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package javax.faces.render;
import javax.faces.component.UIComponent;
import javax.faces.component.behavior.ClientBehavior;
import javax.faces.component.behavior.ClientBehaviorContext;
import javax.faces.context.FacesContext;
/**
* <p>A <strong class="changed_added_2_0">ClientBehaviorRenderer</strong> produces
* the client-side script that implements a {@link ClientBehavior}'s client-side
* logic. It can also enqueue server-side {@link javax.faces.event.BehaviorEvent}s that may be
* processed later by event listeners that have registered an interest.</p>
*
* <p>Individual {@link ClientBehaviorRenderer} instances will be instantiated as
* requested during the rendering process, and will remain in existence for the
* remainder of the lifetime of a web application. Because each instance
* may be invoked from more than one request processing thread simultaneously,
* they MUST be programmed in a thread-safe manner.</p>
*
* @since 2.0
*/
public abstract class ClientBehaviorRenderer {
// ------------------------------------------------------ Rendering Methods
/**
* <p class="changed_added_2_0">Return the script that implements this
* ClientBehavior's client-side logic. The default implementation returns
* <code>null</code>.</p>
*
* <p>ClientBehaviorRenderer.getScript() implementations are allowed to return
* null to indicate that no script is required for this particular
* getScript() call. For example, a ClientBehaviorRenderer implementation may
* return null if the associated ClientBehavior is disabled.
* </p>
*
* @param behaviorContext the {@link ClientBehaviorContext} that provides
* properties that might influence this getScript() call. Note that
* ClientBehaviorContext instances are short-lived objects that are only
* valid for the duration of the call to getScript(). ClientBehaviorRenderer
* implementations must not hold onto references to ClientBehaviorContexts.
*
* @param behavior the ClientBehavior instance that generates script.
*
* @return script that provides the client-side behavior, or null
* if no script is required.
*
* @since 2.0
*
*/
public String getScript(ClientBehaviorContext behaviorContext,
ClientBehavior behavior) {
return null;
}
/**
* <p class="changed_added_2_0">Decode any new state of this {@link ClientBehavior}
* from the request contained in the specified {@link FacesContext}.</p>
*
* <p>During decoding, events may be enqueued for later processing
* (by event listeners who have registered an interest), by calling
* <code>queueEvent()</code>.</p>
*
* @param context {@link FacesContext} for the request we are processing
* @param component {@link UIComponent} the component associated with this
* {@link javax.faces.component.behavior.Behavior}
* @param behavior {@link ClientBehavior} the behavior instance
*
* @throws NullPointerException if <code>context</code>,
* <code>component</code> <code>behavior</code> is <code>null</code>
*
* @since 2.0
*/
public void decode(FacesContext context,
UIComponent component,
ClientBehavior behavior) {
if (null == context || null == component || behavior == null) {
throw new NullPointerException();
}
}
}