/*
* 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 jakarta.servlet.http;
import java.io.Serial;
/**
* Events of this type are either sent to an object that implements {@link HttpSessionBindingListener} when it is bound
* or unbound from a session, or to an {@link HttpSessionAttributeListener} that has been configured in the deployment
* descriptor when any attribute is bound, unbound or replaced in a session.
* <p>
* The session binds the object by a call to <code>HttpSession.setAttribute</code> and unbinds the object by a call to
* <code>HttpSession.removeAttribute</code>.
*
* @see HttpSession
* @see HttpSessionBindingListener
* @see HttpSessionAttributeListener
*/
public class HttpSessionBindingEvent extends HttpSessionEvent {
@Serial
private static final long serialVersionUID = 1L;
/**
* The name to which the object is being bound or unbound.
*/
private final String name;
/**
* The object is being bound or unbound.
*/
private final Object value;
/**
* Constructs an event that notifies an object that it has been bound to or unbound from a session. To receive the
* event, the object must implement {@link HttpSessionBindingListener}.
*
* @param session the session to which the object is bound or unbound
* @param name the name with which the object is bound or unbound
*
* @see #getName()
* @see #getSession()
*/
public HttpSessionBindingEvent(HttpSession session, String name) {
super(session);
this.name = name;
this.value = null;
}
/**
* Constructs an event that notifies an object that it has been bound to or unbound from a session. To receive the
* event, the object must implement {@link HttpSessionBindingListener}.
*
* @param session the session to which the object is bound or unbound
* @param name the name with which the object is bound or unbound
* @param value the object that is bound or unbound
*
* @see #getName()
* @see #getSession()
* @see #getValue()
*/
public HttpSessionBindingEvent(HttpSession session, String name, Object value) {
super(session);
this.name = name;
this.value = value;
}
/**
* Get the session that changed.
*
* @return The session that changed
*/
@Override
public HttpSession getSession() {
return super.getSession();
}
/**
* Returns the name with which the attribute is bound to or unbound from the session.
*
* @return a string specifying the name with which the object is bound to or unbound from the session
*/
public String getName() {
return name;
}
/**
* Returns the value of the attribute that has been added, removed or replaced.
*
* @return If the attribute was added (or bound), this is the value of the attribute. If the attribute was removed
* (or unbound), this is the value of the removed attribute. If the attribute was replaced, this is the
* old value of the attribute.
*
* @since Servlet 2.3
*/
public Object getValue() {
return this.value;
}
}