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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.mavibot.btree.memory;
21  
22  
23  import org.apache.directory.mavibot.btree.Tuple;
24  
25  
26  /**
27   * The result of an delete operation, when the key to delete is not present in the tree.
28   * 
29   * @param <K> The type for the Key
30   * @param <V> The type for the stored value
31  
32   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
33   */
34  /* No qualifier */class NotPresentResult<K, V> extends AbstractResult<K, V> implements DeleteResult<K, V>
35  {
36      /** The unique instance for this class */
37      @SuppressWarnings("rawtypes")
38      /* No qualifier */static final NotPresentResult NOT_PRESENT = new NotPresentResult();
39  
40  
41      /**
42       * A private void constructor, as we won't have any other instance.
43       */
44      private NotPresentResult()
45      {
46          // Do nothing
47      }
48  
49  
50      /**
51       * {@inheritDoc}
52       */
53      public Page<K, V> getModifiedPage()
54      {
55          return null;
56      }
57  
58  
59      /**
60       * {@inheritDoc}
61       */
62      public Tuple<K, V> getRemovedElement()
63      {
64          return null;
65      }
66  
67  
68      /**
69       * {@inheritDoc}
70       */
71      public K getNewLeftMost()
72      {
73          return null;
74      }
75  }