/****************************************************************************
* Copyright (C) 2012 ecsec GmbH.
* All rights reserved.
* Contact: ecsec GmbH (info@ecsec.de)
*
* This file is part of the Open eCard App.
*
* GNU General Public License Usage
* This file may be used under the terms of the GNU General Public
* License version 3.0 as published by the Free Software Foundation
* and appearing in the file LICENSE.GPL included in the packaging of
* this file. Please review the following information to ensure the
* GNU General Public License version 3.0 requirements will be met:
* http://www.gnu.org/copyleft/gpl.html.
*
* Other Usage
* Alternatively, this file may be used in accordance with the terms
* and conditions contained in a signed written agreement between
* you and ecsec GmbH.
*
***************************************************************************/
package org.openecard.common.util;
import java.util.Comparator;
/**
* Comparator class for byte arrays.
* Makes it possible to use byte arrays as keys in sorted data structures.
*
* @author Tobias Wich <tobias.wich@ecsec.de>
*/
public class ByteComparator implements Comparator<byte[]> {
@Override
public int compare(byte[] o1, byte[] o2) {
if (o1 == o2) {
return 0;
}
if (o1 == null) {
return -1;
}
if (o2 == null) {
return 1;
}
if (o1.length != o2.length) {
return o1.length - o2.length;
}
for (int i = 0; i < o1.length; i++) {
// use int so no overflow is possible
int b1 = o1[i];
int b2 = o2[i];
if (b1 != b2) {
return b1 - b2;
}
}
// equal arrays
return 0;
}
}