org.richfaces.event

Class MethodExpressionEventListener

java.lang.Object

org.richfaces.event.MethodExpressionEventListener

All Implemented Interfaces:

EventListener, javax.faces.component.StateHolder, javax.faces.event.FacesListener

Direct Known Subclasses:

FileUploadHandler.FileUploadListenerImpl, MethodExpressionItemChangeListener, MethodExpressionPanelToggleListener, MethodExpressionTreeSelectionChangeListener, MethodExpressionTreeToggleListener

public abstract class MethodExpressionEventListener
extends Object
implements javax.faces.event.FacesListener, javax.faces.component.StateHolder

MethodExpressionEventListener is a FacesListener that wraps a MethodExpression. When it receives a FacesEvent, it executes a method on an object identified by the MethodExpression.

Version:

1.0

Author:

akolonitsky

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MethodExpressionEventListener()
protected	MethodExpressionEventListener(javax.el.MethodExpression methodExpressionOneArg) Construct a FacesListener that contains a MethodExpression .To accomodate method expression targets that take no arguments instead of taking a FacesEvent argument, the implementation of this class must take the argument methodExpressionOneArg, extract its expression string, and create another MethodExpression whose expected param types match those of a zero argument method.
protected	MethodExpressionEventListener(javax.el.MethodExpression methodExprOneArg, javax.el.MethodExpression methodExprZeroArg) Construct a FacesListener that contains a MethodExpression.

Method Summary

Modifier and Type	Method and Description
boolean	isTransient()
void	processEvent(javax.faces.event.FacesEvent event) Call through to the MethodExpression passed in our constructor.
void	restoreState(javax.faces.context.FacesContext context, Object state) Both MethodExpression instances described in the constructor must be restored.
Object	saveState(javax.faces.context.FacesContext context) Both MethodExpression instances described in the constructor must be saved.
void	setTransient(boolean newTransientValue)

Methods inherited from class java.lang.Object

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

Constructor Detail

MethodExpressionEventListener

protected MethodExpressionEventListener()

MethodExpressionEventListener

protected MethodExpressionEventListener(javax.el.MethodExpression methodExpressionOneArg)

Construct a FacesListener that contains a MethodExpression .To accomodate method expression targets that take no arguments instead of taking a FacesEvent argument, the implementation of this class must take the argument methodExpressionOneArg, extract its expression string, and create another MethodExpression whose expected param types match those of a zero argument method. The usage requirements for both of these MethodExpression instances are described in processEvent(javax.faces.event.FacesEvent).

Parameters:

methodExpressionOneArg - a MethodExpression that points to a method that returns void and takes a single argument of type FacesEvent.

MethodExpressionEventListener

protected MethodExpressionEventListener(javax.el.MethodExpression methodExprOneArg,
                                        javax.el.MethodExpression methodExprZeroArg)

Construct a FacesListener that contains a MethodExpression.

Parameters:

methodExprOneArg -

methodExprZeroArg -

Method Detail

processEvent

public void processEvent(javax.faces.event.FacesEvent event)
                  throws javax.faces.event.AbortProcessingException

Call through to the MethodExpression passed in our constructor. First, try to invoke the MethodExpression passed to the constructor of this instance, passing the argument FacesEvent as the argument. If a MethodNotFoundException is thrown, call to the zero argument MethodExpression derived from the MethodExpression passed to the constructor of this instance. If that fails for any reason, throw an AbortProcessingException, including the cause of the failure.

Throws:

NullPointerException

javax.faces.event.AbortProcessingException

saveState

public Object saveState(javax.faces.context.FacesContext context)

Both MethodExpression instances described in the constructor must be saved.

Specified by:

saveState in interface javax.faces.component.StateHolder

restoreState

public void restoreState(javax.faces.context.FacesContext context,
                         Object state)

Both MethodExpression instances described in the constructor must be restored.

Specified by:

restoreState in interface javax.faces.component.StateHolder

isTransient

public boolean isTransient()

Specified by:

isTransient in interface javax.faces.component.StateHolder

setTransient

public void setTransient(boolean newTransientValue)

Specified by:

setTransient in interface javax.faces.component.StateHolder