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.comparator; 21 22 23 import java.util.Comparator; 24 25 26 /** 27 * Compares booleans 28 * 29 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 30 */ 31 public class BooleanComparator implements Comparator<Boolean> 32 { 33 /** A static instance of a BooleanComparator */ 34 public static final BooleanComparator INSTANCE = new BooleanComparator(); 35 36 /** 37 * A private constructor of the BooleanComparator class 38 */ 39 private BooleanComparator() 40 { 41 } 42 43 44 /** 45 * Compare two booleans. 46 * 47 * @param boolean1 First boolean 48 * @param boolean2 Second boolean 49 * @return 1 if boolean1 > boolean2, 0 if boolean1 == boolean2, -1 if boolean1 < boolean2 50 */ 51 public int compare( Boolean boolean1, Boolean boolean2 ) 52 { 53 if ( boolean1 == boolean2 ) 54 { 55 return 0; 56 } 57 58 if ( boolean1 == null ) 59 { 60 return -1; 61 } 62 63 if ( boolean2 == null ) 64 { 65 return 1; 66 } 67 68 return boolean1.compareTo( boolean2 ); 69 } 70 }