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java/javax/servlet/ServletRequestAttributeEvent.java

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+/*
+ * 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.
+ *
+ * @see ServletRequestAttributeListener
+ * @since Servlet 2.4
+ */
+public class ServletRequestAttributeEvent extends ServletRequestEvent {
+    private static final long serialVersionUID = 1L;
+
+    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;
+    }
+}