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

import java.io.IOException;
import javax.faces.component.UIComponent;

/**
 * This is the root class for markup
 * elements in Facelets VDL.  Facelets is XHTML, and XHTML is XML, and
 * the root unit of abstraction in XML is the element.  A
 * FaceletHandler instance represents an XML element at
 * runtime.  Two direct implementations exist to embody the contract for
 * more specific behavior.
 *
 * 

 * 

 * {@link CompositeFaceletHandler}

 * A container for other FaceletHandlers

 * {@link TagHandler}

 * The foundation class for FaceletHandlers associated
 * with markup in a Facelet document.

 * 

 * 

 * @since 2.0
 */
public interface FaceletHandler {

    /**
     * Process changes on a particular
     * UIComponent
     * 
     * @param ctx the current FaceletContext instance for this execution
     * @param parent the parent UIComponent to operate upon

     * @throws IOException if unable to load relativePath

     * @throws FaceletException if unable to parse the markup loaded from relativePath

     * @throws FacesException if unable to create child UIComponent instances

     * @throws ELException if any of the expressions in the markup
     * loaded from relativePath fail

     * @since 2.0

     */
    public void apply(FaceletContext ctx, UIComponent parent)
    throws IOException;
}