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/*
JSPWiki - a JSP-based WikiWiki clone.
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
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.
*/
import java.security.SecureRandom;
import java.util.Random;
public class StringUtils
{
/**
* Converts a string from the Unicode representation into something that can be
* embedded in a java properties file. All references outside the ASCII range
* are replaced with \\uXXXX.
*
* @param s The string to convert
* @return the ASCII string
*/
public static String native2Ascii(String s)
{
StringBuffer sb = new StringBuffer();
for(int i = 0; i < s.length(); i++)
{
char aChar = s.charAt(i);
if ((aChar < 0x0020) || (aChar > 0x007e))
{
sb.append('\\');
sb.append('u');
sb.append(toHex((aChar >> 12) & 0xF));
sb.append(toHex((aChar >> 8) & 0xF));
sb.append(toHex((aChar >> 4) & 0xF));
sb.append(toHex( aChar & 0xF));
}
else
{
sb.append(aChar);
}
}
return sb.toString();
}
private static char toHex(int nibble)
{
final char[] hexDigit =
{
'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
};
return hexDigit[nibble & 0xF];
}
}
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