Module seppiko.commons.utils

Package org.seppiko.commons.utils.reflect

Class ReflectionUtil

java.lang.Object

org.seppiko.commons.utils.reflect.ReflectionUtil

public class ReflectionUtil
extends Object

Reflection Util

Author:

Leonard Woo

Constructor Summary

Constructors

Constructor	Description
ReflectionUtil()

Method Summary

Modifier and Type	Method	Description
static Field	findField(Class<?> clazz, String name, Class<?> type)	find field with type
static <T> Method	findMethod(Class<T> clazz, String methodName)	find method
static <T> Method	findMethod(Class<T> clazz, String methodName, Class<?>... parameterTypes)	find a method with parameter types
static Method[]	getAllDeclaredMethods(Class<?> clazz)	get methods
static Field[]	getDeclaredFields(Class<?> clazz)	get all fields
static Method[]	getDeclaredMethods(Class<?> clazz)	get methods
static <T> Object	getField(Field field, T target)	get field value
static Parameter[]	getParameters(Method method)	get method parameters
static Class<?>[]	getParameterTypes(Object[] args)	get parameters type
static Object	invokeMethod(Method method, Object target)	invoke method without parameter
static Object	invokeMethod(Method method, Object target, Object... args)	invoke method on target instance
static <T> Object	invokeMethod(T t, String methodName, Class<?>[] parameterTypes, Object... args)	class instance method caller
static <T> Object	invokeMethod(T t, String methodName, Object... args)	class instance method caller
static <T> T	newInstance(Class<T> clazz)	get class instance without parameter
static <T> T	newInstance(Class<T> clazz, Class<?>[] parameterTypes, Object[] initArgs)	get class instance with parameter
static <T, V> void	setField(Field field, T target, V value)	set field value

Methods inherited from class java.lang.Object

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

Constructor Details

ReflectionUtil

public ReflectionUtil()

Method Details

newInstance

public static <T> T newInstance(Class<T> clazz)
                         throws NoSuchMethodException,
IllegalAccessException,
InvocationTargetException,
InstantiationException

get class instance without parameter

Type Parameters:

T - target class type

Parameters:

clazz - target class

Returns:

class instance

Throws:

NoSuchMethodException - not found constructor method

IllegalAccessException - can not access constructor method

InvocationTargetException - can not call constructor method

InstantiationException - can not instance

newInstance

public static <T> T newInstance(Class<T> clazz,
 Class<?>[] parameterTypes,
 Object[] initArgs)
                         throws NoSuchMethodException,
IllegalAccessException,
InvocationTargetException,
InstantiationException

get class instance with parameter

Type Parameters:

T - target class type

Parameters:

clazz - target class

parameterTypes - class constructor parameter types

initArgs - class constructor parameter objects

Returns:

class instance

Throws:

NoSuchMethodException - not found constructor method

IllegalAccessException - can not access constructor method

InvocationTargetException - can not call constructor method

InstantiationException - can not instance

findMethod

public static <T> Method findMethod(Class<T> clazz,
 String methodName)
                             throws NoSuchMethodException,
SecurityException

find method

Type Parameters:

T - class type

Parameters:

clazz - method class

methodName - method name

Returns:

method object

Throws:

NoSuchMethodException - not found method

SecurityException - access failed

findMethod

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

find a method with parameter types

Type Parameters:

T - class type

Parameters:

clazz - method class

methodName - method name

parameterTypes - parameter types

Returns:

method object

Throws:

NoSuchMethodException - not found method

SecurityException - access failed

invokeMethod

public static <T> Object invokeMethod(T t,
 String methodName,
 Object... args)
                               throws ReflectiveOperationException,
RuntimeException

class instance method caller

Type Parameters:

T - target class

Parameters:

t - target class instance

methodName - call method name

args - parameter objects (can NOT use basic data types, cause nonsupport auto unboxing)

Returns:

method return object

Throws:

ReflectiveOperationException - can NOT found method or can NOT access method

RuntimeException - method or parameter exception

invokeMethod

public static <T> Object invokeMethod(T t,
 String methodName,
 Class<?>[] parameterTypes,
 Object... args)
                               throws ReflectiveOperationException,
RuntimeException

class instance method caller

Type Parameters:

T - target class

Parameters:

t - target class instance

methodName - call method name

parameterTypes - parameter types

args - parameter objects

Returns:

method return object

Throws:

ReflectiveOperationException - can NOT found method or can NOT access method

RuntimeException - method or parameter exception

getParameterTypes

public static Class<?>[] getParameterTypes(Object[] args)

get parameters type

Parameters:

args - data type objects

Returns:

get object types

invokeMethod

public static Object invokeMethod(Method method,
 Object target,
 Object... args)
                           throws InvocationTargetException,
IllegalAccessException,
IllegalArgumentException

invoke method on target instance

Parameters:

method - target method

target - target class instance

args - method parameters

Returns:

method return object (if exist)

Throws:

InvocationTargetException - method throws an exception

IllegalAccessException - method can not access

IllegalArgumentException - method parameter type or size exception

invokeMethod

public static Object invokeMethod(Method method,
 Object target)
                           throws InvocationTargetException,
IllegalAccessException,
IllegalArgumentException

invoke method without parameter

Parameters:

method - target method

target - target class instance

Returns:

method return object (if exist)

Throws:

InvocationTargetException - method throws an exception

IllegalAccessException - method can not access

IllegalArgumentException - method parameter type or size exception

getDeclaredMethods

public static Method[] getDeclaredMethods(Class<?> clazz)
                                   throws SecurityException

get methods

Parameters:

clazz - target class

Returns:

methods

Throws:

SecurityException - can not access method or some else

getAllDeclaredMethods

public static Method[] getAllDeclaredMethods(Class<?> clazz)
                                      throws SecurityException,
IllegalAccessException

get methods

Parameters:

clazz - target class

Returns:

methods

Throws:

SecurityException - can not access method or some else

IllegalAccessException - method can not access

findField

public static Field findField(Class<?> clazz,
 String name,
 Class<?> type)
                       throws NoSuchFieldException

find field with type

Parameters:

clazz - target class

name - field name

type - field type

Returns:

field object

Throws:

NoSuchFieldException - not found field

getDeclaredFields

public static Field[] getDeclaredFields(Class<?> clazz)
                                 throws SecurityException

get all fields

Parameters:

clazz - target class

Returns:

fields

Throws:

SecurityException - field security

getField

public static <T> Object getField(Field field,
 T target)
                           throws IllegalArgumentException,
IllegalAccessException

get field value

Type Parameters:

T - field name type

Parameters:

field - target class field

target - field name

Returns:

target field value

Throws:

IllegalArgumentException - field not exist

IllegalAccessException - field access failed

setField

public static <T,
V> void setField(Field field,
 T target,
 V value)
                           throws IllegalArgumentException,
IllegalAccessException

set field value

Type Parameters:

T - field name type

V - field value type

Parameters:

field - target class field

target - field name

value - field value

Throws:

IllegalArgumentException - field not exist

IllegalAccessException - field access failed

getParameters

public static Parameter[] getParameters(Method method)

get method parameters

Parameters:

method - target method object

Returns:

parameters