/** * 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 java.util.Map;/** * A RequestHelper object is used to read parameters from the request. Main features are handling of numeric parameters * and the ability to create Href objects from the current request. * @author Fabrizio Giustina * @version $Revision: 1081 $ ($Author: fgiust $) */public interface RequestHelper{    /**     * return the current Href for the request (base url and parameters).     * @return Href     */    Href getHref();    /**     * Reads a String parameter from the request.     * @param key String parameter name     * @return String parameter value     */    String getParameter(String key);    /**     * Reads an Integer parameter from the request.     * @param key String parameter name     * @return Integer parameter value or null if the parameter is not found or it can't be transformed to an Integer     */    Integer getIntParameter(String key);    /**     * Returns a Map containing all the parameters in the request.     * @return Map     */    Map getParameterMap();}