old_trunk/core/src/main/java/org/apache/directory/server/core/interceptor/context/EmptyOperationContext.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.directory.server.core.interceptor.context;

import org.apache.directory.server.schema.registries.Registries;
import org.apache.directory.shared.ldap.name.LdapDN;

/**
 * An EmptySuffix context used for Interceptors. It contains no data, and mask
 * the DN in AbstractOperationContext
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 * @version $Rev$, $Date$
 */
public class EmptyOperationContext extends AbstractOperationContext
{
    /**
     * Creates a new instance of EmptyOperationContext.
     */
    public EmptyOperationContext( Registries registries )
    {
        super( registries, LdapDN.EMPTY_LDAPDN );
    }
    

    /**
     * Set the context DN
     *
     * @param dn The DN to set
     */
    public void setDn( LdapDN dn )
    {
        if ( dn.equals( LdapDN.EMPTY_LDAPDN ) )
        {
            return;
        }
        
        throw new UnsupportedOperationException( 
            "Cannot set the empty operation context to anything other than the EmptyDN" );
    }

    
    /**
     * @see Object#toString()
     */
    public String toString()
    {
        return "EmptyOperationContext";
    }
}