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 java.io.IOException;
024    import java.math.BigInteger;
025    
026    import org.apache.directory.shared.i18n.I18n;
027    import org.apache.directory.shared.ldap.schema.LdapComparator;
028    import org.apache.directory.shared.ldap.schema.PrepareString;
029    import org.slf4j.Logger;
030    import org.slf4j.LoggerFactory;
031    
032    
033    /**
034     * A class for the integerOrderingMatch matchingRule (RFC 4517, par. 4.2.20)
035     * 
036     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
037     * @version $Rev: 437007 $
038     */
039    public class IntegerOrderingComparator extends LdapComparator<String>
040    {
041        /** A logger for this class */
042        private static final Logger LOG = LoggerFactory.getLogger( IntegerOrderingComparator.class );
043    
044        /** The serialVersionUID */
045        private static final long serialVersionUID = 1L;
046    
047    
048        /**
049         * The IntegerOrderingComparator constructor. Its OID is the IntegerOrderingMatch matching
050         * rule OID.
051         */
052        public IntegerOrderingComparator( String oid )
053        {
054            super( oid );
055        }
056    
057    
058        /**
059         * Implementation of the Compare method
060         */
061        public int compare( String backendValue, String assertValue )
062        {
063            LOG.debug( "comparing IntegerOrdering objects '{}' with '{}'", backendValue, assertValue );
064    
065            // First, shortcut the process by comparing
066            // references. If they are equals, then o1 and o2
067            // reference the same object
068            if ( backendValue == assertValue )
069            {
070                return 0;
071            }
072    
073            // Then, deal with one of o1 or o2 being null
074            // Both can't be null, because then they would 
075            // have been caught by the previous test
076            if ( ( backendValue == null ) || ( assertValue == null ) )
077            {
078                return ( backendValue == null ? -1 : 1 );
079            }
080    
081            // Both objects must be stored as String for numeric.
082            // But we need to normalize the values first.
083            try
084            {
085                backendValue = PrepareString.normalize( backendValue, PrepareString.StringType.NUMERIC_STRING );
086            }
087            catch ( IOException e )
088            {
089                throw new IllegalArgumentException( I18n.err( I18n.ERR_04224, backendValue ) );
090            }
091            try
092            {
093                assertValue = PrepareString.normalize( assertValue, PrepareString.StringType.NUMERIC_STRING );
094            }
095            catch ( IOException e )
096            {
097                throw new IllegalArgumentException( I18n.err( I18n.ERR_04224, assertValue ) );
098            }
099    
100            BigInteger b1 = new BigInteger( backendValue );
101            BigInteger b2 = new BigInteger( assertValue );
102            return b1.compareTo( b2 );
103        }
104    }