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package de.lmu.ifi.dbs.elki.utilities;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
/**
* Class to wrap various Base64 encoders that could be available.
*
* This is a rather ugly hack; it would maybe have been sensible to just import
* one of the publicly available (and fast) Base64 encoders. The expectation was
* that at some point, Oracle will acutally include a public and fast Base64
* encoder in Java.
*
* @author Erich Schubert
*/
public final class Base64 {
/**
* Instance of sun.misc.BASE64Encoder
*/
private static Object sunj6i;
/**
* Encode method
*/
private static Method sunj6m;
/**
* Instance of java.util.prefs.Base64
*/
private static Object jup6i;
/**
* Encode method
*/
private static Method jup6m;
// Initialize
static {
// Try Java 6
{
try {
Class<?> c = ClassLoader.getSystemClassLoader().loadClass("sun.misc.BASE64Encoder");
sunj6i = c.newInstance();
sunj6m = c.getMethod("encode", byte[].class);
}
catch(Throwable e) {
// de.lmu.ifi.dbs.elki.logging.LoggingUtil.exception(e);
// Ignore.
sunj6i = null;
sunj6m = null;
}
}
// Try private class in Java6 preferences
{
try {
Class<?> c = ClassLoader.getSystemClassLoader().loadClass("java.util.prefs.Base64");
Constructor<?> cons = c.getDeclaredConstructor();
cons.setAccessible(true);
jup6i = cons.newInstance();
jup6m = c.getDeclaredMethod("byteArrayToBase64", byte[].class);
jup6m.setAccessible(true);
}
catch(Throwable e) {
// de.lmu.ifi.dbs.elki.logging.LoggingUtil.exception(e);
// Ignore.
jup6i = null;
jup6m = null;
}
}
if(sunj6i == null && jup6i == null) {
de.lmu.ifi.dbs.elki.logging.LoggingUtil.warning("No usable Base64 encoders detected.");
}
}
/**
* Encode a string as Base64.
*
* @param s Bytes to encode
* @return Result string
*/
public static final String encodeBase64(byte[] s) {
if(jup6i != null && jup6m != null) {
try {
return (String) jup6m.invoke(jup6i, s);
}
catch(Exception e) {
throw new RuntimeException("java.util.prefs.Base64 is not working.");
}
}
if(sunj6i != null && sunj6m != null) {
try {
return (String) sunj6m.invoke(sunj6i, s);
}
catch(Exception e) {
throw new RuntimeException("sun.misc.BASE64Encoder is not working.");
}
}
throw new RuntimeException("No usable Base64 encoder detected.");
}
}
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