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JSR-000344: JavaServer(TM) Faces 2.2 API
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package javax.faces.component.visit;

import javax.faces.component.UIComponent;

/**
 *
 * A simple callback interface that enables 
 * taking action on a specific UIComponent (either facet or child) during 
 * a component tree visit.
 * 
 * @see UIComponent#visitTree UIComponent.visitTree()
 *
 * @since 2.0
 */
public interface VisitCallback {
    
    /**
     * This method is called during component tree visits by 
     * {@link VisitContext#invokeVisitCallback VisitContext.invokeVisitCallback()} 
     * to visit the specified component.  At the point in time when this 
     * method is called, the argument {@code target} is guaranteed
     * to be in the proper state with respect to its ancestors in the
     * View.
     *
     * @param context the {@link VisitContext} for this tree visit.
     *
     * @param target the {@link UIComponent} to visit
     *
     * @return a {@link VisitResult} that indicates whether to continue
     *   visiting the component's subtree, skip visiting the component's
     *   subtree or end the visit.
     */
    public VisitResult visit(VisitContext context, UIComponent target);
}