patterntesting.runtime.util
Class ReflectionHelper

java.lang.Object
  patterntesting.runtime.util.ReflectionHelper

public class ReflectionHelper
extends Object

This class is a helper class to access some fields via reflection. Normally you should avoid reflection. Handle with care if you use it.

Since:

09.03.2009

Version:

$Revision: 1.12 $

Author:

oliver

Method Summary

static Field	getField(Class<?> cl, String name) Tries to get the wanted field.
static Object	getFieldValue(Object obj, String name) If it can it returns the value of the given field.
static Method	getMethod(Class<?> cl, String name, Class<?>... parameterTypes) Gets the method.
static Method	getMethod(Class<?> cl, String name, Object... args) Gets the method.
static Collection<Field>	getUninitializedNonStaticFields(Object obj) To get all uninitialized field you can call this method.
static Object	invokeMethod(Object target, String name, Object... args) Invoke method.
static boolean	isStatic(Field field) Checks if the given field is static.
static String	toShortString(Collection<Field> fields) To short string.
static String	toShortString(Field field) To short string.

Methods inherited from class java.lang.Object

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

Method Detail

getField

public static Field getField(Class<?> cl,
                             String name)
                      throws NoSuchFieldException

Tries to get the wanted field. Before it is returned the acc

Parameters:

cl - the cl

name - the name

Returns:

the wanted field

Throws:

NoSuchFieldException - the no such field exception

getFieldValue

public static Object getFieldValue(Object obj,
                                   String name)
                            throws NoSuchFieldException,
                                   IllegalArgumentException,
                                   IllegalAccessException

If it can it returns the value of the given field. If not it throws an exception.

Parameters:

obj - the obj

name - the name

Returns:

the field value

Throws:

NoSuchFieldException - the no such field exception

IllegalArgumentException - the illegal argument exception

IllegalAccessException - the illegal access exception

getUninitializedNonStaticFields

public static Collection<Field> getUninitializedNonStaticFields(Object obj)

To get all uninitialized field you can call this method.

Parameters:

obj - the object where to get the fields from

Returns:

a collecion of unitialized fields (can be empty)

isStatic

public static boolean isStatic(Field field)

Checks if the given field is static.

Parameters:

field - the field

Returns:

true, if is static

toShortString

public static String toShortString(Field field)

To short string.

Parameters:

field - the field

Returns:

the string

toShortString

public static String toShortString(Collection<Field> fields)

To short string.

Parameters:

fields - the fields

Returns:

the string

getMethod

public static Method getMethod(Class<?> cl,
                               String name,
                               Object... args)
                        throws NoSuchMethodException

Gets the method.

Parameters:

cl - the cl

name - the name

args - the args

Returns:

the method

Throws:

NoSuchMethodException - the no such method exception

getMethod

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

Gets the method.

Parameters:

cl - e.g. class java.lang.ClassLoader

name - e.g. "getPackages"

parameterTypes - the parameter types

Returns:

a Method object

Throws:

NoSuchMethodException - the no such method exception

invokeMethod

public static Object invokeMethod(Object target,
                                  String name,
                                  Object... args)

Invoke method. This could be also a protected or private method.

Parameters:

target - the target

name - the method name

args - the args for the method

Returns:

the result of the method.