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 */
020 package org.apache.directory.shared.ldap.schema.comparators;
021
022
023 import org.apache.directory.shared.asn1.primitives.OID;
024 import org.apache.directory.shared.ldap.schema.LdapComparator;
025 import org.apache.directory.shared.ldap.util.StringTools;
026 import org.slf4j.Logger;
027 import org.slf4j.LoggerFactory;
028
029
030 /**
031 * A comparator for Comparators. We compare the OIDs
032 *
033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
034 * @version $Rev$
035 */
036 public class ObjectIdentifierFirstComponentComparator extends LdapComparator<String>
037 {
038 /** A logger for this class */
039 private static final Logger LOG = LoggerFactory.getLogger( ObjectIdentifierFirstComponentComparator.class );
040
041 /** The serialVersionUID */
042 private static final long serialVersionUID = 1L;
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 ( !StringTools.isCharASCII( s, pos++, '(' ) )
063 {
064 return null;
065 }
066
067 while ( StringTools.isCharASCII( s, pos, ' ' ) )
068 {
069 pos++;
070 }
071
072 int start = pos;
073
074 while ( StringTools.isDigit( s, pos ) || StringTools.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 }