Java Doc for Trigger.java in  » Swing-Library » jgoodies-data-binding » com » jgoodies » binding » value » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » jgoodies data binding » com.jgoodies.binding.value 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


com.jgoodies.binding.value.AbstractValueModel
   com.jgoodies.binding.value.Trigger

Trigger
final public class Trigger extends AbstractValueModel (Code)
A ValueModel implementation that is intended to be used as trigger channel for instances of BufferedValueModel. API users shall trigger commit and flush events using #triggerCommit and #triggerFlush.

This Trigger class works around an inconvenient situation when using a general ValueHolder as trigger channel of a BufferedValueModel. BufferedValueHolder performs commit and flush events only if the trigger channel value reports a change. And a ValueHolder doesn't report a change if #setValue tries to set the current value. For example if you set Boolean.TRUE twice, the latter doesn't fire a property change event. The methods #triggerCommit and #triggerFlush check for the current state and guarantee that the appropriate PropertyChangeEvent is fired. On the other hand, the implementation minimizes the number of events necessary to commit or flush buffered values.

Constraints: The value is of type Boolean.

The following example delays the commit of a buffered value:

 ValueModel subject = new ValueHolder();
 Trigger trigger = new Trigger();
 BufferedValueModel buffer = new BufferedValueModel(subject, trigger);
 buffer.setValue("value");
 ...
 trigger.triggerCommit();
 

author:
   Karsten Lentzsch
version:
   $Revision: 1.5 $
See Also:   BufferedValueModel



Constructor Summary
public  Trigger()
     Constructs a Trigger set to neutral.

Method Summary
public  ObjectgetValue()
     Returns a Boolean that indicates the current trigger state.
public  voidsetValue(Object newValue)
     Sets a new Boolean value and rejects all non-Boolean values.
public  voidtriggerCommit()
     Triggers a commit event in BufferedValueModels that share this Trigger. Sets the value to Boolean.TRUE and ensures that listeners are notified about a value change to this new value.
public  voidtriggerFlush()
     Triggers a flush event in BufferedValueModels that share this Trigger. Sets the value to Boolean.FALSE and ensures that listeners are notified about a value change to the new value.


Constructor Detail
Trigger
public Trigger()(Code)
Constructs a Trigger set to neutral.




Method Detail
getValue
public Object getValue()(Code)
Returns a Boolean that indicates the current trigger state. a Boolean that indicates the current trigger state



setValue
public void setValue(Object newValue)(Code)
Sets a new Boolean value and rejects all non-Boolean values. Fires no change event if the new value is equal to the previously set value.

This method is not intended to be used by API users. Instead you should trigger commit and flush events by invoking #triggerCommit or #triggerFlush.
Parameters:
  newValue - the Boolean value to be set
throws:
  IllegalArgumentException - if the newValue is not a Boolean




triggerCommit
public void triggerCommit()(Code)
Triggers a commit event in BufferedValueModels that share this Trigger. Sets the value to Boolean.TRUE and ensures that listeners are notified about a value change to this new value. If necessary the value is temporarily set to null. This way it minimizes the number of PropertyChangeEvents fired by this Trigger.



triggerFlush
public void triggerFlush()(Code)
Triggers a flush event in BufferedValueModels that share this Trigger. Sets the value to Boolean.FALSE and ensures that listeners are notified about a value change to the new value. If necessary the value is temporarily set to null. This way it minimizes the number of PropertyChangeEvents fired by this Trigger.



Fields inherited from com.jgoodies.binding.value.AbstractValueModel
final public static String PROPERTYNAME_VALUE(Code)(Java Doc)

Methods inherited from com.jgoodies.binding.value.AbstractValueModel
final public void addValueChangeListener(PropertyChangeListener l)(Code)(Java Doc)
final public boolean booleanValue()(Code)(Java Doc)
final public double doubleValue()(Code)(Java Doc)
final public void fireValueChange(Object oldValue, Object newValue)(Code)(Java Doc)
final public void fireValueChange(Object oldValue, Object newValue, boolean checkIdentity)(Code)(Java Doc)
final public void fireValueChange(boolean oldValue, boolean newValue)(Code)(Java Doc)
final public void fireValueChange(int oldValue, int newValue)(Code)(Java Doc)
final public void fireValueChange(long oldValue, long newValue)(Code)(Java Doc)
final public void fireValueChange(double oldValue, double newValue)(Code)(Java Doc)
final public void fireValueChange(float oldValue, float newValue)(Code)(Java Doc)
final public float floatValue()(Code)(Java Doc)
public String getString()(Code)(Java Doc)
final public int intValue()(Code)(Java Doc)
final public long longValue()(Code)(Java Doc)
final public void removeValueChangeListener(PropertyChangeListener l)(Code)(Java Doc)
final public void setValue(boolean b)(Code)(Java Doc)
final public void setValue(double d)(Code)(Java Doc)
final public void setValue(float f)(Code)(Java Doc)
final public void setValue(int i)(Code)(Java Doc)
final public void setValue(long l)(Code)(Java Doc)
public String toString()(Code)(Java Doc)

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