Package com.pnfsoftware.jeb.util.reflect

Class ReflectionHelper

java.lang.Object

com.pnfsoftware.jeb.util.reflect.ReflectionHelper

public class ReflectionHelper
extends Object

Helper routines using the Java Reflection API.

Constructor Summary

Constructors

Constructor	Description
ReflectionHelper()

Method Summary

Modifier and Type	Method	Description
static Object	get2(Field f, Object o)
static boolean	hasNoArgConstructor(Class<?> c)
static <T> T	instantiateSafe(Class<? extends T> c)
static Object	invoke2(Method m, Object o, Object... args)
static boolean	isInstance(Object o, Class<?>... classObjects)	A multi-element variant of Class.isInstance(Object).
static <T> boolean	isInstance(Object o, Collection<Class<? extends T>> classObjects)	A multi-element variant of Class.isInstance(Object).
static Object	newInstance2(Constructor<?> constructor)
static Class<?>	reduceDimensions(Class<?> c)	Reduce dimensions of an array type.
static Class<?>	removeDimensions(Class<?> c)	Remove dimensions of an array type.
static void	set2(Field f, Object o, Object value)
static boolean	subtypeOf(Class<?> c, Class<?> parent)	Determine if a type is a descendant of the provided ancestor.

Methods inherited from class java.lang.Object

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

Constructor Details

ReflectionHelper

public ReflectionHelper()

Method Details

hasNoArgConstructor

public static boolean hasNoArgConstructor(Class<?> c)

newInstance2

public static Object newInstance2(Constructor<?> constructor)
                           throws InstantiationException,
IllegalAccessException,
IllegalArgumentException,
InvocationTargetException

Throws:

InstantiationException

IllegalAccessException

IllegalArgumentException

InvocationTargetException

invoke2

public static Object invoke2(Method m,
 Object o,
 Object... args)
                      throws IllegalAccessException,
IllegalArgumentException,
InvocationTargetException

Throws:

IllegalAccessException

IllegalArgumentException

InvocationTargetException

set2

public static void set2(Field f,
 Object o,
 Object value)
                 throws IllegalAccessException,
IllegalArgumentException

Throws:

IllegalAccessException

IllegalArgumentException

get2

public static Object get2(Field f,
 Object o)
                   throws IllegalAccessException,
IllegalArgumentException

Throws:

IllegalAccessException

IllegalArgumentException

removeDimensions

public static Class<?> removeDimensions(Class<?> c)

Remove dimensions of an array type.

• non-array => non-array
• type[]...[] => type

Parameters:

c - a type

Returns:

the dimension-less type

reduceDimensions

public static Class<?> reduceDimensions(Class<?> c)

Reduce dimensions of an array type. Careful, caveat for primitives:

• non-array => non-array
• Object[]...[] => Object
• prim[]...[] => prim[]

Parameters:

c - a type

Returns:

instantiateSafe

public static <T> T instantiateSafe(Class<? extends T> c)

Parameters:

c -

Returns:

isInstance

public static <T> boolean isInstance(Object o,
 Collection<Class<? extends T>> classObjects)

A multi-element variant of Class.isInstance(Object).

Parameters:

o - the object to be tested

classObjects - a collection of Class objects

Returns:

true if o can be cast to one of the provided class objects

isInstance

public static boolean isInstance(Object o,
 Class<?>... classObjects)

A multi-element variant of Class.isInstance(Object).

Parameters:

o - the object to be tested

classObjects - a collection of Class objects

Returns:

true if o can be cast to one of the provided class objects

subtypeOf

public static boolean subtypeOf(Class<?> c,
 Class<?> parent)

Determine if a type is a descendant of the provided ancestor.

Parameters:

c - a type (class or interface)

parent - a candidate ancestor type (class or interface)

Returns:

true or false