/*
 * 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 about changes to the attributes of the
 * servlet context of a web application.
 *
 * @version $Rev$ $Date$
 * @see ServletContextAttributeListener
 * @since v 2.3
 */

public class ServletContextAttributeEvent extends ServletContextEvent {
    private final String name;
    private final Object value;

    /**
     * Construct a ServletContextAttributeEvent from the given context for the
     * given attribute name and attribute value.
     */
    public ServletContextAttributeEvent(ServletContext source, String name, Object value) {
        super(source);
        this.name = name;
        this.value = value;
    }

    /**
     * Return the name of the attribute that changed on the ServletContext.
     * @return name of the changed attribute
     */
    public String getName() {
        return 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 value of the changed attribute
     */
    public Object getValue() {
        return value;
    }
}

