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.managed;
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 }