/*
// $Id: XmlaOlap4jShaEncoder.java 315 2010-05-29 00:56:11Z jhyde $
// This software is subject to the terms of the Eclipse Public License v1.0
// Agreement, available at the following URL:
// http://www.eclipse.org/legal/epl-v10.html.
// Copyright (C) 2007-2010 Julian Hyde
// All Rights Reserved.
// You must accept the terms of that agreement to use this software.
*/
package org.olap4j.driver.xmla.cache;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* SHA encoder to create unique hash strings for cache elements.
*
* @author Luc Boudreau
* @version $Id: XmlaOlap4jShaEncoder.java 315 2010-05-29 00:56:11Z jhyde $
*/
class XmlaOlap4jShaEncoder {
private static String convertToHex(byte[] data) {
StringBuilder buf = new StringBuilder();
for (int i = 0; i < data.length; i++) {
int halfbyte = (data[i] >>> 4) & 0x0F;
int two_halfs = 0;
do {
if ((0 <= halfbyte) && (halfbyte <= 9)) {
buf.append((char) ('0' + halfbyte));
} else {
buf.append((char) ('a' + (halfbyte - 10)));
}
halfbyte = data[i] & 0x0F;
} while (two_halfs++ < 1);
}
return buf.toString();
}
public static String encodeSha1(String text) {
MessageDigest md;
try {
md = MessageDigest.getInstance("SHA-1");
} catch (NoSuchAlgorithmException e) {
try {
md = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e1) {
throw new RuntimeException(e1);
}
}
byte[] sha1hash = new byte[40];
md.update(text.getBytes(), 0, text.length());
sha1hash = md.digest();
return convertToHex(sha1hash);
}
}
// End XmlaOlap4jShaEncoder.java