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 java.io.IOException;
024import java.io.Serializable;
025import java.math.BigInteger;
026
027import org.apache.directory.api.i18n.I18n;
028import org.apache.directory.api.ldap.model.schema.LdapComparator;
029import org.apache.directory.api.ldap.model.schema.PrepareString;
030import org.slf4j.Logger;
031import org.slf4j.LoggerFactory;
032
033
034/**
035 * A class for the integerOrderingMatch matchingRule (RFC 4517, par. 4.2.20)
036 * 
037 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
038 */
039public class IntegerComparator extends LdapComparator<Object> implements Serializable
040{
041    /** The serial version UID */
042    private static final long serialVersionUID = 2L;
043
044    /** A logger for this class */
045    private static final Logger LOG = LoggerFactory.getLogger( IntegerComparator.class );
046
047
048    /**
049     * The IntegerComparator constructor. Its OID is the IntegerOrderingMatch matching
050     * rule OID.
051     */
052    public IntegerComparator( String oid )
053    {
054        super( oid );
055    }
056
057
058    /**
059     * Implementation of the Compare method
060     */
061    public int compare( Object v1, Object v2 )
062    {
063        if ( v1 instanceof String )
064        {
065            return compare( ( String ) v1, ( String ) v2 );
066        }
067        else
068        {
069            return compare( ( Long ) v1, ( Long ) v2 );
070        }
071    }
072
073
074    /**
075     * Implementation of the Compare method
076     */
077    private int compare( Long backendValue, Long assertValue )
078    {
079        LOG.debug( "comparing Integer objects '{}' with '{}'", backendValue, assertValue );
080
081        // First, shortcut the process by comparing
082        // references. If they are equals, then o1 and o2
083        // reference the same object
084        if ( backendValue == assertValue )
085        {
086            return 0;
087        }
088
089        // Then, deal with one of o1 or o2 being null
090        // Both can't be null, because then they would
091        // have been caught by the previous test
092        if ( ( backendValue == null ) || ( assertValue == null ) )
093        {
094            return ( backendValue == null ? -1 : 1 );
095        }
096
097        return backendValue.compareTo( assertValue );
098    }
099
100
101    /**
102     * Implementation of the Compare method
103     */
104    private int compare( String backendValue, String assertValue )
105    {
106        LOG.debug( "comparing Integer objects '{}' with '{}'", backendValue, assertValue );
107
108        // First, shortcut the process by comparing
109        // references. If they are equals, then o1 and o2
110        // reference the same object
111        if ( backendValue == assertValue )
112        {
113            return 0;
114        }
115
116        // Then, deal with one of o1 or o2 being null
117        // Both can't be null, because then they would
118        // have been caught by the previous test
119        if ( ( backendValue == null ) || ( assertValue == null ) )
120        {
121            return ( backendValue == null ? -1 : 1 );
122        }
123
124        // Both objects must be stored as String for numeric.
125        // But we need to normalize the values first.
126        try
127        {
128            backendValue = PrepareString.normalize( backendValue, PrepareString.StringType.NUMERIC_STRING );
129        }
130        catch ( IOException ioe )
131        {
132            throw new IllegalArgumentException( I18n.err( I18n.ERR_04224, backendValue ), ioe );
133        }
134        try
135        {
136            assertValue = PrepareString.normalize( assertValue, PrepareString.StringType.NUMERIC_STRING );
137        }
138        catch ( IOException ioe )
139        {
140            throw new IllegalArgumentException( I18n.err( I18n.ERR_04224, assertValue ), ioe );
141        }
142
143        BigInteger b1 = new BigInteger( backendValue );
144        BigInteger b2 = new BigInteger( assertValue );
145
146        return b1.compareTo( b2 );
147    }
148}