Package org.infinispan.commons.util

Class ReflectionUtil

java.lang.Object

org.infinispan.commons.util.ReflectionUtil

public class ReflectionUtil
extends Object

Basic reflection utilities to enhance what the JDK provides.

Since:

4.0

Author:

Manik Surtani (manik@jboss.org)

Field Summary

Fields

Modifier and Type	Field	Description
static Class<?>[]	EMPTY_CLASS_ARRAY

Constructor Summary

Constructors

Constructor	Description
ReflectionUtil()

Method Summary

Modifier and Type	Method	Description
static String	extractFieldName(String setterOrGetter)
static Method	findGetterForField(Class<?> c, String fieldName)
static Method	findMethod(Class<?> type, String methodName)
static Method	findMethod(Class<?> type, String methodName, Class<?>... parameters)
static Method	findSetterForField(Class<?> c, String fieldName)
static List<Field>	getAllFields(Class<?> c, Class<? extends Annotation> annotationType)
static List<Method>	getAllMethods(Class<?> c, Class<? extends Annotation> annotationType)	Returns a set of Methods that contain the given method annotation.
static List<Method>	getAllMethodsShallow(Class<?> c, Class<? extends Annotation> annotationType)	Returns a set of Methods that contain the given method annotation.
static List<Field>	getAnnotatedFields(Class<?> c, Class<? extends Annotation> annotationType)
static <T extends Annotation> T	getAnnotation(Class<?> clazz, Class<T> ann)	Inspects the class passed in for the class level annotation specified.
static Class<?>	getClassForName(String name, ClassLoader cl)
static Field	getField(String fieldName, Class<?> objectClass)
static int	getIntAccessibly(Field f, Object instance)
static Object	getValue(Object instance, String fieldName)	Retrieves the value of a field of an object instance via reflection
static Object	invokeAccessibly(Object instance, Method method, Object... parameters)	Invokes a method using reflection, in an accessible manner (by using AccessibleObject.setAccessible(boolean)
static Object	invokeMethod(Object instance, Method method, Object[] parameters)
static boolean	isAnnotationPresent(Class<?> clazz, Class<? extends Annotation> annotation)	Tests whether an annotation is present on a class.
static void	setAccessibly(Object instance, Field field, Object value)
static void	setField(Object instance, Field field, Object value)
static Class<?>[]	toClassArray(String[] typeList, ClassLoader classLoader)
static String[]	toStringArray(Class<?>[] classes)
static <T> T	unwrap(Object obj, Class<T> clazz)
static <T> T	unwrapAny(Class<T> clazz, Object... objs)

Field Detail

EMPTY_CLASS_ARRAY

public static final Class<?>[] EMPTY_CLASS_ARRAY

Constructor Detail

ReflectionUtil

public ReflectionUtil()

Method Detail

getAllMethods

public static List<Method> getAllMethods(Class<?> c,
                                         Class<? extends Annotation> annotationType)

Returns a set of Methods that contain the given method annotation. This includes all public, protected, package and private methods, as well as those of superclasses. Note that this does *not* include overridden methods.

Parameters:

c - class to inspect

annotationType - the type of annotation to look for

Returns:

List of Method objects that require injection.

getAllMethodsShallow

public static List<Method> getAllMethodsShallow(Class<?> c,
                                                Class<? extends Annotation> annotationType)

Returns a set of Methods that contain the given method annotation. This includes all public, protected, package and private methods, but not those of superclasses and interfaces.

Parameters:

c - class to inspect

annotationType - the type of annotation to look for

Returns:

List of Method objects that require injection.

getAllFields

public static List<Field> getAllFields(Class<?> c,
                                       Class<? extends Annotation> annotationType)

getAnnotatedFields

public static List<Field> getAnnotatedFields(Class<?> c,
                                             Class<? extends Annotation> annotationType)

findMethod

public static Method findMethod(Class<?> type,
                                String methodName)

findMethod

public static Method findMethod(Class<?> type,
                                String methodName,
                                Class<?>... parameters)

invokeAccessibly

public static Object invokeAccessibly(Object instance,
                                      Method method,
                                      Object... parameters)

Invokes a method using reflection, in an accessible manner (by using AccessibleObject.setAccessible(boolean)

Parameters:

instance - instance on which to execute the method

method - method to execute

parameters - parameters

invokeMethod

public static Object invokeMethod(Object instance,
                                  Method method,
                                  Object[] parameters)

setAccessibly

public static void setAccessibly(Object instance,
                                 Field field,
                                 Object value)

setField

public static void setField(Object instance,
                            Field field,
                            Object value)

findGetterForField

public static Method findGetterForField(Class<?> c,
                                        String fieldName)

findSetterForField

public static Method findSetterForField(Class<?> c,
                                        String fieldName)

extractFieldName

public static String extractFieldName(String setterOrGetter)

getValue

public static Object getValue(Object instance,
                              String fieldName)

Retrieves the value of a field of an object instance via reflection

Parameters:

instance - to inspect

fieldName - name of field to retrieve

Returns:

a value

getAnnotation

public static <T extends Annotation> T getAnnotation(Class<?> clazz,
                                                     Class<T> ann)

Inspects the class passed in for the class level annotation specified. If the annotation is not available, this method recursively inspects superclasses and interfaces until it finds the required annotation.

Returns null if the annotation cannot be found.

Parameters:

clazz - class to inspect

ann - annotation to search for. Must be a class-level annotation.

Returns:

the annotation instance, or null

isAnnotationPresent

public static boolean isAnnotationPresent(Class<?> clazz,
                                          Class<? extends Annotation> annotation)

Tests whether an annotation is present on a class. The order tested is:

• The class itself
• All implemented interfaces
• Any superclasses

Parameters:

clazz - class to test

annotation - annotation to look for

Returns:

true if the annotation is found, false otherwise

toClassArray

public static Class<?>[] toClassArray(String[] typeList,
                                      ClassLoader classLoader)
                               throws ClassNotFoundException

Throws:

ClassNotFoundException

getClassForName

public static Class<?> getClassForName(String name,
                                       ClassLoader cl)
                                throws ClassNotFoundException

Throws:

ClassNotFoundException

toStringArray

public static String[] toStringArray(Class<?>[] classes)

getField

public static Field getField(String fieldName,
                             Class<?> objectClass)

unwrap

public static <T> T unwrap(Object obj,
                           Class<T> clazz)

unwrapAny

public static <T> T unwrapAny(Class<T> clazz,
                              Object... objs)

getIntAccessibly

public static int getIntAccessibly(Field f,
                                   Object instance)