org.nuiton.util

Class ReflectUtil

java.lang.Object

org.nuiton.util.ReflectUtil

public class ReflectUtil
extends Object

Introspection sur une classe. Détermine si un attribut est constant, recherche de constantes d'un type donné, conversion d'une classe en Enum... Created: 30 décembre 2007

Author:

Tony Chemit - chemit@codelutin.com

Constructor Summary

Constructors

Constructor and Description
ReflectUtil()

Method Summary

Modifier and Type	Method and Description
static Class<?>	boxType(Class<?> type) Obtain the boxed type of any incoming type.
static Set<Field>	getAllDeclaredFields(Class<?> objectClass) Obtain all the declared fields of the given objectClass with a deep scan inside super classes and interfaces.
protected static void	getAllDeclaredFields(Class<?> objectClass, Set<Class<?>> visitedClasses, Set<Field> result)
static Set<Method>	getAllDeclaredMethods(Class<?> objectClass) Obtain all the declared methods of the given objectClass with a deep scan inside super classes and interfaces.
protected static void	getAllDeclaredMethods(Class<?> objectClass, Set<Class<?>> visitedClasses, Set<Method> result)
static <T> T	getConstant(Class<?> klass, String fieldName)
static <T> List<T>	getConstants(Class<?> klass, Class<T> searchingClass) Recherche dans une classe donnée klazz, les constantes d'un certain type searchingClass et les retourne.
static Method	getDeclaredMethod(Class<?> klass, String methodName, boolean strict, Object... arguments) Cherche une methode selon son nom et ses paramètres d'invocation.
protected static Method	getDeclaredMethod(Class<?> klass, String methodName, Set<Class<?>> visitedClasses, Object... arguments)
static <T extends Enum<T>> Class<T>	getEnumClass(Class<?> type) Convertit une classe non typée, en une classe d'enum
static <A extends Annotation> Map<Field,A>	getFieldAnnotation(Class<?> objectClass, Class<A> annotationClass) Obtain all the fields with the given annotation type.
static <A extends Annotation> Map<Field,A>	getFieldAnnotation(Class<?> objectClass, Class<A> annotationClass, boolean deepVisit) Obtain all the fields with the given annotation type.
protected static <A extends Annotation> void	getFieldAnnotation(Class<?> objectClass, Class<A> annotationClass, boolean deepVisit, Set<Class<?>> visitedClasses, Map<Field,A> result)
static <A extends Annotation> Map<Method,A>	getMethodAnnotation(Class<?> objectClass, Class<A> annotationClass) Obtain all the methods with the given annotation type.
static <A extends Annotation> Map<Method,A>	getMethodAnnotation(Class<?> objectClass, Class<A> annotationClass, boolean deepVisit) Obtain all the methods with the given annotation type.
protected static <A extends Annotation> void	getMethodAnnotation(Class<?> objectClass, Class<A> annotationClass, boolean deepVisit, Set<Class<?>> visitedClasses, Map<Method,A> result)
static boolean	isConstantField(Field field) Pour déterminer si un champ d'une classe est une constante (modifiers sont static, final et public)
static Class<?>	unboxType(Class<?> type) Obtain the unboxed type of any incoming type.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectUtil

public ReflectUtil()

Method Detail

isConstantField

public static boolean isConstantField(Field field)

Pour déterminer si un champ d'une classe est une constante (modifiers sont static, final et public)

Parameters:

field - le champs à tester

Returns:

true si les modifiers sont final, static et public

getConstants

public static <T> List<T> getConstants(Class<?> klass,
                                       Class<T> searchingClass)

Recherche dans une classe donnée klazz, les constantes d'un certain type searchingClass et les retourne. L'algorithme parcourt aussi les superclasses.

Type Parameters:

T - enumeration's type

Parameters:

klass - la classe contenant les constantes

searchingClass - le type des champs constants à récupérer

Returns:

la liste des champs du type requis dans

Throws:

RuntimeException - si problème lors de la récupération

getConstant

public static <T> T getConstant(Class<?> klass,
                                String fieldName)

Type Parameters:

T - enumeration's type

Parameters:

klass - the required class

fieldName - the required constant name

Returns:

the constant value

getEnumClass

public static <T extends Enum<T>> Class<T> getEnumClass(Class<?> type)
                                                 throws IllegalArgumentException

Convertit une classe non typée, en une classe d'enum

Type Parameters:

T - enumeration's type

Parameters:

type - la classe a typer

Returns:

la classe typee

Throws:

IllegalArgumentException - si le type est null ou non une extension de la classe Enum.

getDeclaredMethod

public static Method getDeclaredMethod(Class<?> klass,
                                       String methodName,
                                       boolean strict,
                                       Object... arguments)
                                throws IllegalArgumentException

Cherche une methode selon son nom et ses paramètres d'invocation.

Parameters:

klass - la classe dans laquelle rechercher la méthode

methodName - le nom de la méthode recherchée

strict - un drapeau pour déclancher une exception si la méthode n'est pas trouvée

arguments - les arguments d'invocation de la méthode

Returns:

la méthode trouvée

Throws:

IllegalArgumentException - si la méthode n'est pas trouvée et que le drapeau strict est à true

Since:

1.3.1

boxType

public static Class<?> boxType(Class<?> type)

Obtain the boxed type of any incoming type. If incoming type is not a primitive type, then just returns himself.

Parameters:

type - the type to box

Returns:

the boxed type

Since:

1.3.1

See Also:

Class.isPrimitive()

unboxType

public static Class<?> unboxType(Class<?> type)

Obtain the unboxed type of any incoming type. If incoming type is a primitive type, then just returns himself.

Parameters:

type - the type to unbox

Returns:

the unboxed type

Since:

1.3.1

See Also:

Class.isPrimitive()

getAllDeclaredFields

public static Set<Field> getAllDeclaredFields(Class<?> objectClass)

Obtain all the declared fields of the given objectClass with a deep scan inside super classes and interfaces. Note: The type Object will not be scanned.

Parameters:

objectClass - the object class to scan

Returns:

the set of all declared fields found

Since:

2.0

getAllDeclaredMethods

public static Set<Method> getAllDeclaredMethods(Class<?> objectClass)

Obtain all the declared methods of the given objectClass with a deep scan inside super classes and interfaces. Note: The type Object will not be scanned.

Parameters:

objectClass - the object class to scan

Returns:

the set of all declared methods found

Since:

2.0

getFieldAnnotation

public static <A extends Annotation> Map<Field,A> getFieldAnnotation(Class<?> objectClass,
                                                                     Class<A> annotationClass)

Obtain all the fields with the given annotation type. Note: This method will not scan deeply the given type (no scan of super-classes nor interfaces).

Type Parameters:

A - type of annotation to scan

Parameters:

objectClass - the type to scan

annotationClass - the type of annotation to scan

Returns:

the dictionnary of fields with the given annotation

Since:

2.0

getFieldAnnotation

public static <A extends Annotation> Map<Field,A> getFieldAnnotation(Class<?> objectClass,
                                                                     Class<A> annotationClass,
                                                                     boolean deepVisit)

Obtain all the fields with the given annotation type. Note: This method will scan deeply the given type if parameter deepVisit is setted to true. Note: The type Object will not be scanned.

Type Parameters:

A - type of annotation to scan

Parameters:

objectClass - the type to scan

annotationClass - the type of annotation to scan

deepVisit - flag to visit deeply the class (if set to true, will also scan super classes and interfaces)

Returns:

the dictionnary of fields with the given annotation

Since:

2.0

getMethodAnnotation

public static <A extends Annotation> Map<Method,A> getMethodAnnotation(Class<?> objectClass,
                                                                       Class<A> annotationClass)

Obtain all the methods with the given annotation type. Note: This method will not scan deeply the given type (no scan of super-classes nor interfaces).

Type Parameters:

A - type of annotation to scan

Parameters:

objectClass - the type to scan

annotationClass - the type of annotation to scan

Returns:

the dictionnary of methods with the given annotation

Since:

2.0

getMethodAnnotation

public static <A extends Annotation> Map<Method,A> getMethodAnnotation(Class<?> objectClass,
                                                                       Class<A> annotationClass,
                                                                       boolean deepVisit)

Obtain all the methods with the given annotation type. Note: This method will scan deeply the given type if parameter deepVisit is setted to true. Note: The type Object will not be scanned.

Type Parameters:

A - type of annotation to scan

Parameters:

objectClass - the type to scan

annotationClass - the type of annotation to scan

deepVisit - flag to visit deeply the class (if set to true, will also scan super classes and interfaces)

Returns:

the dictionnary of methods with the given annotation

Since:

2.0

getDeclaredMethod

protected static Method getDeclaredMethod(Class<?> klass,
                                          String methodName,
                                          Set<Class<?>> visitedClasses,
                                          Object... arguments)

getAllDeclaredFields

protected static void getAllDeclaredFields(Class<?> objectClass,
                                           Set<Class<?>> visitedClasses,
                                           Set<Field> result)

getAllDeclaredMethods

protected static void getAllDeclaredMethods(Class<?> objectClass,
                                            Set<Class<?>> visitedClasses,
                                            Set<Method> result)

getFieldAnnotation

protected static <A extends Annotation> void getFieldAnnotation(Class<?> objectClass,
                                                                Class<A> annotationClass,
                                                                boolean deepVisit,
                                                                Set<Class<?>> visitedClasses,
                                                                Map<Field,A> result)

getMethodAnnotation

protected static <A extends Annotation> void getMethodAnnotation(Class<?> objectClass,
                                                                 Class<A> annotationClass,
                                                                 boolean deepVisit,
                                                                 Set<Class<?>> visitedClasses,
                                                                 Map<Method,A> result)