001    /*
002    * Copyright 2004 The Apache Software Foundation
003    *
004    * Licensed under the Apache License, Version 2.0 (the "License");
005    * you may not use this file except in compliance with the License.
006    * You may obtain a copy of the License at
007    *
008    *     http://www.apache.org/licenses/LICENSE-2.0
009    *
010    * Unless required by applicable law or agreed to in writing, software
011    * distributed under the License is distributed on an "AS IS" BASIS,
012    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013    * See the License for the specific language governing permissions and
014    * limitations under the License.
015    */
016    package javax.servlet;
017    
018    
019        /** 
020          * This is the event class for notifications of changes to the 
021          * attributes of the servlet request in an application.
022          * @see ServletRequestAttributeListener
023          * @since  Servlet 2.4
024          */
025    
026    public class ServletRequestAttributeEvent extends ServletRequestEvent { 
027        private String name;
028        private Object value;
029    
030         /** Construct a ServletRequestAttributeEvent giving the servlet context
031          * of this web application, the ServletRequest whose attributes are
032          * changing and the name and value of the attribute.
033          *
034          * @param sc               the ServletContext that is sending the event.
035          * @param request          the ServletRequest that is sending the event.
036          * @param name             the name of the request attribute.
037          * @param value            the value of the request attribute.
038          */
039        public ServletRequestAttributeEvent(ServletContext sc, ServletRequest request, String name, Object value) {
040            super(sc, request);
041            this.name = name;
042            this.value = value;
043        }
044    
045        /**
046          * Return the name of the attribute that changed on the ServletRequest.
047          *
048          * @return         the name of the changed request attribute
049          */
050        public String getName() {
051            return this.name;
052        }
053    
054        /**
055          * Returns the value of the attribute that has been added, removed or 
056          * replaced. If the attribute was added, this is the value of the 
057          * attribute. If the attribute was removed, this is the value of the 
058          * removed attribute. If the attribute was replaced, this is the old 
059          * value of the attribute.
060          *
061          * @return         the value of the changed request attribute
062          */
063        public Object getValue() {
064            return this.value;   
065        }
066    }