net.sf.cuf.model.state

Class NullState

java.lang.Object

net.sf.cuf.state.AbstractState

net.sf.cuf.model.state.NullState

All Implemented Interfaces:

EventListener, ChangeListener, State

public class NullState
extends AbstractState
implements State, ChangeListener

A NullState monitors the value of a ValueModel. Whenever the ValueModel holds null, the state is enabled.

Field Summary

Fields inherited from class net.sf.cuf.state.AbstractState

mIsEnabled, mIsInitialized, mListenerList, mName, mReason

Constructor Summary

Constructors

Constructor and Description
NullState(ValueModel<?> pTrigger) Create a new NullState, the given ValueModel serves as a trigger for this state.

Method Summary

Methods

Modifier and Type	Method and Description
void	stateChanged(ChangeEvent pEvent) Callback if our value model changes.

Methods inherited from class net.sf.cuf.state.AbstractState

addChangeListener, checkDisposed, dispose, fireStateChanged, getChangeReason, getDependents, getName, isDisposed, isEnabled, isInitialized, removeChangeListener, setName, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.cuf.state.State

addChangeListener, dispose, getChangeReason, getDependents, getName, isDisposed, isEnabled, isInitialized, removeChangeListener, setName

Constructor Detail

NullState

public NullState(ValueModel<?> pTrigger)

Create a new NullState, the given ValueModel serves as a trigger for this state.

Parameters:

pTrigger - the ValueModel to be used as a trigger for this state, must not be null. If the value of this ValueModel changes to null or vice versa, the listeners of this state are notified.

Throws:

IllegalArgumentException - if pTrigger is null

Method Detail

stateChanged

public void stateChanged(ChangeEvent pEvent)

Callback if our value model changes.

Specified by:

stateChanged in interface ChangeListener

Parameters:

pEvent - not used