com.jgoodies.binding.extras
Class NonNullValueModel
java.lang.Object
AbstractBean
com.jgoodies.binding.beans.Model
com.jgoodies.binding.value.AbstractValueModel
com.jgoodies.binding.extras.NonNullValueModel
- All Implemented Interfaces:
- Observable, ValueModel
public final class NonNullValueModel
- extends AbstractValueModel
A ValueModel
implementation that avoids null
values.
It wraps another ValueModel and returns a (non-null) default value
if the wrapped ValueModel returns null.
Note that value change events fired by this model may use null
as old and/or new value. This is because PropertyChangeEvents use null
to indicate that the old and/or new value is not provided by the event.
Note: This class is not yet part of the binary Binding
library; it comes with the Binding distributions as an extra.
The API is work in progress and may change without notice;
this class may even be completely removed from future distributions.
If you want to use this class, you may consider copying it into
your code base.
- Since:
- 1.1
- Version:
- $Revision: 1.10 $
- Author:
- Karsten Lentzsch
Constructor Summary |
NonNullValueModel(ValueModel subject,
java.lang.Object defaultValue)
Constructs an NonNullValueModel for the given ValueModel. |
Method Summary |
java.lang.Object |
getValue()
Returns this model's current subject value. |
void |
setValue(java.lang.Object newValue)
Sets the given value to the wrapped ValueModel. |
Methods inherited from class com.jgoodies.binding.value.AbstractValueModel |
addValueChangeListener, booleanValue, doubleValue, fireValueChange, fireValueChange, fireValueChange, fireValueChange, fireValueChange, fireValueChange, fireValueChange, floatValue, getString, intValue, longValue, paramString, removeValueChangeListener, setValue, setValue, setValue, setValue, setValue, toString, valueString |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
NonNullValueModel
public NonNullValueModel(ValueModel subject,
java.lang.Object defaultValue)
- Constructs an NonNullValueModel for the given ValueModel.
- Parameters:
subject
- the underlying (or wrapped) ValueModeldefaultValue
- the value used whenever the wrapped model
returns null
- Throws:
java.lang.NullPointerException
- if the subject or defaultValue is null
getValue
public java.lang.Object getValue()
- Returns this model's current subject value.
- Returns:
- this model's current subject value.
setValue
public void setValue(java.lang.Object newValue)
- Sets the given value to the wrapped ValueModel.
The value set can be
null
.
- Parameters:
newValue
- the value to set
Copyright © 2002-2010 JGoodies Karsten Lentzsch. All Rights Reserved.