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.shared.ldap.model.schema.comparators; 021 022 023import org.apache.directory.shared.asn1.util.Oid; 024import org.apache.directory.shared.ldap.model.schema.LdapComparator; 025import org.apache.directory.shared.util.Chars; 026import org.apache.directory.shared.util.Strings; 027import org.slf4j.Logger; 028import org.slf4j.LoggerFactory; 029 030 031/** 032 * A comparator for Comparators. We compare the OIDs 033 * 034 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 035 */ 036public class ObjectIdentifierFirstComponentComparator extends LdapComparator<String> 037{ 038 /** The serial version UID */ 039 private static final long serialVersionUID = 2L; 040 041 /** A logger for this class */ 042 private static final Logger LOG = LoggerFactory.getLogger( ObjectIdentifierFirstComponentComparator.class ); 043 044 /** 045 * The ObjectIdentifierFirstComponentComparator constructor. Its OID is the 046 * ObjectIdentifierFirstComponentMatch matching rule OID. 047 */ 048 public ObjectIdentifierFirstComponentComparator( String oid ) 049 { 050 super( oid ); 051 } 052 053 054 /** 055 * Get the OID from the SchemaObject description 056 */ 057 private String getNumericOid( String s ) 058 { 059 // Get the OID from the strings now 060 int pos = 0; 061 062 if ( !Strings.isCharASCII( s, pos++, '(' ) ) 063 { 064 return null; 065 } 066 067 while ( Strings.isCharASCII( s, pos, ' ' ) ) 068 { 069 pos++; 070 } 071 072 int start = pos; 073 074 while ( Chars.isDigit(s, pos) || Strings.isCharASCII( s, pos, '.' ) ) 075 { 076 pos++; 077 } 078 079 String numericOid = s.substring( start, pos ); 080 081 if ( Oid.isOid(numericOid) ) 082 { 083 return numericOid; 084 } 085 else 086 { 087 return null; 088 } 089 } 090 091 /** 092 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) 093 */ 094 public int compare( String s1, String s2 ) 095 { 096 LOG.debug( "comparing ObjectIdentifierFirstComponent objects '{}' with '{}'", s1, s2 ); 097 098 // ------------------------------------------------------------------- 099 // Handle some basis cases 100 // ------------------------------------------------------------------- 101 if ( s1 == null ) 102 { 103 return ( s2 == null ) ? 0 : -1; 104 } 105 106 if ( s2 == null ) 107 { 108 return -1; 109 } 110 111 // Let's try to avoid a parse. 112 if ( s1.equals( s2 ) ) 113 { 114 return 0; 115 } 116 117 // Get the OID from the strings now 118 String oid1 = getNumericOid( s1 ); 119 120 if ( oid1 == null ) 121 { 122 return -1; 123 } 124 125 String oid2 = getNumericOid( s2 ); 126 127 if ( oid2 == null ) 128 { 129 return -1; 130 } 131 132 if ( oid1.equals( oid2 ) ) 133 { 134 return 0; 135 } 136 else 137 { 138 return -1; 139 } 140 } 141}