/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * 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.acegisecurity.providers.cas.cache;

import org.acegisecurity.providers.cas.CasAuthenticationProvider;
import org.acegisecurity.providers.cas.CasAuthenticationToken;
import org.acegisecurity.providers.cas.StatelessTicketCache;

/**
 * Implementation of @link {@link StatelessTicketCache} that has no backing cache.  Useful
 * in instances where storing of tickets for stateless session management is not required.
 * <p>
 * This is the default StatelessTicketCache of the @link {@link CasAuthenticationProvider} to
 * eliminate the unnecessary dependency on EhCache that applications have even if they are not using
 * the stateless session management.
 * 
 * @author Scott Battaglia
 * @version $Id$
 *
 *@see CasAuthenticationProvider
 */
public final class NullStatelessTicketCache implements StatelessTicketCache {

	/**
	 * @return null since we are not storing any tickets.
	 */
	public CasAuthenticationToken getByTicketId(final String serviceTicket) {
		return null;
	}

	/**
	 * This is a no-op since we are not storing tickets.
	 */
	public void putTicketInCache(final CasAuthenticationToken token) {
		// nothing to do
	}

	/**
	 * This is a no-op since we are not storing tickets.
	 */
	public void removeTicketFromCache(final CasAuthenticationToken token) {
		// nothing to do
	}

	/**
	 * This is a no-op since we are not storing tickets.
	 */
	public void removeTicketFromCache(final String serviceTicket) {
		// nothing to do
	}
}
