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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.directory.server.core.interceptor.context;
21  
22  
23  import org.apache.directory.server.core.CoreSession;
24  import org.apache.directory.shared.ldap.name.LdapDN;
25  
26  
27  /**
28   * An EmptySuffix context used for Interceptors. It contains no data, and mask
29   * the DN in AbstractOperationContext
30   *
31   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
32   * @version $Rev$, $Date$
33   */
34  public abstract class EmptyOperationContext extends AbstractOperationContext
35  {
36      /**
37       * Creates a new instance of EmptyOperationContext.
38       */
39      public EmptyOperationContext( CoreSession session )
40      {
41          super( session, LdapDN.EMPTY_LDAPDN );
42      }
43      
44  
45      /**
46       * Set the context DN
47       *
48       * @param dn The DN to set
49       */
50      public void setDn( LdapDN dn )
51      {
52          if ( dn.equals( LdapDN.EMPTY_LDAPDN ) )
53          {
54              return;
55          }
56          
57          throw new UnsupportedOperationException( 
58              "Cannot set the empty operation context to anything other than the EmptyDN" );
59      }
60  
61      
62      /**
63       * @see Object#toString()
64       */
65      public String toString()
66      {
67          return "EmptyOperationContext";
68      }
69  }