1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 /** 19 * @author Alexander V. Esin 20 * @version $Revision$ 21 */ 22 23 package org.apache.harmony.security.x501; 24 25 import java.io.Serializable; 26 import java.util.Comparator; 27 import org.apache.harmony.security.utils.ObjectIdentifier; 28 29 /** 30 * AttributeTypeAndValue comparator 31 * 32 */ 33 public class AttributeTypeAndValueComparator implements Comparator, Serializable { 34 35 private static final long serialVersionUID = -1286471842007103132L; 36 37 /** 38 * compares two AttributeTypeAndValues 39 * 40 * @param obj1 41 * first AttributeTypeAndValue 42 * @param obj2 43 * second AttributeTypeAndValue 44 * @return -1 of first AttributeTypeAndValue "less" than second 45 * AttributeTypeAndValue 1 otherwise, 0 if they are equal 46 */ compare(Object obj1, Object obj2)47 public int compare(Object obj1, Object obj2) { 48 if (obj1 == obj2) { 49 return 0; 50 } 51 52 AttributeTypeAndValue atav1 = (AttributeTypeAndValue) obj1; 53 AttributeTypeAndValue atav2 = (AttributeTypeAndValue) obj2; 54 String kw1 = atav1.getType().getName(); 55 String kw2 = atav2.getType().getName(); 56 if (kw1 != null && kw2 == null) { 57 return -1; 58 } 59 if (kw1 == null && kw2 != null) { 60 return 1; 61 } 62 if (kw1 != null && kw2 != null) { 63 return kw1.compareTo(kw2); 64 } 65 66 return compateOids(atav1.getType(), atav2.getType()); 67 } 68 69 /** 70 * compares two Object identifiers 71 * 72 * @param oid1 73 * first OID 74 * @param oid2 75 * second OID 76 * @return -1 of first OID "less" than second OID 1 otherwise, 0 if they are 77 * equal 78 */ compateOids(ObjectIdentifier oid1, ObjectIdentifier oid2)79 private static int compateOids(ObjectIdentifier oid1, ObjectIdentifier oid2) { 80 if (oid1 == oid2) { 81 return 0; 82 } 83 84 int[] ioid1 = oid1.getOid(); 85 int[] ioid2 = oid2.getOid(); 86 int min = ioid1.length < ioid2.length ? ioid1.length : ioid2.length; 87 for (int i = 0; i < min; ++i) { 88 if (ioid1[i] < ioid2[i]) { 89 return -1; 90 } 91 if (ioid1[i] > ioid2[i]) { 92 return 1; 93 } 94 if ((i + 1) == ioid1.length && (i + 1) < ioid2.length) { 95 return -1; 96 } 97 if ((i + 1) < ioid1.length && (i + 1) == ioid2.length) { 98 return 1; 99 } 100 } 101 return 0; 102 } 103 } 104