public class UICommand extends UIComponentBase implements ActionSource2
UICommand is a UIComponent
that represents
a user interface component which, when activated by the user, triggers
an application specific "command" or "action". Such a component is
typically rendered as a push button, a menu item, or a hyperlink.
When the decode()
method of this UICommand
, or
its corresponding Renderer
, detects that this control has been
activated, it will queue an ActionEvent
.
Later on, the broadcast()
method will ensure that this
event is broadcast to all interested listeners.
Listeners will be invoked in the following order:
ActionListener
s, in the order in which they were registered.
MethodExpression
(which will cover
the "actionListener" that was set as a MethodBinding
).
ActionListener
, retrieved from the
Application
- and therefore, any attached "action"
MethodExpression
.
By default, the rendererType
property must be set to
"javax.faces.Button
". This value can be changed by calling the
setRendererType()
method.
Modifier and Type | Field and Description |
---|---|
static String |
COMPONENT_FAMILY
The standard component family for this component.
|
static String |
COMPONENT_TYPE
The standard component type for this component.
|
ATTRS_WITH_DECLARED_DEFAULT_VALUES, BEANINFO_KEY, bindings, COMPOSITE_COMPONENT_TYPE_KEY, COMPOSITE_FACET_NAME, CURRENT_COMPONENT, CURRENT_COMPOSITE_COMPONENT, FACETS_KEY, HONOR_CURRENT_COMPONENT_ATTRIBUTES_PARAM_NAME, VIEW_LOCATION_KEY
Constructor and Description |
---|
UICommand()
Create a new
UICommand instance with default property
values. |
Modifier and Type | Method and Description |
---|---|
void |
addActionListener(ActionListener listener)
Add a new
ActionListener to the set of listeners interested
in being notified when ActionEvent s occur. |
void |
broadcast(FacesEvent event)
In addition to to the default
UIComponent.broadcast(javax.faces.event.FacesEvent)
processing, pass the ActionEvent being broadcast to the
method referenced by actionListener (if any),
and to the default ActionListener registered on the
Application . |
MethodBinding |
getAction()
Deprecated.
This has been replaced by
getActionExpression() . |
MethodExpression |
getActionExpression()
Return the
MethodExpression pointing at the application
action to be invoked, if this UIComponent is activated by
the user, during the Apply Request Values or Invoke
Application phase of the request processing lifecycle,
depending on the value of the immediate
property. |
MethodBinding |
getActionListener()
Deprecated.
Use
getActionListeners() instead. |
ActionListener[] |
getActionListeners()
Return the set of registered
ActionListener s for this
ActionSource instance. |
String |
getFamily()
Return the identifier of the component family to which this
component belongs.
|
Object |
getValue()
Returns the
value property of the
UICommand . |
boolean |
isImmediate()
The immediate flag.
|
void |
queueEvent(FacesEvent e)
Intercept
queueEvent and take the following
action. |
void |
removeActionListener(ActionListener listener)
Remove an existing
ActionListener (if any) from the set of
listeners interested in being notified when ActionEvent s
occur. |
void |
setAction(MethodBinding action)
Deprecated.
This has been replaced by
setActionExpression(javax.el.MethodExpression) . |
void |
setActionExpression(MethodExpression actionExpression)
Set the
MethodExpression pointing at the appication
action to be invoked, if this UIComponent is activated by
the user, during the Apply Request Values or Invoke
Application phase of the request processing lifecycle,
depending on the value of the immediate
property. |
void |
setActionListener(MethodBinding actionListener)
Deprecated.
This has been replaced by
addActionListener(javax.faces.event.ActionListener) . |
void |
setImmediate(boolean immediate)
Set the "immediate execution" flag for this
UIComponent . |
void |
setValue(Object value)
Sets the
value property of the UICommand . |
addClientBehavior, addFacesListener, clearInitialState, decode, encodeBegin, encodeChildren, encodeEnd, findComponent, getAttributes, getChildCount, getChildren, getClientBehaviors, getClientId, getDefaultEventName, getEventNames, getFacesContext, getFacesListeners, getFacet, getFacetCount, getFacets, getFacetsAndChildren, getId, getListenersForEventClass, getParent, getPassThroughAttributes, getRenderer, getRendererType, getRendersChildren, getValueBinding, invokeOnComponent, isRendered, isTransient, markInitialState, processDecodes, processRestoreState, processSaveState, processUpdates, processValidators, removeFacesListener, restoreAttachedState, restoreState, saveAttachedState, saveState, setId, setParent, setRendered, setRendererType, setTransient, setValueBinding, subscribeToEvent, unsubscribeFromEvent
encodeAll, getClientId, getCompositeComponentParent, getContainerClientId, getCurrentComponent, getCurrentCompositeComponent, getNamingContainer, getPassThroughAttributes, getResourceBundleMap, getStateHelper, getStateHelper, getTransientStateHelper, getTransientStateHelper, getValueExpression, initialStateMarked, isCompositeComponent, isInView, isVisitable, popComponentFromEL, processEvent, pushComponentToEL, restoreTransientState, saveTransientState, setInView, setValueExpression, visitTree
public static final String COMPONENT_TYPE
The standard component type for this component.
public static final String COMPONENT_FAMILY
The standard component family for this component.
public UICommand()
Create a new UICommand
instance with default property
values.
public String getFamily()
UIComponent
Return the identifier of the component family to which this
component belongs. This identifier, in conjunction with the value
of the rendererType
property, may be used to select
the appropriate Renderer
for this component instance.
getFamily
in class UIComponent
public MethodBinding getAction()
getActionExpression()
.If the implementing class also implements ActionSource2
, the implementation of this method must call
through to ActionSource2.getActionExpression()
and examine
the result. If the result came from a previous call to ActionSource.setAction(javax.faces.el.MethodBinding)
, extract the MethodBinding
from it and
return it. Otherwise, wrap the returned MethodExpression
in a MethodBinding
implementation, and return it.
If the implementing class does not implement
ActionSource2
, return the MethodBinding
pointing at the application action to be invoked,
if this UIComponent
is activated by the user, during the
Apply Request Values or Invoke Application
phase of the request processing lifecycle, depending on the value
of the immediate
property.
getAction
in interface ActionSource
public void setAction(MethodBinding action)
setActionExpression(javax.el.MethodExpression)
.If the implementing class also implements ActionSource2
, the implementation of this method must wrap the
argument action
in a class that implements MethodExpression
and call through to ActionSource2.setActionExpression(javax.el.MethodExpression)
, passing the wrapped
action
.
If the implementing class does not implement
ActionSource2
, set the MethodBinding
pointing at the appication action to be invoked, if this UIComponent
is activated by the user, during the Apply
Request Values or Invoke Application phase of the
request processing lifecycle, depending on the value of the
immediate
property.
Any method referenced by such an expression must be public, with
a return type of String
, and accept no parameters.
setAction
in interface ActionSource
action
- The new MethodBinding expressionpublic MethodBinding getActionListener()
getActionListeners()
instead.If ActionSource.setActionListener(javax.faces.el.MethodBinding)
was not previously called
for this instance, this method must return null
. If
it was called, this method must return the exact
MethodBinding
instance that was passed to ActionSource.setActionListener(javax.faces.el.MethodBinding)
.
The method to be invoked, if this UIComponent
is
activated by the user, will be called during the Apply
Request Values or Invoke Application phase of the
request processing lifecycle, depending upon the value of the
immediate
property.
getActionListener
in interface ActionSource
public void setActionListener(MethodBinding actionListener)
addActionListener(javax.faces.event.ActionListener)
.Wrap the argument actionListener
in an
implementation of ActionListener
and store it in the internal data structure that backs the ActionSource.getActionListeners()
method, taking care to over-write any
instance that was stored by a previous call to
setActionListener
.
Any method referenced by such an expression must be public, with
a return type of void
, and accept a single parameter of
type ActionEvent
.
setActionListener
in interface ActionSource
actionListener
- The new method binding expressionpublic boolean isImmediate()
The immediate flag.
isImmediate
in interface ActionSource
public void setImmediate(boolean immediate)
ActionSource
Set the "immediate execution" flag for this UIComponent
.
setImmediate
in interface ActionSource
immediate
- The new immediate execution flagpublic Object getValue()
Returns the value
property of the
UICommand
. This is most often rendered as a label.
public void setValue(Object value)
Sets the value
property of the UICommand
.
This is most often rendered as a label.
value
- the new valuepublic MethodExpression getActionExpression()
ActionSource2
Return the MethodExpression
pointing at the application
action to be invoked, if this UIComponent
is activated by
the user, during the Apply Request Values or Invoke
Application phase of the request processing lifecycle,
depending on the value of the immediate
property.
Note that it's possible that the returned
MethodExpression
is just a wrapper around a
MethodBinding
instance whith was set by a call to
ActionSource.setAction(javax.faces.el.MethodBinding)
. This makes it possible for the
default ActionListener
to continue to work properly with
older components.
getActionExpression
in interface ActionSource2
public void setActionExpression(MethodExpression actionExpression)
ActionSource2
Set the MethodExpression
pointing at the appication
action to be invoked, if this UIComponent
is activated by
the user, during the Apply Request Values or Invoke
Application phase of the request processing lifecycle,
depending on the value of the immediate
property.
Any method referenced by such an expression must be public, with
a return type of String
, and accept no parameters.
setActionExpression
in interface ActionSource2
actionExpression
- The new method expressionpublic void addActionListener(ActionListener listener)
ActionSource
Add a new ActionListener
to the set of listeners interested
in being notified when ActionEvent
s occur.
addActionListener
in interface ActionSource
listener
- The ActionListener
to be addedNullPointerException
- if listener
is null
public ActionListener[] getActionListeners()
ActionSource
Return the set of registered ActionListener
s for this
ActionSource
instance. If there are no registered listeners,
a zero-length array is returned.
getActionListeners
in interface ActionSource
public void removeActionListener(ActionListener listener)
ActionSource
Remove an existing ActionListener
(if any) from the set of
listeners interested in being notified when ActionEvent
s
occur.
removeActionListener
in interface ActionSource
listener
- The ActionListener
to be removedNullPointerException
- if listener
is null
public void broadcast(FacesEvent event) throws AbortProcessingException
In addition to to the default UIComponent.broadcast(javax.faces.event.FacesEvent)
processing, pass the ActionEvent
being broadcast to the
method referenced by actionListener
(if any),
and to the default ActionListener
registered on the
Application
.
broadcast
in class UIComponentBase
event
- FacesEvent
to be broadcastAbortProcessingException
- Signal the JavaServer Faces
implementation that no further processing on the current event
should be performedIllegalArgumentException
- if the implementation class
of this FacesEvent
is not supported by this componentNullPointerException
- if event
is
null
public void queueEvent(FacesEvent e)
Intercept queueEvent
and take the following
action. If the event is an
,
obtain the ActionEvent
UIComponent
instance from the event. If
the component is an
obtain the
value of its "immediate" property. If it is true, mark the
phaseId for the event to be
ActionSource
PhaseId.APPLY_REQUEST_VALUES
otherwise, mark the
phaseId to be PhaseId.INVOKE_APPLICATION
. The event
must be passed on to super.queueEvent()
before
returning from this method.
queueEvent
in class UIComponentBase
e
- FacesEvent
to be queuedCopyright © 1996-2015, Oracle and/or its affiliates. All Rights Reserved. Use is subject to license terms.