javax.faces.event
Class MethodExpressionValueChangeListener

java.lang.Object
  javax.faces.event.MethodExpressionValueChangeListener

All Implemented Interfaces:

EventListener, StateHolder, FacesListener, ValueChangeListener

public class MethodExpressionValueChangeListener
extends Object
implements ValueChangeListener, StateHolder

MethodExpressionValueChangeListener is a ValueChangeListener that wraps a MethodExpression. When it receives a ValueChangeEvent, it executes a method on an object identified by the MethodExpression.

Constructor Summary
MethodExpressionValueChangeListener()
MethodExpressionValueChangeListener(MethodExpression methodExpression)           Construct a ValueChangeListener that contains a MethodExpression.

 

Method Summary
boolean	isTransient()           If true, the Object implementing this interface must not participate in state saving or restoring.
void	processValueChange(ValueChangeEvent valueChangeEvent)           Invoked when the value change described by the specified ValueChangeEvent occurs.
void	restoreState(FacesContext context, Object state)            Perform any processing required to restore the state from the entries in the state Object.
Object	saveState(FacesContext context)            Gets the state of the instance as a Serializable Object.
void	setTransient(boolean newTransientValue)           Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

MethodExpressionValueChangeListener

public MethodExpressionValueChangeListener()

MethodExpressionValueChangeListener

public MethodExpressionValueChangeListener(MethodExpression methodExpression)

Construct a ValueChangeListener that contains a MethodExpression.

processValueChange

public void processValueChange(ValueChangeEvent valueChangeEvent)
                        throws AbortProcessingException

Description copied from interface: ValueChangeListener

Invoked when the value change described by the specified ValueChangeEvent occurs.

Specified by:

processValueChange in interface ValueChangeListener

Parameters:

valueChangeEvent - The ValueChangeEvent that has occurred

Throws:

NullPointerException

AbortProcessingException - Signal the JavaServer Faces implementation that no further processing on the current event should be performed

saveState

public Object saveState(FacesContext context)

Description copied from interface: StateHolder

Gets the state of the instance as a Serializable Object.

If the class that implements this interface has references to instances that implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the StateHolder.saveState(javax.faces.context.FacesContext) method on all those instances as well. This method must not save the state of children and facets. That is done via the StateManager

This method must not alter the state of the implementing object. In other words, after executing this code:

 Object state = component.saveState(facesContext);
 

component should be the same as before executing it.

The return from this method must be Serializable

Specified by:

saveState in interface StateHolder

restoreState

public void restoreState(FacesContext context,
                         Object state)

Description copied from interface: StateHolder

Perform any processing required to restore the state from the entries in the state Object.

If the class that implements this interface has references to instances that also implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the StateHolder.restoreState(javax.faces.context.FacesContext, java.lang.Object) method on all those instances as well.

Specified by:

restoreState in interface StateHolder

isTransient

public boolean isTransient()

Description copied from interface: StateHolder

If true, the Object implementing this interface must not participate in state saving or restoring.

Specified by:

isTransient in interface StateHolder

setTransient

public void setTransient(boolean newTransientValue)

Description copied from interface: StateHolder

Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.

Specified by:

setTransient in interface StateHolder

Parameters:

newTransientValue - boolean pass true if this Object will participate in state saving or restoring, otherwise pass false.