/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package javax.servlet;


/**
 * This is the event class for notifications of changes to the
 * attributes of the servlet request in an application.
 *
 * @since Servlet 2.4
 * @see ServletRequestAttributeListener
 * @version $Rev$ $Date$
 */

public class ServletRequestAttributeEvent extends ServletRequestEvent {
    private final String name;
    private final Object value;

    /**
     * Construct a ServletRequestAttributeEvent giving the servlet context
     * of this web application, the ServletRequest whose attributes are
     * changing and the name and value of the attribute.
     *
     * @param sc      the ServletContext that is sending the event.
     * @param request the ServletRequest that is sending the event.
     * @param name    the name of the request attribute.
     * @param value   the value of the request attribute.
     */
    public ServletRequestAttributeEvent(ServletContext sc, ServletRequest request, String name, Object value) {
        super(sc, request);
        this.name = name;
        this.value = value;
    }

    /**
     * Return the name of the attribute that changed on the ServletRequest.
     *
     * @return the name of the changed request attribute
     */
    public String getName() {
        return this.name;
    }

    /**
     * Returns the value of the attribute that has been added, removed or
     * replaced. If the attribute was added, this is the value of the
     * attribute. If the attribute was removed, this is the value of the
     * removed attribute. If the attribute was replaced, this is the old
     * value of the attribute.
     *
     * @return the value of the changed request attribute
     */
    public Object getValue() {
        return this.value;   
    }
}