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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;


/**
 * An abstract implementation of the {@link AuthenticationManager}.
 *
 * @author Wesley Hall
 * @version $Id: AbstractAuthenticationManager.java 2654 2008-02-18 20:44:09Z luke_t $
 */
public abstract class AbstractAuthenticationManager implements AuthenticationManager {

    //~ Instance fields ================================================================================================
    private boolean clearExtraInformation = true;

    //~ Methods ========================================================================================================

    /**
     * An implementation of the authenticate method that calls the abstract method
     * doAuthenticatation to do its work.
     *  If doAuthenticate throws an AuthenticationException then the exception is populated
     * with the failed Authentication object that failed.
     *
     * @param authRequest the authentication request object
     *
     * @return a fully authenticated object including credentials
     *
     * @throws AuthenticationException if authentication fails
     */
    public final Authentication authenticate(Authentication authRequest)
        throws AuthenticationException {
        try {
            return doAuthentication(authRequest);
        } catch (AuthenticationException e) {
            e.setAuthentication(authRequest);

            if (clearExtraInformation) {
                e.clearExtraInformation();
            }

            throw e;
        }
    }

    /**
     * Concrete implementations of this class override this method to provide the authentication service.
     *  The contract for this method is documented in the {@link
     * AuthenticationManager#authenticate(Authentication)}.
     *
     * @param authentication the authentication request object
     *
     * @return a fully authenticated object including credentials
     *
     * @throws AuthenticationException if authentication fails
     */
    protected abstract Authentication doAuthentication(Authentication authentication)
        throws AuthenticationException;

    /**
     * If set to true, the extraInformation set on an AuthenticationException will be cleared
     * before rethrowing it. This is useful for use with remoting protocols where the information shouldn't
     * be serialized to the client. Defaults to 'false'.
     *
     * @see AuthenticationException#getExtraInformation()
     */
    public void setClearExtraInformation(boolean clearExtraInformation) {
        this.clearExtraInformation = clearExtraInformation;
    }
}