de.tsl2.nano.util

Class DelegatorProxy

java.lang.Object

de.tsl2.nano.util.DelegatorProxy

All Implemented Interfaces:

Serializable, InvocationHandler

public class DelegatorProxy
extends Object
implements InvocationHandler, Serializable

generic delegator to be usable as base class for simple delegation implementations. the delegator doesn't have to implement the given interface, but has to provide the desired implementation with a method thats name and arguments have to match the interface method.

if you give more than one delegator, they will be asked in the given order to have the desired method - to invoke it.

if no delegator provides the called method, the standard proxy implementation will be used.

the delegator is also usable as instance extender on runtime.

 example:
     public void setBeanFinder(final IBeanFinder beanFinder) {
         Object internalBeanFinder = new Object() {
             Collection getData(T from, Object to) {
                 collection = (COLLECTIONTYPE) beanFinder.getData(from, to);
                 return collection;
             };
         };
         this.beanFinder = DelegatorProxy.delegator(IBeanFinder.class, internalBeanFinder, beanFinder);
     }
 
 

To work directly on interface implementations, use MultipleInheritanceProxy.

Version:

$Revision$

Author:

Thomas Schneider

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DelegatorProxy(Object... delegators)

Method Summary

Modifier and Type	Method and Description
static Object	delegator(Class[] proxyInterfaces, Object... delegators) delegator
static <T> T	delegator(Class<T> proxyInterface, Object... delegators) delegator
Object	invoke(Object proxy, Method method, Object[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatorProxy

protected DelegatorProxy(Object... delegators)

Method Detail

invoke

public Object invoke(Object proxy,
                     Method method,
                     Object[] args)
              throws Throwable

Specified by:

invoke in interface InvocationHandler

Throws:

Throwable

delegator

public static final <T> T delegator(Class<T> proxyInterface,
                                    Object... delegators)

delegator

Type Parameters:

T -

Parameters:

proxyInterface -

delegators -

Returns:

delegator

public static final Object delegator(Class[] proxyInterfaces,
                                     Object... delegators)

delegator

Type Parameters:

T -

Parameters:

proxyInterfaces -

delegators -

Returns: