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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.xdbm.search.impl;
21  
22  
23  import org.apache.directory.shared.ldap.filter.NotNode;
24  import org.apache.directory.shared.ldap.filter.ExprNode;
25  import org.apache.directory.server.xdbm.IndexEntry;
26  import org.apache.directory.server.xdbm.search.Evaluator;
27  import org.apache.directory.server.core.entry.ServerEntry;
28  
29  
30  /**
31   * An Evaluator for logical negation (NOT) expressions.
32   *
33   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
34   * @version $$Rev$$
35   */
36  public class NotEvaluator implements Evaluator<NotNode, ServerEntry>
37  {
38      private final NotNode node;
39      private final Evaluator<? extends ExprNode,ServerEntry> childEvaluator;
40  
41  
42      public NotEvaluator( NotNode node, Evaluator<? extends ExprNode, ServerEntry> childEvaluator )
43      {
44          this.node = node;
45          this.childEvaluator = childEvaluator;
46      }
47  
48  
49      public boolean evaluate( Long id ) throws Exception
50      {
51          return ! childEvaluator.evaluate( id );
52      }
53  
54  
55      public boolean evaluate( ServerEntry entry ) throws Exception
56      {
57          return ! childEvaluator.evaluate( entry );
58      }
59  
60  
61      public boolean evaluate( IndexEntry<?, ServerEntry> indexEntry ) throws Exception
62      {
63          return ! childEvaluator.evaluate( indexEntry );
64      }
65  
66  
67      public NotNode getExpression()
68      {
69          return node;
70      }
71  }