/*
* $Id: UICommand.java,v 1.79.4.3 2007/10/18 16:57:29 rlubke Exp $
*/
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package javax.faces.component;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import javax.faces.el.MethodBinding;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ActionEvent;
import javax.faces.event.ActionListener;
import javax.faces.event.FacesEvent;
import javax.faces.event.PhaseId;
import javax.faces.render.Renderer;
/**
* <p><strong>UICommand</strong> 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.</p>
*
* <p>When the <code>decode()</code> 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 <code>broadcast()</code> method will ensure that this
* event is broadcast to all interested listeners.</p>
*
* <p>Listeners will be invoked in the following order:
* <ol>
* <li>{@link ActionListener}s, in the order in which they were registered.
* <li>The "actionListener" {@link MethodExpression} (which will cover
* the "actionListener" that was set as a <code>MethodBinding</code>).
* <li>The default {@link ActionListener}, retrieved from the
* {@link Application} - and therefore, any attached "action"
* {@link MethodExpression}.
* </ol>
* </p>
* <p>By default, the <code>rendererType</code> property must be set to
* "<code>javax.faces.Button</code>". This value can be changed by calling the
* <code>setRendererType()</code> method.</p>
*/
public class UICommand extends UIComponentBase
implements ActionSource2 {
// ------------------------------------------------------ Manifest Constants
/**
* <p>The standard component type for this component.</p>
*/
public static final String COMPONENT_TYPE = "javax.faces.Command";
/**
* <p>The standard component family for this component.</p>
*/
public static final String COMPONENT_FAMILY = "javax.faces.Command";
// ------------------------------------------------------------ Constructors
/**
* <p>Create a new {@link UICommand} instance with default property
* values.</p>
*/
public UICommand() {
super();
setRendererType("javax.faces.Button");
}
// ------------------------------------------------------ Instance Variables
private Object value = null;
// -------------------------------------------------------------- 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 this.methodBindingActionListener;
}
/**
* {@inheritDoc}
* @deprecated This has been replaced by {@link #addActionListener(javax.faces.event.ActionListener)}.
*/
public void setActionListener(MethodBinding actionListener) {
this.methodBindingActionListener = actionListener;
}
/**
* <p>The immediate flag.</p>
*/
private Boolean immediate;
public boolean isImmediate() {
if (this.immediate != null) {
return (this.immediate);
}
ValueExpression ve = getValueExpression("immediate");
if (ve != null) {
try {
return (Boolean.TRUE.equals(ve.getValue(getFacesContext().getELContext())));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (false);
}
}
public void setImmediate(boolean immediate) {
this.immediate = immediate;
}
/**
* <p>Returns the <code>value</code> property of the
* <code>UICommand</code>. This is most often rendered as a label.</p>
*/
public Object getValue() {
if (this.value != null) {
return (this.value);
}
ValueExpression ve = getValueExpression("value");
if (ve != null) {
try {
return (ve.getValue(getFacesContext().getELContext()));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (null);
}
}
/**
* <p>Sets the <code>value</code> property of the <code>UICommand</code>.
* This is most often rendered as a label.</p>
*
* @param value the new value
*/
public void setValue(Object value) {
this.value = value;
}
private MethodBinding methodBindingActionListener = null;
// ---------------------------------------------------- ActionSource / ActionSource2 Methods
/**
* <p>The {@link MethodExpression} that, when invoked, yields the
* literal outcome value.</p>
*/
private MethodExpression actionExpression = null;
public MethodExpression getActionExpression() {
return actionExpression;
}
public void setActionExpression(MethodExpression actionExpression) {
this.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);
}
// ----------------------------------------------------- StateHolder Methods
private Object[] values;
public Object saveState(FacesContext context) {
if (values == null) {
values = new Object[5];
}
values[0] = super.saveState(context);
values[1] = saveAttachedState(context, methodBindingActionListener);
values[2] = saveAttachedState(context, actionExpression);
values[3] = immediate;
values[4] = value;
return (values);
}
public void restoreState(FacesContext context, Object state) {
values = (Object[]) state;
super.restoreState(context, values[0]);
methodBindingActionListener = (MethodBinding)
restoreAttachedState(context, values[1]);
actionExpression =
(MethodExpression) restoreAttachedState(context, values[2]);
immediate = (Boolean) values[3];
value = values[4];
}
// ----------------------------------------------------- UIComponent Methods
/**
* <p>In addition to to the default {@link UIComponent#broadcast}
* processing, pass the {@link ActionEvent} being broadcast to the
* method referenced by <code>actionListener</code> (if any),
* and to the default {@link ActionListener} registered on the
* {@link javax.faces.application.Application}.</p>
*
* @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 <code>event</code> is
* <code>null</code>
*/
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);
}
}
}
/**
* <p>Intercept <code>queueEvent</code> and, for {@link ActionEvent}s,
* mark the phaseId for the event to be
* <code>PhaseId.APPLY_REQUEST_VALUES</code> if the
* <code>immediate</code> flag is true,
* <code>PhaseId.INVOKE_APPLICATION</code> otherwise.</p>
*/
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);
}
}