public class MethodExpressionActionListener extends Object implements ActionListener, StateHolder
MethodExpressionActionListener
is an ActionListener
that wraps a MethodExpression
. When it receives a ActionEvent
, it
executes a method on an object identified by the MethodExpression
.
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Constructor and Description |
---|
MethodExpressionActionListener() |
MethodExpressionActionListener(MethodExpression methodExpressionOneArg)
Construct a
ValueChangeListener that
contains a MethodExpression . |
MethodExpressionActionListener(MethodExpression methodExpressionOneArg,
MethodExpression methodExpressionZeroArg) |
Modifier and Type | Method and Description |
---|---|
boolean |
isTransient()
If true, the Object implementing this interface must not
participate in state saving or restoring.
|
void |
processAction(ActionEvent actionEvent)
Call through to the
MethodExpression passed in our constructor. |
void |
restoreState(FacesContext context,
Object state)
Both |
Object |
saveState(FacesContext context)
Both |
void |
setTransient(boolean newTransientValue)
Denotes
whether or not the Object implementing this interface must or
must not participate in state saving or restoring.
|
public MethodExpressionActionListener()
public MethodExpressionActionListener(MethodExpression methodExpressionOneArg)
Construct a ValueChangeListener
that
contains a MethodExpression
. To accomodate method expression targets
that take no arguments instead of taking an ActionEvent
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
processAction(javax.faces.event.ActionEvent)
.
methodExpressionOneArg
- a MethodExpression
that points to a method that returns void
and takes
a single argument of type ActionEvent
.public MethodExpressionActionListener(MethodExpression methodExpressionOneArg, MethodExpression methodExpressionZeroArg)
public void processAction(ActionEvent actionEvent) throws 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 ActionEvent
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.
processAction
in interface ActionListener
actionEvent
- The ActionEvent
that has occurredNullPointerException
AbortProcessingException
- Signal the Jakarta Server Faces
implementation that no further processing on the current event
should be performedpublic Object saveState(FacesContext context)
Both MethodExpression
instances described in the constructor must be saved.
saveState
in interface StateHolder
context
- the Faces context.public void restoreState(FacesContext context, Object state)
Both MethodExpression
instances described in the constructor must be restored.
restoreState
in interface StateHolder
context
- the Faces context.state
- the state.public boolean isTransient()
StateHolder
If true, the Object implementing this interface must not participate in state saving or restoring.
isTransient
in interface StateHolder
true
if transient, false
otherwise.public void setTransient(boolean newTransientValue)
StateHolder
Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.
setTransient
in interface StateHolder
newTransientValue
- boolean pass true
if this
Object will not
participate in state saving or restoring, otherwise pass
false
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