/**
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.portal.resource;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import org.exoplatform.commons.utils.CharEncoder;
import org.exoplatform.commons.utils.CharsetCharEncoder;
/**
* A codec for names. It is a modified version of the percent encoding algorithm that translates underscores to their percent
* counterpart and slash to underscores. Therefore slash chars are never seen as the %2F string as it can cause some issues on
* tomcat when it is used in an URI.
*
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
class Codec {
private Codec() {
}
private static final char[][] table = new char[256][];
static {
char[] a = "0123456789ABCDEF".toCharArray();
for (int b = 0; b < 256; b++) {
int b1 = (b & 0xF0) >> 4;
int b2 = b & 0x0F;
table[b] = new char[] { a[b1], a[b2] };
}
}
public static String decode(String s) {
try {
s = s.replace("_", "%2F");
return URLDecoder.decode(s, "UTF8");
} catch (UnsupportedEncodingException e) {
throw new Error(e);
}
}
public static void encode(Appendable appendable, String s) throws IOException {
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (Character.isLetter(c)) {
appendable.append(c);
} else {
switch (c) {
case 'A':
case '.':
case '-':
case '*':
appendable.append(c);
break;
case ' ':
appendable.append('+');
break;
case '/':
appendable.append('_');
break;
default:
CharEncoder encoder = CharsetCharEncoder.getUTF8();
byte[] bytes = encoder.encode(c);
appendable.append('%');
for (byte b : bytes) {
for (char cc : table[b]) {
appendable.append(cc);
}
}
}
}
}
}
}