Compare two byte[] for differences, either may be null
import java.util.Collection;
import java.util.Iterator;
/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/util/branches/sakai_2-5-4/util-util/util/src/java/org/sakaiproject/util/StringUtil.java $
* $Id: StringUtil.java 34934 2007-09-10 22:52:23Z lance@indiana.edu $
***********************************************************************************
*
* Copyright (c) 2003, 2004, 2005, 2006 The Sakai Foundation.
*
* Licensed under the Educational Community License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.opensource.org/licenses/ecl1.php
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**********************************************************************************/
/**
* <p>
* StringUtil collects together some string utility classes.
* </p>
*/
public class StringUtil
{
/**
* Compare two byte[] for differences, either may be null
*
* @param a
* One byte[].
* @param b
* The other byte[].
* @return true if the byte[]s are different, false if they are the same.
*/
public static boolean different(byte[] a, byte[] b)
{
// if both null, they are the same
if ((a == null) && (b == null)) return false;
// if either are null (they both are not), they are different
if ((a == null) || (b == null)) return true;
// if the lengths are different, they are different
if (a.length != b.length) return true;
// now we know neither are null, so compare, item for item (order counts)
for (int i = 0; i < a.length; i++)
{
if (a[i] != b[i]) return true;
}
// they are NOT different!
return false;
}
}
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