jakarta.faces.component.behavior.ClientBehavior Maven / Gradle / Ivy
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* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.component.behavior;
import java.util.Set;
import jakarta.faces.component.UIComponent;
import jakarta.faces.context.FacesContext;
/**
*
* ClientBehavior is the base contract for {@link Behavior}s that attach script content to client-side
* events exposed by {@link ClientBehaviorHolder} components. Instances of ClientBehavior may be attached
* to components that implement the {@link ClientBehaviorHolder} contract by calling
* {@link ClientBehaviorHolder#addClientBehavior}. Once a ClientBehavior 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 jakarta.faces.application.ResourceDependency} or
* {@link jakarta.faces.application.ResourceDependencies} annotation.
*
*
* @since 2.0
*/
public interface ClientBehavior extends Behavior {
/**
*
* Return the script that implements this ClientBehavior's client-side logic.
*
*
*
*
*
* 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.
*
*
*
*
* @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 behaviorContext is null
*
* @since 2.0
*/
String getScript(ClientBehaviorContext behaviorContext);
/**
*
* Decode any new state of this {@link ClientBehavior} from the request contained in the specified {@link FacesContext}.
*
*
*
*
*
* During decoding, events may be enqueued for later processing (by event listeners who have registered an interest), by
* calling queueEvent(). Default implementation delegates decoding to
* {@link jakarta.faces.render.ClientBehaviorRenderer#decode(FacesContext, UIComponent, ClientBehavior)}
*
*
*
*
* @param context {@link FacesContext} for the request we are processing
* @param component {@link UIComponent} the component associated with this {@link Behavior}
*
* @throws NullPointerException if context or component is null.
*
* @since 2.0
*/
void decode(FacesContext context, UIComponent component);
/**
*
* 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
* ClientBehaviorHint.SUBMITTING is present, the Renderer may choose to alternate the scripts that it
* generates itself.
*
*
* @return a non-null, unmodifiable collection of ClientBehaviorHints.
*
* @since 2.0
*/
Set getHints();
}