Examples of java.lang.reflect.ParameterizedType

java.lang.reflect.ParameterizedType
ParameterizedType represents a parameterized type such as Collection<String>.
A parameterized type is created the first time it is needed by a reflective method, as specified in this package. When a parameterized type p is created, the generic type declaration that p instantiates is resolved, and all type arguments of p are created recursively. See {@link java.lang.reflect.TypeVariable TypeVariable} for details on the creation process for typevariables. Repeated creation of a parameterized type has no effect.
Instances of classes that implement this interface must implement an equals() method that equates any two instances that share the same generic type declaration and have equal type parameters. @since 1.5

         return (Class<?>) type;


      }
      else if (type instanceof ParameterizedType)
      {
         ParameterizedType parameterizedType = (ParameterizedType) type;
         Type rawType = parameterizedType.getRawType();
         return (Class<?>) rawType;
      }
      else if (type instanceof GenericArrayType)
      {
         final GenericArrayType genericArrayType = (GenericArrayType) type;

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    * @return null if there is no type parameter
    */
   public static Class<?> getTypeArgument(Type genericType)
   {
      if (!(genericType instanceof ParameterizedType)) return null;
      ParameterizedType parameterizedType = (ParameterizedType) genericType;
      Class<?> typeArg = (Class<?>) parameterizedType.getActualTypeArguments()[0];
      return typeArg;
   }

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   public static Class getCollectionBaseType(Class type, Type genericType)
   {
      if (genericType instanceof ParameterizedType)
      {
         ParameterizedType parameterizedType = (ParameterizedType) genericType;
         Type componentGenericType = parameterizedType.getActualTypeArguments()[0];
         return getRawType(componentGenericType);
      }
      else if (genericType instanceof GenericArrayType)
      {
         final GenericArrayType genericArrayType = (GenericArrayType) genericType;

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   public static Class getMapKeyType(Type genericType)
   {
      if (genericType instanceof ParameterizedType)
      {
         ParameterizedType parameterizedType = (ParameterizedType) genericType;
         Type componentGenericType = parameterizedType.getActualTypeArguments()[0];
         return getRawType(componentGenericType);
      }
      return null;
   }

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   public static Class getMapValueType(Type genericType)
   {
      if (genericType instanceof ParameterizedType)
      {
         ParameterizedType parameterizedType = (ParameterizedType) genericType;
         Type componentGenericType = parameterizedType.getActualTypeArguments()[1];
         return getRawType(componentGenericType);
      }
      return null;
   }

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         while (clazz.getSuperclass() != null)
         {
            if (clazz.getSuperclass().equals(classDeclaringTypeVariable))
            {
               // found it
               ParameterizedType parameterizedSuperclass = (ParameterizedType) clazz.getGenericSuperclass();


               for (int i = 0; i < classDeclaringTypeVariable.getTypeParameters().length; i++)
               {
                  TypeVariable<?> tv = classDeclaringTypeVariable.getTypeParameters()[i];
                  if (tv.equals(typeVariable))
                  {
                     return parameterizedSuperclass.getActualTypeArguments()[i];
                  }
               }
            }


            clazz = clazz.getSuperclass();

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      for (Type genericInterface : clazz.getGenericInterfaces())
      {


         if (genericInterface instanceof ParameterizedType)
         {
            ParameterizedType parameterizedType = (ParameterizedType) genericInterface;


            for (int i = 0; i < classDeclaringTypeVariable.getTypeParameters().length; i++)
            {
               TypeVariable<?> tv = classDeclaringTypeVariable.getTypeParameters()[i];
               if (tv.equals(typeVariable))
               {
                  return parameterizedType.getActualTypeArguments()[i];
               }
            }
         }
         else if (genericInterface instanceof Class)
         {

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         if (genericType == null || !(genericType instanceof ParameterizedType))
         {
            throw new RuntimeException("MarshalledEntity must have type information.");
         }
         isMarshalledEntity = true;
         ParameterizedType param = (ParameterizedType) genericType;
         this.genericType = param.getActualTypeArguments()[0];
         this.type = Types.getRawType(this.genericType);
      }
      else
      {
         this.type = type;

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      if (!mediaType.equals(MediaType.APPLICATION_FORM_URLENCODED_TYPE)) return false;
      if (!MultivaluedMap.class.isAssignableFrom(type)) return false;
      if (genericType == null) return true;


      if (!(genericType instanceof ParameterizedType)) return false;
      ParameterizedType params = (ParameterizedType) genericType;
      if (params.getActualTypeArguments().length != 2) return false;
      return params.getActualTypeArguments()[0].equals(String.class) && params.getActualTypeArguments()[1].equals(String.class);
   }

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      Class<?> useType = type;
      boolean isMarshalledEntity = false;
      if (type.equals(MarshalledEntity.class))
      {
         isMarshalledEntity = true;
         ParameterizedType param = (ParameterizedType) useGeneric;
         useGeneric = param.getActualTypeArguments()[0];
         useType = Types.getRawType(useGeneric);
      }




      MessageBodyReader reader1 = providerFactory.getMessageBodyReader(useType,

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