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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.event;
21  
22  
23  import javax.naming.NamingException;
24  
25  import org.apache.directory.server.core.entry.ServerEntry;
26  import org.apache.directory.shared.ldap.filter.ExprNode;
27  import org.apache.directory.shared.ldap.filter.ScopeNode;
28  import org.apache.directory.shared.ldap.name.LdapDN;
29  
30  
31  /**
32   * Evaluates ScopeNode assertions on candidates.
33   * 
34   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
35   * @version $Rev: 666516 $
36   */
37  public class ScopeEvaluator implements Evaluator
38  {
39      public ScopeEvaluator()
40      {
41      }
42  
43  
44      /**
45       * @see Evaluator#evaluate(ExprNode , String, ServerEntry)
46       */
47      public boolean evaluate( ExprNode node, String dn, ServerEntry record ) throws NamingException
48      {
49          ScopeNode snode = ( ScopeNode ) node;
50  
51          switch ( snode.getScope() )
52          {
53              case OBJECT:
54                  return dn.equals( snode.getBaseDn() );
55              
56              case ONELEVEL:
57                  if ( dn.endsWith( snode.getBaseDn() ) )
58                  {
59                      LdapDN candidateDn = new LdapDN( dn );
60                      LdapDN scopeDn = new LdapDN( snode.getBaseDn() );
61                      return ( scopeDn.size() + 1 ) == candidateDn.size();
62                  }
63              
64              case SUBTREE:
65                  return dn.endsWith( snode.getBaseDn() );
66              
67              default:
68                  throw new NamingException( "Unrecognized search scope!" );
69          }
70      }
71  }