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package javax.faces.component.behavior;
import java.util.Collections;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.render.ClientBehaviorRenderer;
import javax.faces.render.RenderKit;
/**
* <p class="changed_added_2_0"><strong>ClientBehaviorBase</strong> is a
* convenience base class that implements the default concrete behavior
* of all methods defined by {@link ClientBehavior}.</p>
*
* <div class="changed_added_2_0">
*
* <p>Subclasses should either override getRendererType() to identify
* the {@link ClientBehaviorRenderer} to delegate to, or they should override
* <code>getScript()</code> to locally generate the desired Behavior
* script, and <code>decode()</code>.
* </p>
*
* </div>
*
* @since 2.0
*/
public class ClientBehaviorBase extends BehaviorBase implements ClientBehavior {
private static final Logger logger = Logger.getLogger("javax.faces.component.behavior",
"javax.faces.LogStrings");
/**
* <p class="changed_added_2_0">Default implementation of of {@link
* ClientBehavior#getScript}. If a {@link ClientBehaviorRenderer}
* is available for the specified behavior renderer type, this
* method delegates to the {@link ClientBehaviorRenderer#getScript}
* method. Otherwise, this method returns null. </p>
*
* @param behaviorContext the {@link ClientBehaviorContext}
*
* @return the script provided by the associated
* ClientBehaviorRenderer, or null if no ClientBehaviorRenderer is
* available.
*
* @throws NullPointerException if <code>behaviorContext</code> is
* <code>null</code>
*
* @since 2.0
*/
public String getScript(ClientBehaviorContext behaviorContext) {
if (null == behaviorContext) {
throw new NullPointerException();
}
ClientBehaviorRenderer renderer = getRenderer(behaviorContext.getFacesContext());
String script = null;
if (null != renderer){
script = renderer.getScript(behaviorContext, this);
}
return script;
}
/**
* <p class="changed_added_2_0">Default implementation of of {@link
* ClientBehavior#decode}. If a {@link ClientBehaviorRenderer} is
* available for the specified behavior renderer type, this method
* delegates to the ClientBehaviorRenderer's decode() method.
* Otherwise, no decoding is performed. </p>
*
* @param context {@link FacesContext} for the request we are processing
* @param component {@link UIComponent} the component associated with this {@link ClientBehavior}
*
* @throws NullPointerException if <code>context</code> or
* <code>component<code> is <code>null</code>.
*
* @since 2.0
*/
public void decode(FacesContext context,
UIComponent component) {
if (null == context || null == component) {
throw new NullPointerException();
}
ClientBehaviorRenderer renderer = getRenderer(context);
if (null != renderer){
renderer.decode(context, component, this);
}
}
/**
* <p class="changed_added_2_0">Returns the renderer type of the
* {@link ClientBehaviorRenderer} to use for the behavior. The default
* implementation returns null. Subclasses should either override this
* method to return a string that identifies the type of
* {@link ClientBehaviorRenderer} to use, or should override
* {@link #getScript} and perform script rendering locally in the
* {@link ClientBehavior} implementation.
* </p>
* @return the default renderer type, which is null.
*
* @since 2.0
*/
public String getRendererType() {
return null;
}
/**
* <p class="changed_added_2_0">Default implementation of
* {@link ClientBehavior#getHints()}.
* By default, no hints are specified, and this method returns an empty,
* umodifiable set.</p>
*
* @return an empty, unmodifiable set of {@link ClientBehaviorHint}s.
*
* @since 2.0
*/
public Set<ClientBehaviorHint> getHints() {
return Collections.emptySet();
}
/**
* <p class="changed_added_2_0">Convenience method to return the
* {@link ClientBehaviorRenderer} instance associated with this
* {@link ClientBehavior}, if any; otherwise, return
* <code>null</code>. </p>
* @param context {@link FacesContext} for the request we are processing
* @return {@link ClientBehaviorRenderer} instance from the current {@link RenderKit} or null.
*
* @throws NullPointerException if <code>context</code> is null.
*
* @since 2.0
*/
protected ClientBehaviorRenderer getRenderer(FacesContext context) {
if (null == context){
throw new NullPointerException();
}
ClientBehaviorRenderer renderer = null;
String rendererType = getRendererType();
if (null != rendererType){
RenderKit renderKit = context.getRenderKit();
if (null != renderKit){
renderer = renderKit.getClientBehaviorRenderer(rendererType);
}
if (null == renderer){
if (logger.isLoggable(Level.FINE)){
logger.fine("Can't get behavior renderer for type " + rendererType);
}
}
} else {
if(logger.isLoggable(Level.FINE)){
logger.fine("No renderer-type for behavior " + this.getClass().getName());
}
}
return renderer;
}
}