net.sf.juffrou.util.reflect

Class ReflectionUtil

java.lang.Object

net.sf.juffrou.util.reflect.ReflectionUtil

public final class ReflectionUtil
extends Object

Utility methods to provide information over generic types.

When a generic class is extended we often need to know which types were used to typify the generic.

Author:

cemartins

Constructor Summary

Constructors

Constructor and Description
ReflectionUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static void	getBeanFromMap(BeanWrapperFactory factory, Map<String,Object> beanMap, Object bean) Fill up a java bean with the contents of a map where the keys are property names.
static void	getBeanFromMap(Map<String,Object> beanMap, Object bean) Fill up a java bean with the contents of a map where the keys are property names.
static Class<?>	getClass(Type type) Get the underlying class for a type, or null if the type is a variable type.
static Map<String,Object>	getMapFromBean(BeanWrapperFactory factory, Object bean) Transform a Java bean into a Map where the keys are the property names.
static Map<String,Object>	getMapFromBean(Object bean) Transform a Java bean into a Map where the keys are the property names.
static <T> List<Class<?>>	getTypeArguments(Class<T> baseClass, Class<? extends T> childClass) Get the actual type arguments a child class has used to extend a generic base class.
static <T> Map<TypeVariable<?>,Type>	getTypeArgumentsMap(Class<T> baseClass, Class<? extends T> childClass) Get the type parameters and the corresponding actual type arguments a child class has used to extend a generic base class.
static boolean	isSimpleType(Type type) Checks whether a type is a simple java type.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionUtil

public ReflectionUtil()

Method Detail

getClass

public static Class<?> getClass(Type type)

Get the underlying class for a type, or null if the type is a variable type.

Parameters:

type - the type

Returns:

the underlying class

getTypeArguments

public static <T> List<Class<?>> getTypeArguments(Class<T> baseClass,
                                  Class<? extends T> childClass)

Get the actual type arguments a child class has used to extend a generic base class.

Parameters:

baseClass - the base class

childClass - the child class

Returns:

a list of the raw classes for the actual type arguments.

getTypeArgumentsMap

public static <T> Map<TypeVariable<?>,Type> getTypeArgumentsMap(Class<T> baseClass,
                                                Class<? extends T> childClass)

Get the type parameters and the corresponding actual type arguments a child class has used to extend a generic base class.

Parameters:

baseClass - the base class

childClass - the child class

Returns:

A map where the keys are TypeVariable (the type variables declared by the generic declaration) and the values are the Type objects representing the actual type argument the corresponds.

isSimpleType

public static boolean isSimpleType(Type type)

Checks whether a type is a simple java type.

Simple java types are primitives, classes included in the "java" package, Interfaces and Enumerations. Simple java types cannot be java beans, so if this method returns true, you cannot create a BeanWrapper around the specified type.

Parameters:

type - the type to test

Returns:

true if is a simple java type (is not a bean); false if it is not a simple type (may still not be a bean).

getMapFromBean

public static Map<String,Object> getMapFromBean(Object bean)

Transform a Java bean into a Map where the keys are the property names.

If there are nested beans, then the key will be the path of property names in the form "prop1.prop2.prop2".
Properties with null values are not put in the map.

Parameters:

bean - The bean to transform

Returns:

a Map with keys and values corresponding to the bean.

See Also:

#getMapFromBean(BeanWrapperFactory factory, Object bean)} for increased performance.

getMapFromBean

public static Map<String,Object> getMapFromBean(BeanWrapperFactory factory,
                                Object bean)

Transform a Java bean into a Map where the keys are the property names.

If there are nested beans, then the key will be the path of property names in the form "prop1.prop2.prop2".
Properties with null values are not put in the map.

Parameters:

factory - a BeanWrapperFactory instance to cache introspection information. Increases performance if re-used.

bean - The bean to transform

Returns:

a Map with keys and values corresponding to the bean.

See Also:

#getBeanFromMap(BeanWrapperFactory, Map, Object)}

getBeanFromMap

public static void getBeanFromMap(Map<String,Object> beanMap,
                  Object bean)

Fill up a java bean with the contents of a map where the keys are property names.

Parameters:

beanMap - Map with property names and values

bean - bean instance to fill up

See Also:

#getBeanFromMap(BeanWrapperFactory, Map, Object)} for increased performance.

getBeanFromMap

public static void getBeanFromMap(BeanWrapperFactory factory,
                  Map<String,Object> beanMap,
                  Object bean)

Fill up a java bean with the contents of a map where the keys are property names.

Parameters:

factory - a BeanWrapperFactory instance to cache introspection information. Increases performance if re-used.

beanMap - Map with property names and values

bean - bean instance to fill up