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/* Copyright 2004 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.runas;

import org.acegisecurity.Authentication;
import org.acegisecurity.ConfigAttribute;
import org.acegisecurity.ConfigAttributeDefinition;
import org.acegisecurity.RunAsManager;


/**
 * Implementation of a {@link RunAsManager} that does nothing.
 * 
 * 
 * This class should be used if you do not require run-as authenticaiton
 * replacement functionality.
 * 
 *
 * @author Ben Alex
 * @version $Id: NullRunAsManager.java,v 1.2 2005/11/17 00:55:51 benalex Exp $
 */
public class NullRunAsManager implements RunAsManager {
    //~ Methods ================================================================

    public Authentication buildRunAs(Authentication authentication,
        Object object, ConfigAttributeDefinition config) {
        return null;
    }

    public boolean supports(ConfigAttribute attribute) {
        return false;
    }

    public boolean supports(Class clazz) {
        return true;
    }
}