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.comparator; 021 022 023import java.util.Comparator; 024 025 026/** 027 * Compares Longs 028 * 029 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 030 */ 031public class LongComparator implements Comparator<Long> 032{ 033 /** A static instance of a LongComparator */ 034 public static final LongComparator INSTANCE = new LongComparator(); 035 036 /** 037 * A private constructor of the BooleanArrayComparator class 038 */ 039 private LongComparator() 040 { 041 } 042 /** 043 * Compare two longs. 044 * 045 * @param long1 First long 046 * @param long2 Second long 047 * @return 1 if long1 > long2, 0 if long1 == long2, -1 if long1 < long2 048 */ 049 public int compare( Long long1, Long long2 ) 050 { 051 if ( long1 == long2 ) 052 { 053 return 0; 054 } 055 056 if ( long1 == null ) 057 { 058 if ( long2 == null ) 059 { 060 return 0; 061 } 062 else 063 { 064 return -1; 065 } 066 } 067 else 068 { 069 if ( long2 == null ) 070 { 071 return 1; 072 } 073 else 074 { 075 if ( long1 < long2 ) 076 { 077 return -1; 078 } 079 else if ( long1 > long2 ) 080 { 081 return 1; 082 } 083 else 084 { 085 return 0; 086 } 087 } 088 } 089 } 090}