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; 21 22 23 import java.util.Comparator; 24 25 26 /** 27 * A comparator for the RevisionName class 28 * 29 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 30 */ 31 /* no qualifier*/class NameRevisionComparator implements Comparator<NameRevision> 32 { 33 /** 34 * {@inheritDoc} 35 */ 36 public int compare( NameRevision rn1, NameRevision rn2 ) 37 { 38 if ( rn1 == rn2 ) 39 { 40 return 0; 41 } 42 43 // First compare the name 44 int comp = rn1.getName().compareTo( rn2.getName() ); 45 46 if ( comp < 0 ) 47 { 48 return -1; 49 } 50 else if ( comp > 0 ) 51 { 52 return 1; 53 } 54 55 if ( rn1.getRevision() < rn2.getRevision() ) 56 { 57 return -1; 58 } 59 else if ( rn1.getRevision() > rn2.getRevision() ) 60 { 61 return 1; 62 } 63 64 // The name are equal : check the revision 65 if ( rn1.getRevision() < rn2.getRevision() ) 66 { 67 return -1; 68 } 69 else if ( rn1.getRevision() > rn2.getRevision() ) 70 { 71 return 1; 72 } 73 74 return 0; 75 } 76 }