org.needle4j.reflection

Class ReflectionUtil

java.lang.Object

org.needle4j.reflection.ReflectionUtil

public final class ReflectionUtil
extends Object

Method Summary

Methods

Modifier and Type	Method and Description
static <T> T	createInstance(Class<T> clazz, Object... parameter)
static Class<?>	forName(String className) Returns the Class object associated with the class or interface with the given string name.
static Map<Class<? extends Annotation>,List<Field>>	getAllAnnotatedFields(Class<?> clazz)
static List<Field>	getAllFields(Class<?> clazz)
static List<Field>	getAllFieldsAssignableFrom(Class<?> assignableType, Class<?> clazz)
static List<Field>	getAllFieldsAssinableFrom(Class<?> assinableType, Class<?> clazz) Deprecated. typo
static List<Field>	getAllFieldsWithAnnotation(Class<?> clazz, Class<? extends Annotation> annotation)
static List<Field>	getAllFieldsWithAnnotation(Object instance, Class<? extends Annotation> annotation)
static List<Field>	getAllFieldsWithSupportedAnnotation(Class<?> clazz, IsSupportedAnnotationPredicate isSupportedAnnotationPredicate)
static List<Method>	getAllMethodsWithAnnotation(Class<?> clazz, Class<? extends Annotation> annotation)
static Set<Class<?>>	getClasses(String... classNames)
static Field	getField(Class<?> clazz, String fieldName)
static Object	getFieldValue(Object object, Class<?> clazz, String fieldName) Get the value of a given field on a given object via reflection.
static Object	getFieldValue(Object object, Field field) Get the value of a given field on a given object via reflection.
static Object	getFieldValue(Object object, String fieldName) Get the value of a given field on a given object via reflection.
static Method	getMethod(Class<?> clazz, String methodName, Class<?>... parameterTypes)
static List<Method>	getMethods(Class<?> clazz)
static Object	invokeMethod(Method method, Object instance, Object... arguments)
static Object	invokeMethod(Object object, Class<?> clazz, String methodName, Object... arguments) Invoke a given method with given arguments on a given object via reflection.
static Object	invokeMethod(Object object, String methodName, Object... arguments) Invoke a given method with given arguments on a given object via reflection.
static <T> Class<T>	lookupClass(Class<T> type, String className)
static void	setField(Field field, Object target, Object value)
static void	setField(String fieldName, Object target, Object value)
static void	setFieldValue(Object object, Class<?> clazz, String fieldName, Object value) Changing the value of a given field.
static void	setFieldValue(Object object, String fieldName, Object value) Changing the value of a given field.

Methods inherited from class java.lang.Object

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

Method Detail

getAllFieldsWithSupportedAnnotation

public static List<Field> getAllFieldsWithSupportedAnnotation(Class<?> clazz,
                                              IsSupportedAnnotationPredicate isSupportedAnnotationPredicate)

getAllFieldsWithAnnotation

public static List<Field> getAllFieldsWithAnnotation(Class<?> clazz,
                                     Class<? extends Annotation> annotation)

getAllMethodsWithAnnotation

public static List<Method> getAllMethodsWithAnnotation(Class<?> clazz,
                                       Class<? extends Annotation> annotation)

getAllAnnotatedFields

public static Map<Class<? extends Annotation>,List<Field>> getAllAnnotatedFields(Class<?> clazz)

getAllFieldsAssignableFrom

public static List<Field> getAllFieldsAssignableFrom(Class<?> assignableType,
                                     Class<?> clazz)

getAllFieldsAssinableFrom

@Deprecated
public static List<Field> getAllFieldsAssinableFrom(Class<?> assinableType,
                                               Class<?> clazz)

Deprecated. typo

See Also:

getAllFieldsAssignableFrom(Class, Class)

getAllFieldsWithAnnotation

public static List<Field> getAllFieldsWithAnnotation(Object instance,
                                     Class<? extends Annotation> annotation)

getAllFields

public static List<Field> getAllFields(Class<?> clazz)

getMethods

public static List<Method> getMethods(Class<?> clazz)

Parameters:

clazz - object

Returns:

list of method objects

See Also:

Class.getMethods()

setFieldValue

public static void setFieldValue(Object object,
                 Class<?> clazz,
                 String fieldName,
                 Object value)
                          throws NoSuchFieldException

Changing the value of a given field.

Parameters:

object - -- target object of injection

clazz - -- type of argument object

fieldName - -- name of field whose value is to be set

value - -- object that is injected

Throws:

NoSuchFieldException

setFieldValue

public static void setFieldValue(Object object,
                 String fieldName,
                 Object value)

Changing the value of a given field.

Parameters:

object - -- target object of injection

fieldName - -- name of field whose value is to be set

value - -- object that is injected

getFieldValue

public static Object getFieldValue(Object object,
                   Class<?> clazz,
                   String fieldName)

Get the value of a given field on a given object via reflection.

Parameters:

object - -- target object of field access

clazz - -- type of argument object

fieldName - -- name of the field

Returns:

-- the value of the represented field in object; primitive values are wrapped in an appropriate object before being returned

getFieldValue

public static Object getFieldValue(Object object,
                   Field field)

Get the value of a given field on a given object via reflection.

Parameters:

object - -- target object of field access

field - -- target field

Returns:

-- the value of the represented field in object; primitive values are wrapped in an appropriate object before being returned

getFieldValue

public static Object getFieldValue(Object object,
                   String fieldName)

Get the value of a given field on a given object via reflection.

Parameters:

object - -- target object of field access

fieldName - -- name of the field

Returns:

-- the value of the represented field in object; primitive values are wrapped in an appropriate object before being returned

invokeMethod

public static Object invokeMethod(Object object,
                  Class<?> clazz,
                  String methodName,
                  Object... arguments)
                           throws Exception

Invoke a given method with given arguments on a given object via reflection.

Parameters:

object - -- target object of invocation

clazz - -- type of argument object

methodName - -- name of method to be invoked

arguments - -- arguments for method invocation

Returns:

-- method object to which invocation is actually dispatched

Throws:

Exception - - operation exception

invokeMethod

public static Object invokeMethod(Method method,
                  Object instance,
                  Object... arguments)
                           throws Exception

Throws:

Exception

getMethod

public static Method getMethod(Class<?> clazz,
               String methodName,
               Class<?>... parameterTypes)
                        throws NoSuchMethodException

Throws:

NoSuchMethodException

invokeMethod

public static Object invokeMethod(Object object,
                  String methodName,
                  Object... arguments)
                           throws Exception

Invoke a given method with given arguments on a given object via reflection.

Parameters:

object - -- target object of invocation

methodName - -- name of method to be invoked

arguments - -- arguments for method invocation

Returns:

-- method object to which invocation is actually dispatched

Throws:

Exception

getClasses

public static Set<Class<?>> getClasses(String... classNames)

forName

public static Class<?> forName(String className)

Returns the Class object associated with the class or interface with the given string name.

Parameters:

className - the fully qualified name of the desired class.

Returns:

Class or null

setField

public static void setField(Field field,
            Object target,
            Object value)
                     throws Exception

Throws:

Exception

setField

public static void setField(String fieldName,
            Object target,
            Object value)
                     throws Exception

Throws:

Exception

getField

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

createInstance

public static <T> T createInstance(Class<T> clazz,
                   Object... parameter)
                        throws Exception

Throws:

Exception

lookupClass

public static <T> Class<T> lookupClass(Class<T> type,
                       String className)
                            throws ClassNotFoundException

Parameters:

type - - base class

className - - fully qualified class name

Returns:

class object

Throws:

ClassNotFoundException