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package javax.faces.component.behavior;
import java.util.Set;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
/**
* <p class="changed_added_2_0"><strong>ClientBehavior</strong> is the
* base contract for {@link Behavior}s that attach script content to
* client-side events exposed by {@link ClientBehaviorHolder}
* components. Instances of <code>ClientBehavior</code> may be attached
* to components that implement the {@link ClientBehaviorHolder}
* contract by calling {@link ClientBehaviorHolder#addClientBehavior}.
* Once a <code>ClientBehavior</code> has been attached to a {@link
* ClientBehaviorHolder} component, the component calls {@link
* #getScript} to obtain the behavior's script and the component wires
* this up to the appropriate client-side event handler. Note that the
* script content returned by this method is always in-line script
* content. If the implementing class wants to invoke functions defined
* in other script resources, the implementing class must use the
* {@link javax.faces.application.ResourceDependency} or {@link
* javax.faces.application.ResourceDependencies} annotation. </p>
*
* @since 2.0
*/
public interface ClientBehavior extends Behavior {
/**
* <p class="changed_added_2_0">Return the script that implements this
* ClientBehavior's client-side logic.</p>
*
* <div class="changed_added_2_0">
*
* <p>ClientBehavior.getScript() implementations are allowed to return
* null to indicate that no script is required for this particular
* getScript() call. For example, a ClientBehavior implementation may
* return null if the Behavior is disabled.
* </p>
*
* </div>
*
* @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(). ClientBehavior
* implementations must not hold onto references to ClientBehaviorContexts.
*
* @return script that provides the client-side behavior, or null
* if no script is required.
* @throws NullPointerException if <code>behaviorContext</code> is
* <code>null</code>
*
* @since 2.0
*/
public String getScript(ClientBehaviorContext behaviorContext);
/**
* <p class="changed_added_2_0">Decode any new state of this
* {@link ClientBehavior} from the
* request contained in the specified {@link FacesContext}.</p>
*
* <div class="changed_added_2_0">
*
* <p>During decoding, events may be enqueued for later processing
* (by event listeners who have registered an interest), by calling
* <code>queueEvent()</code>. Default implementation delegates decoding
* to {@link javax.faces.render.ClientBehaviorRenderer#decode(FacesContext, UIComponent, ClientBehavior)}</p>
*
* </div>
*
* @param context {@link FacesContext} for the request we are processing
* @param component {@link UIComponent} the component associated with this {@link Behavior}
*
* @throws NullPointerException if <code>context</code> or
* <code>component</code> is <code>null</code>.
*
* @since 2.0
*/
public void decode(FacesContext context, UIComponent component);
/**
* <p class="changed_added_2_0">Returns hints that describe the
* behavior of the ClientBehavior implementation. The hints may
* impact how Renderers behave in the presence of Behaviors. For
* example, when a Behavior that specifies
* <code>ClientBehaviorHint.SUBMITTING</code> is present, the
* Renderer may choose to alternate the scripts that it generates
* itself.</p>
*
* @return a non-null, unmodifiable collection of ClientBehaviorHints.
*
* @since 2.0
*/
public Set<ClientBehaviorHint> getHints();
}