/** * Licensed under the Artistic License; you may not use this file * except in compliance with the License. * You may obtain a copy of the License at * *      http://displaytag.sourceforge.net/license.html * * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */package org.displaytag.util;import javax.servlet.jsp.PageContext;/** * RequestHelperFactory interface. * <p> * Users can specify a custom RequestHelperFactory implementation in <code>displaytag.properties</code>. * </p> * A custom RequestHelperFactory can return a different RequestHelper implementation (the * {@link DefaultRequestHelperFactory}returns instaces of {@link DefaultRequestHelper}) * @author Fabrizio Giustina * @version $Revision: 1081 $ ($Author: fgiust $) */public interface RequestHelperFactory{    /**     * returns a RequestHelper instance for a given request.     * @param pageContext PageContext passed by the tag     * @return RequestHelper instance     */    RequestHelper getRequestHelperInstance(PageContext pageContext);}