001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.directory.mavibot.btree.exception; 021 022 023/** 024 * An exception thrown when we can't find a key in the BTree. 025 * 026 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 027 */ 028public class KeyNotFoundException extends Exception 029{ 030 /** The serial version UUID */ 031 private static final long serialVersionUID = 1L; 032 033 /** A static Exception used to avoid creating a new one every time */ 034 public static final KeyNotFoundException INSTANCE = new KeyNotFoundException( 035 "Cannot find an entry associated with this key" ); 036 037 038 /** 039 * Creates a new instance of KeyNotFoundException. 040 */ 041 public KeyNotFoundException() 042 { 043 } 044 045 046 /** 047 * Creates a new instance of KeyNotFoundException. 048 * 049 * @param explanation The message associated with the exception 050 */ 051 public KeyNotFoundException( String explanation ) 052 { 053 super( explanation ); 054 } 055 056 057 /** 058 * Creates a new instance of KeyNotFoundException. 059 */ 060 public KeyNotFoundException( Throwable cause ) 061 { 062 super( cause ); 063 } 064 065 066 /** 067 * Creates a new instance of KeyNotFoundException. 068 * 069 * @param explanation The message associated with the exception 070 * @param cause The root cause for this exception 071 */ 072 public KeyNotFoundException( String explanation, Throwable cause ) 073 { 074 super( explanation, cause ); 075 } 076}