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 import org.apache.directory.shared.ldap.schema.LdapComparator;
023 import org.slf4j.Logger;
024 import org.slf4j.LoggerFactory;
025
026
027 /**
028 * A class for the BooleanComparator matchingRule (RFC 4517, par. 4.2.2)
029 *
030 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
031 * @version $Rev: 437007 $
032 */
033 public class BooleanComparator extends LdapComparator<String>
034 {
035 /** A logger for this class */
036 private static final Logger LOG = LoggerFactory.getLogger( BooleanComparator.class );
037
038 /** The serialVersionUID */
039 private static final long serialVersionUID = 1L;
040
041 /**
042 * The BooleanComparator constructor. Its OID is the BooleanMatch matching
043 * rule OID.
044 */
045 public BooleanComparator( String oid )
046 {
047 super( oid );
048 }
049
050 /**
051 * Implementation of the Compare method
052 */
053 public int compare( String b1, String b2 )
054 {
055 LOG.debug( "comparing boolean objects '{}' with '{}'", b1, b2 );
056
057 // First, shortcut the process by comparing
058 // references. If they are equals, then o1 and o2
059 // reference the same object
060 if ( b1 == b2 )
061 {
062 return 0;
063 }
064
065 // Then, deal with one of o1 or o2 being null
066 // Both can't be null, because then they would
067 // have been catched by the previous test
068 if ( ( b1 == null ) || ( b2 == null ) )
069 {
070 return ( b1 == null ? -1 : 1 );
071 }
072
073 // The boolean should have been stored as 'TRUE' or 'FALSE'
074 // into the server, and the compare method will be called
075 // with normalized booleans, so no need to uppercase them.
076 // We don't need to check the assertion value, because we
077 // are dealing with booleans.
078 return ( b1.equals( "TRUE" ) ? 1 : -1 );
079 }
080 }