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.exception;
21
22
23 /**
24 * An exception thrown when we can't find a key in the BTree.
25 *
26 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
27 */
28 public class KeyNotFoundException extends Exception
29 {
30 /** The serial version UUID */
31 private static final long serialVersionUID = 1L;
32
33 /** A static Exception used to avoid creating a new one every time */
34 public static final KeyNotFoundException INSTANCE = new KeyNotFoundException(
35 "Cannot find an entry associated with this key" );
36
37
38 /**
39 * Creates a new instance of KeyNotFoundException.
40 */
41 public KeyNotFoundException()
42 {
43 }
44
45
46 /**
47 * Creates a new instance of KeyNotFoundException.
48 *
49 * @param explanation The message associated with the exception
50 */
51 public KeyNotFoundException( String explanation )
52 {
53 super( explanation );
54 }
55
56
57 /**
58 * Creates a new instance of KeyNotFoundException.
59 */
60 public KeyNotFoundException( Throwable cause )
61 {
62 super( cause );
63 }
64
65
66 /**
67 * Creates a new instance of KeyNotFoundException.
68 *
69 * @param explanation The message associated with the exception
70 * @param cause The root cause for this exception
71 */
72 public KeyNotFoundException( String explanation, Throwable cause )
73 {
74 super( explanation, cause );
75 }
76 }