable public static Class<?>[] resolveTypeArguments(Class<?> clazz, Class<?> genericIfc)
      Resolve the type arguments of the given generic interface against the given target class which is assumed to implement the generic interface and possibly declare concrete types for its type variables.
      参数:
      clazz - the target class to check against
      genericIfc - the generic interface or superclass to resolve the type argument from
      返回:
      the resolved type of each argument, with the array size matching the number of actual type arguments, or null if not resolvable

    • resolveType

      public static Type resolveType(Type genericType, @Nullable Class<?> contextClass)
      Resolve the given generic type against the given context class, substituting type variables as far as possible.
      参数:
      genericType - the (potentially) generic type
      contextClass - a context class for the target type, for example a class in which the target type appears in a method signature (can be null)
      返回:
      the resolved type (possibly the given generic type as-is)

    • resolveVariable

      private static ResolvableType resolveVariable(TypeVariable<?> typeVariable, ResolvableType contextType)

    • resolveWildcard

      private static ResolvableType resolveWildcard(WildcardType wildcardType, ResolvableType contextType)

    • resolveType

      public static Class<?> resolveType(Type genericType, Map<TypeVariable,Type> map)
      Resolve the specified generic type against the given TypeVariable map.
      参数:
      genericType - the generic type to resolve
      map - the TypeVariable Map to resolved against
      返回:
      the type if it resolves to a Class, or Object.class otherwise

    • getTypeVariableMap

      public static Map<TypeVariable,Type> getTypeVariableMap(Class<?> clazz)
      Build a mapping of TypeVariable names to concrete classes for the specified Class. Searches all super types, enclosing types and interfaces.
      另请参阅:

    • buildTypeVariableMap

      private static void buildTypeVariableMap(ResolvableType type, Map<TypeVariable,Type> typeVariableMap)