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package javax.faces.component;
import javax.el.MethodExpression;
import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import javax.faces.el.MethodBinding;
import javax.faces.event.*;
import javax.faces.render.Renderer;
/**
* UICommand is a {@link 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 {@link UICommand}, or
* its corresponding {@link Renderer}, detects that this control has been
* activated, it will queue an {@link 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:
*
* - {@link ActionListener}s, in the order in which they were registered.
*
- The "actionListener" {@link MethodExpression} (which will cover
* the "actionListener" that was set as a
MethodBinding).
* - The default {@link ActionListener}, retrieved from the
* {@link Application} - and therefore, any attached "action"
* {@link MethodExpression}.
*
*
* By default, the rendererType property must be set to
* "javax.faces.Button". This value can be changed by calling the
* setRendererType() method.
*/
public class UICommand extends UIComponentBase
implements ActionSource2 {
// ------------------------------------------------------ Manifest Constants
/**
* The standard component type for this component.
*/
public static final String COMPONENT_TYPE = "javax.faces.Command";
/**
* The standard component family for this component.
*/
public static final String COMPONENT_FAMILY = "javax.faces.Command";
/**
* Properties that are tracked by state saving.
*/
enum PropertyKeys {
value,
immediate,
methodBindingActionListener,
actionExpression,
}
// ------------------------------------------------------------ Constructors
/**
* Create a new {@link UICommand} instance with default property
* values.
*/
public UICommand() {
super();
setRendererType("javax.faces.Button");
}
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
// ------------------------------------------------- ActionSource/ActionSource2 Properties
/**
* {@inheritDoc}
*
* @deprecated This has been replaced by {@link #getActionExpression}.
*/
public MethodBinding getAction() {
MethodBinding result = null;
MethodExpression me;
if (null != (me = getActionExpression())) {
// if the MethodExpression is an instance of our private
// wrapper class.
if (me.getClass().equals(MethodExpressionMethodBindingAdapter.class)) {
result = ((MethodExpressionMethodBindingAdapter) me).getWrapped();
} else {
// otherwise, this is a real MethodExpression. Wrap it
// in a MethodBinding.
result = new MethodBindingMethodExpressionAdapter(me);
}
}
return result;
}
/**
* {@inheritDoc}
*
* @deprecated This has been replaced by {@link #setActionExpression(javax.el.MethodExpression)}.
*/
public void setAction(MethodBinding action) {
MethodExpressionMethodBindingAdapter adapter;
if (null != action) {
adapter = new MethodExpressionMethodBindingAdapter(action);
setActionExpression(adapter);
} else {
setActionExpression(null);
}
}
/**
* {@inheritDoc}
* @deprecated Use {@link #getActionListeners} instead.
*/
public MethodBinding getActionListener() {
return (MethodBinding) getStateHelper().get(PropertyKeys.methodBindingActionListener);
}
/**
* {@inheritDoc}
* @deprecated This has been replaced by {@link #addActionListener(javax.faces.event.ActionListener)}.
*/
public void setActionListener(MethodBinding actionListener) {
getStateHelper().put(PropertyKeys.methodBindingActionListener, actionListener);
}
/**
* The immediate flag.
*/
//private Boolean immediate;
public boolean isImmediate() {
return (Boolean) getStateHelper().eval(PropertyKeys.immediate, false);
}
public void setImmediate(boolean immediate) {
getStateHelper().put(PropertyKeys.immediate, immediate);
}
/**
* Returns the value property of the
* UICommand. This is most often rendered as a label.
*/
public Object getValue() {
return getStateHelper().eval(PropertyKeys.value);
}
/**
* Sets the value property of the UICommand.
* This is most often rendered as a label.
*
* @param value the new value
*/
public void setValue(Object value) {
getStateHelper().put(PropertyKeys.value, value);
}
// ---------------------------------------------------- ActionSource / ActionSource2 Methods
public MethodExpression getActionExpression() {
return (MethodExpression) getStateHelper().get(PropertyKeys.actionExpression);
}
public void setActionExpression(MethodExpression actionExpression) {
getStateHelper().put(PropertyKeys.actionExpression, actionExpression);
}
/**
* @throws NullPointerException {@inheritDoc}
*/
public void addActionListener(ActionListener listener) {
addFacesListener(listener);
}
public ActionListener[] getActionListeners() {
ActionListener al[] = (ActionListener [])
getFacesListeners(ActionListener.class);
return (al);
}
/**
* @throws NullPointerException {@inheritDoc}
*/
public void removeActionListener(ActionListener listener) {
removeFacesListener(listener);
}
// ----------------------------------------------------- UIComponent Methods
/**
* In addition to to the default {@link UIComponent#broadcast}
* processing, pass the {@link ActionEvent} being broadcast to the
* method referenced by actionListener (if any),
* and to the default {@link ActionListener} registered on the
* {@link javax.faces.application.Application}.
*
* @param event {@link FacesEvent} to be broadcast
*
* @throws AbortProcessingException Signal the JavaServer Faces
* implementation that no further processing on the current event
* should be performed
* @throws IllegalArgumentException if the implementation class
* of this {@link FacesEvent} is not supported by this component
* @throws NullPointerException if event is
* null
*/
public void broadcast(FacesEvent event) throws AbortProcessingException {
// Perform standard superclass processing (including calling our
// ActionListeners)
super.broadcast(event);
if (event instanceof ActionEvent) {
FacesContext context = getFacesContext();
// Notify the specified action listener method (if any)
MethodBinding mb = getActionListener();
if (mb != null) {
mb.invoke(context, new Object[] { event });
}
// Invoke the default ActionListener
ActionListener listener =
context.getApplication().getActionListener();
if (listener != null) {
listener.processAction((ActionEvent) event);
}
}
}
/**
* Intercept queueEvent and take the following
* action. If the event is an {@link ActionEvent},
* obtain the UIComponent instance from the event. If
* the component is an {@link ActionSource} obtain the
* value of its "immediate" property. If it is true, mark the
* phaseId for the event to be
* 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.
*/
public void queueEvent(FacesEvent e) {
UIComponent c = e.getComponent();
if (e instanceof ActionEvent && c instanceof ActionSource) {
if (((ActionSource) c).isImmediate()) {
e.setPhaseId(PhaseId.APPLY_REQUEST_VALUES);
} else {
e.setPhaseId(PhaseId.INVOKE_APPLICATION);
}
}
super.queueEvent(e);
}
}