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      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      */
     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      */
     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