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/*
 * Copyright 2014-2016 the original author or authors.
 *
 * Licensed 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 org.springframework.session.events;

import org.springframework.context.ApplicationEvent;
import org.springframework.session.Session;
import org.springframework.session.SessionRepository;

/**
 * For {@link SessionRepository} implementations that support it, this event is fired when
 * a {@link Session} is updated.
 *
 * @author Rob Winch
 * @since 1.1
 */
@SuppressWarnings("serial")
public abstract class AbstractSessionEvent extends ApplicationEvent {
	private final String sessionId;

	private final Session session;

	protected AbstractSessionEvent(Object source, String sessionId) {
		super(source);
		this.sessionId = sessionId;
		this.session = null;
	}

	AbstractSessionEvent(Object source, Session session) {
		super(source);
		this.session = session;
		this.sessionId = session.getId();
	}

	/**
	 * Gets the {@link Session} that was destroyed. For some {@link SessionRepository}
	 * implementations it may not be possible to get the original session in which case
	 * this may be null.
	 *
	 * @param  The type of Session
	 * @return the expired {@link Session} or null if the data store does not support
	 * obtaining it
	 */
	@SuppressWarnings("unchecked")
	public  S getSession() {
		return (S) this.session;
	}

	public String getSessionId() {
		return this.sessionId;
	}
}