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

import javax.faces.FacesWrapper;

/**
 * ExceptionHandlerFactory
 * is a factory object that creates (if needed) and returns a new {@link
 * ExceptionHandler} instance.
 *
 * 

 * There must be one ExceptionHandlerFactory instance per web
 * application that is utilizing JavaServer Faces.  This instance can be
 * acquired, in a portable manner, by calling:
 *
 * 
 *   ExceptionHandlerFactory factory = (ExceptionHandlerFactory)
 *    FactoryFinder.getFactory(FactoryFinder.EXCEPTION_HANDLER_FACTORY);
 * 
 *

 * 
 *
 * @since 2.0
 */

public abstract class ExceptionHandlerFactory implements FacesWrapper {

    public ExceptionHandlerFactory() {
    }
    
    /**
     * If this factory has been decorated, the 
     * implementation doing the decorating may override this method to provide
     * access to the implementation being wrapped.  A default implementation
     * is provided that returns null.
     */
    public ExceptionHandlerFactory getWrapped() {
        return null;
    }

    
    /**
     * Create and return a A new
     * ExceptionHandler instance.  The implementation must return
     * an ExceptionHandler instance suitable for the environment.
     * For example, in some cases it may be desirable for an 
     * ExceptionHandler to write error information
     * to the response instead of throwing exceptions as in the case of
     * Ajax applications. 
     */
    public abstract ExceptionHandler getExceptionHandler();
    
}