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/* 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.context;

import org.acegisecurity.Authentication;

import java.io.Serializable;


/**
 * Interface defining the minimum security information associated with the
 * current thread of execution.
 * 
 * 
 * The security context is stored in a {@link SecurityContextHolder}.
 * 
 *
 * @author Ben Alex
 * @version $Id: SecurityContext.java 1496 2006-05-23 13:38:33Z benalex $
 */
public interface SecurityContext extends Serializable {
    //~ Methods ========================================================================================================

    /**
     * Obtains the currently authenticated principal, or an authentication request token.
     *
     * @return the Authentication or null if no authentication information is available
     */
    public Authentication getAuthentication();

    /**
     * Changes the currently authenticated principal, or removes the authentication information.
     *
     * @param authentication the new Authentication token, or null if no further
     *        authentication information should be stored
     */
    public void setAuthentication(Authentication authentication);
}