/*
* Copyright (C) 2011 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.web.controller.router;
import java.io.IOException;
import java.util.BitSet;
import org.exoplatform.commons.utils.CharEncoder;
import org.exoplatform.commons.utils.CharsetCharEncoder;
import org.gatein.common.io.UndeclaredIOException;
/**
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
*/
public final class PercentEncoding {
/** . */
private static final CharEncoder encoder = CharsetCharEncoder.getUTF8();
/** . */
private static final char[] ALPHABET = "0123456789ABCDEF".toCharArray();
/** Path segment. */
public static final PercentEncoding PATH_SEGMENT;
static {
BitSet allowed = new BitSet();
// Unreserved
for (char c = 'A'; c <= 'Z'; c++) {
allowed.set(c);
}
for (char c = 'a'; c <= 'z'; c++) {
allowed.set(c);
}
for (char c = '0'; c <= '9'; c++) {
allowed.set(c);
}
allowed.set('_');
allowed.set('.');
allowed.set('-');
allowed.set('~');
// sub-delims
allowed.set('!');
allowed.set('$');
allowed.set('&');
allowed.set('\'');
allowed.set('(');
allowed.set(')');
allowed.set('*');
allowed.set('+');
allowed.set(',');
allowed.set(';');
allowed.set('=');
// ':' | '@'
allowed.set(':');
allowed.set('@');
//
PATH_SEGMENT = new PercentEncoding(allowed);
}
/** Query params name or value. */
public static final PercentEncoding QUERY_PARAM;
static {
BitSet allowed = new BitSet(128);
for (char c = 'A'; c <= 'Z'; c++) {
allowed.set(c);
}
for (char c = 'a'; c <= 'z'; c++) {
allowed.set(c);
}
for (char c = '0'; c <= '9'; c++) {
allowed.set(c);
}
allowed.set('_');
allowed.set('.');
allowed.set('-');
allowed.set('~');
// sub-delims without ( '&' | '=' )
allowed.set('!');
allowed.set('$');
allowed.set('\'');
allowed.set('(');
allowed.set(')');
allowed.set('*');
allowed.set('+');
allowed.set(',');
allowed.set(';');
// ':' | '@'
allowed.set(':');
allowed.set('@');
// '?' | '/'
allowed.set('?');
allowed.set('/');
//
QUERY_PARAM = new PercentEncoding(allowed);
}
/** . */
private final BitSet allowed;
private PercentEncoding(BitSet allowed) {
this.allowed = allowed;
}
boolean accept(char c) {
return c < allowed.length() && allowed.get(c);
}
public void encode(CharSequence s, Appendable appendable) throws IOException {
for (int len = s.length(), i = 0; i < len; i++) {
char c = s.charAt(i);
encode(c, appendable);
}
}
public String encode(CharSequence s) {
try {
StringBuilder sb = new StringBuilder(s.length());
encode(s, sb);
return sb.toString();
} catch (IOException e) {
throw new UndeclaredIOException(e);
}
}
public void encode(char c, Appendable appendable) throws IOException {
if (accept(c)) {
appendable.append(c);
} else {
byte[] bytes = encoder.encode(c);
for (byte b : bytes) {
appendable.append('%');
appendable.append(ALPHABET[(b & 0xF0) >> 4]);
appendable.append(ALPHABET[b & 0xF]);
}
}
}
}