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

        for (Field f : ClassUtils.getFields(clazz)) {
            if (f.getAnnotation(org.hibernate.search.annotations.Field.class) != null) fields.add(prefix + f.getName());
            if (f.getAnnotation(IndexedEmbedded.class) != null) {
                Class<?> fieldClass = f.getType();
                if (Collection.class.isAssignableFrom(fieldClass)) {
                    ParameterizedType coltype = (ParameterizedType) f.getGenericType();
                    fields.addAll(getAllIndexedFields((Class<?>) coltype.getActualTypeArguments()[0], prefix + f.getName() + "."));
                } else fields.addAll(getAllIndexedFields(fieldClass, prefix + f.getName() + "."));
            }
        }
        return fields;
    }

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    public static Class<?> getGenericType(Field field) {
        Class<?> clazz = null;
        if (field != null) {
            Type t = field.getGenericType();
            if (t instanceof ParameterizedType) {
                ParameterizedType type = (ParameterizedType) t;
                if ((type != null) && (type.getActualTypeArguments() != null) && (type.getActualTypeArguments().length > 0)) clazz = (Class<?>) type.getActualTypeArguments()[0];
            } else if (t instanceof Class) clazz = (Class<?>) t;
        }
        return clazz;
    }

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    }


    public static Class<?> getGenericType(Field field) {
        Class<?> clazz = null;
        if (field != null) {
            ParameterizedType type = (ParameterizedType) field.getGenericType();
            if ((type != null) && (type.getActualTypeArguments() != null) && (type.getActualTypeArguments().length > 0)) clazz = (Class<?>) type.getActualTypeArguments()[0];
        }
        return clazz;
    }

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    private Object getGenericComponent(Object genericType, int index)
    {
        if (genericType instanceof ParameterizedType)
        {
            ParameterizedType type = (ParameterizedType) genericType;


            if (type.getActualTypeArguments()[index] instanceof WildcardType)
            {
                WildcardType wildcardType = (WildcardType) type.getActualTypeArguments()[index];


                return wildcardType;
            }
            else if (type.getActualTypeArguments()[index] instanceof ParameterizedType)
            {
                ParameterizedType ptype = (ParameterizedType) type.getActualTypeArguments()[index];
                
                return ptype;
            }
        }

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    {
        Class paramClass = null;


        if (genericType instanceof ParameterizedType)
        {
            ParameterizedType type = (ParameterizedType) genericType;


            if (type.getActualTypeArguments()[index] instanceof Class)
            {
                paramClass = (Class) type.getActualTypeArguments()[index];
            }


            else if (type.getActualTypeArguments()[index] instanceof WildcardType)
            {
                WildcardType wildcardType = (WildcardType) type.getActualTypeArguments()[index];


                if (wildcardType.getUpperBounds()[index] instanceof Class)
                {
                    paramClass = (Class) wildcardType.getUpperBounds()[index];
                }
            }
            else if (type.getActualTypeArguments()[index] instanceof ParameterizedType)
            {
                ParameterizedType ptype = (ParameterizedType) type.getActualTypeArguments()[index];
                paramClass = (Class) ptype.getRawType();
            }
        }
        return paramClass;
    }

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    {
        Class paramClass = null;


        if (genericType instanceof ParameterizedType)
        {
            ParameterizedType type = (ParameterizedType) genericType;


            if (type.getActualTypeArguments()[index] instanceof Class)
            {
                paramClass = (Class) type.getActualTypeArguments()[index];
            }


            else if (type.getActualTypeArguments()[index] instanceof WildcardType)
            {
                WildcardType wildcardType = (WildcardType) type.getActualTypeArguments()[index];


                if (wildcardType.getUpperBounds()[index] instanceof Class)
                {
                    paramClass = (Class) wildcardType.getUpperBounds()[index];
                }
            }
            else if (type.getActualTypeArguments()[index] instanceof ParameterizedType)
            {
                ParameterizedType ptype = (ParameterizedType) type.getActualTypeArguments()[index];
                paramClass = (Class) ptype.getRawType();
            }
        }
        return paramClass;
    }

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            cls = callback.getMethod().getParameterTypes()[idx];
            if (cls.isAssignableFrom(Holder.class)) {
                //INOUT and OUT Params are mapped to Holder<T>. 
                Type[] genericParameterTypes = callback.getMethod().getGenericParameterTypes();
                //ParameterizedType represents Holder<?>
                ParameterizedType paramType = (ParameterizedType)genericParameterTypes[idx];
                cls = JAXBEncoderDecoder.getClassFromType(
                                         paramType.getActualTypeArguments()[0]);                
            }
        }
        Node xmlNode = (Node)input;
        
        return JAXBEncoderDecoder.unmarshall(callback.getJAXBContext(),

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                    Class<?> cls = callback.getMethod().getParameterTypes()[idx];                
                    if (param.mode() != WebParam.Mode.IN) {
                        //INOUT and OUT Params are mapped to Holder<T>. 
                        Type[] genericParameterTypes = callback.getMethod().getGenericParameterTypes();
                        //ParameterizedType represents Holder<?>
                        ParameterizedType paramType = (ParameterizedType)genericParameterTypes[idx];
                        Class<?> c = 
                            JAXBEncoderDecoder.getClassFromType(paramType.getActualTypeArguments()[0]);
                        Object partValue = callback.getWrappedPart(param.name(), obj, c);
                        //TO avoid type safety warning the Holder 
                        //needs tobe set as below.                        
                        cls.getField("value").set(methodArgs[idx], partValue);
                    } else {

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            return (Class)t;
        } else if (t instanceof GenericArrayType) {
            GenericArrayType g = (GenericArrayType)t;
            return Array.newInstance(getClassFromType(g.getGenericComponentType()), 0).getClass();
        } else if (t instanceof ParameterizedType) {
            ParameterizedType p = (ParameterizedType)t;
            return getClassFromType(p.getRawType());
        }
        //TypeVariable and WildCardType are not handled as it is unlikely such Types will 
        // JAXB Code Generated.
        assert false;
        throw new IllegalArgumentException("Cannot get Class object from unknown Type");

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        return Holder.class.isAssignableFrom(cType);
        // set the actual type argument of Holder in the TypeReference
    }


    private Class getHoldedClass(Class holderClazz, Type type) {
        ParameterizedType pt = (ParameterizedType)type;
        return getClass(pt.getActualTypeArguments()[0]);
    }

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