001 /**
002 * JDBM LICENSE v1.00
003 *
004 * Redistribution and use of this software and associated documentation
005 * ("Software"), with or without modification, are permitted provided
006 * that the following conditions are met:
007 *
008 * 1. Redistributions of source code must retain copyright
009 * statements and notices. Redistributions must also contain a
010 * copy of this document.
011 *
012 * 2. Redistributions in binary form must reproduce the
013 * above copyright notice, this list of conditions and the
014 * following disclaimer in the documentation and/or other
015 * materials provided with the distribution.
016 *
017 * 3. The name "JDBM" must not be used to endorse or promote
018 * products derived from this Software without prior written
019 * permission of Cees de Groot. For written permission,
020 * please contact cg@cdegroot.com.
021 *
022 * 4. Products derived from this Software may not be called "JDBM"
023 * nor may "JDBM" appear in their names without prior written
024 * permission of Cees de Groot.
025 *
026 * 5. Due credit should be given to the JDBM Project
027 * (http://jdbm.sourceforge.net/).
028 *
029 * THIS SOFTWARE IS PROVIDED BY THE JDBM PROJECT AND CONTRIBUTORS
030 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
031 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
032 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
033 * CEES DE GROOT OR ANY CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
034 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
035 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
036 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
037 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
038 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
039 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
040 * OF THE POSSIBILITY OF SUCH DAMAGE.
041 *
042 * Copyright 2001 (C) Alex Boisvert. All Rights Reserved.
043 * Contributions are Copyright (C) 2001 by their associated contributors.
044 *
045 */
046
047 package jdbm.helper;
048
049 import java.io.Serializable;
050 import java.util.Comparator;
051
052 import org.apache.directory.server.i18n.I18n;
053
054 /**
055 * Comparator for Integer objects.
056 *
057 * @author <a href="mailto:cdaller@iicm.edu">Christof Dallermassl</a>
058 * @version $Id: IntegerComparator.java,v 1.2 2002/05/31 06:33:20 boisvert Exp $
059 */
060 public final class IntegerComparator
061 implements Comparator, Serializable
062 {
063
064 /**
065 * Version id for serialization.
066 */
067 final static long serialVersionUID = 1L;
068
069
070 /**
071 * Compare two objects.
072 *
073 * @param obj1 First object
074 * @param obj2 Second object
075 * @return a positive integer if obj1 > obj2, 0 if obj1 == obj2,
076 * and a negative integer if obj1 < obj2
077 */
078 public int compare( Object obj1, Object obj2 )
079 {
080 if ( obj1 == obj2 ) {
081 return 0;
082 }
083
084 if ( obj1 == null ) {
085 throw new IllegalArgumentException( I18n.err( I18n.ERR_525 ) );
086 }
087
088 if ( obj2 == null ) {
089 throw new IllegalArgumentException( I18n.err( I18n.ERR_526 ) );
090 }
091
092 // complicated to avoid usage of Integer.compareTo, as this
093 // method is Java 1.2 only!
094 int int1 = ( (Integer) obj1 ).intValue();
095 int int2 = ( (Integer) obj2 ).intValue();
096 if ( int1 == int2 ) {
097 return 0;
098 }
099
100 if ( int1 < int2 ) {
101 return -1;
102 } else {
103 return 1;
104 }
105 }
106
107 }