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.api.ldap.model.schema.comparators;
021
022
023import org.apache.directory.api.ldap.model.schema.LdapComparator;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027
028/**
029 * A class for the BooleanComparator matchingRule (RFC 4517, par. 4.2.2)
030 * 
031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032 */
033public class BooleanComparator extends LdapComparator<String>
034{
035    /** The serial version UID */
036    private static final long serialVersionUID = 2L;
037
038    /** A logger for this class */
039    private static final Logger LOG = LoggerFactory.getLogger( BooleanComparator.class );
040
041
042    /**
043     * The BooleanComparator constructor. Its OID is the BooleanMatch matching
044     * rule OID.
045     */
046    public BooleanComparator( String oid )
047    {
048        super( oid );
049    }
050
051
052    /**
053     * Implementation of the Compare method
054     */
055    public int compare( String b1, String b2 )
056    {
057        LOG.debug( "comparing boolean objects '{}' with '{}'", b1, b2 );
058
059        // First, shortcut the process by comparing
060        // references. If they are equals, then o1 and o2
061        // reference the same object
062        if ( b1 == b2 )
063        {
064            return 0;
065        }
066
067        // Then, deal with one of o1 or o2 being null
068        // Both can't be null, because then they would 
069        // have been catched by the previous test
070        if ( ( b1 == null ) || ( b2 == null ) )
071        {
072            return ( b1 == null ? -1 : 1 );
073        }
074
075        // The boolean should have been stored as 'TRUE' or 'FALSE'
076        // into the server, and the compare method will be called
077        // with normalized booleans, so no need to upper case them.
078        // We don't need to check the assertion value, because we
079        // are dealing with booleans.
080        boolean boolean1 = Boolean.valueOf( b1 );
081        boolean boolean2 = Boolean.valueOf( b2 );
082
083        if ( boolean1 == boolean2 )
084        {
085            return 0;
086        }
087
088        return ( boolean1 ? 1 : -1 );
089    }
090}