org.perfectjpattern.core.api.behavioral.command
Class NullParameter

java.lang.Object
  org.perfectjpattern.core.api.behavioral.command.NullParameter

All Implemented Interfaces:

ISingleton

public final class NullParameter
extends Object
implements ISingleton

Null Object Pattern implementation of Command Parameter. Prevents different Command implementations from pushing null into the Receiver's execute method.

NullParameter is a Singleton therefore it can not be directly instantiated, neither it may be extended.

Version:

$Revision: 1.0 $ $Date: Jun 19, 2007 10:17:38 PM $

Author:

Giovanni Azua

Method Summary

static NullParameter

getInstance() Returns Singleton instance of NullParameter.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static NullParameter getInstance()

Returns Singleton instance of NullParameter.

Returns:

Singleton instance of NullParameter.