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/**
 * Copyright (C) 2009 Jasig, Inc.
 *
 * 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.jasig.cas.server.session;

import org.jasig.cas.server.authentication.Authentication;

/**
 * Defines a policy for determining whether an object is expired or not.  Assumes that these objects
 * hold some form of {@link org.jasig.cas.server.session.State}.
 *
 * @author Scott Battaglia
 * @version $Revision$ $Date$
 * @since 4.0.0
 *
 */
public interface ExpirationPolicy {

    /**
     * Determines whether the object is valid or not.
     *
     * @param state the state to check.
     * @param authentication the root authentication object, if it exists.  Implementations should check if this is null
     * if they plan on using it.
     * @return true if its expired, false otherwise.
     */
    boolean isExpired(State state, Authentication authentication);
}