/******************************************************************************
* JBoss, a division of Red Hat *
* Copyright 2009, Red Hat Middleware, LLC, and individual *
* contributors as indicated by the @authors tag. See the *
* copyright.txt in the distribution for a full listing of *
* individual contributors. *
* *
* 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.gatein.common.text;
import org.gatein.common.io.UndeclaredIOException;
import org.gatein.common.util.ParameterValidation;
import java.io.IOException;
import java.io.Writer;
/**
* An implementation based on a table for lookups.
*
* @author <a href="mailto:julien@jboss.org">Julien Viet</a>
* @version $Revision: 7228 $
*/
public class FastURLEncoder extends AbstractCharEncoder
{
/** . */
private static final FastURLEncoder DEFAULT_ENCODER = new FastURLEncoder(CharToByteEncoder.Generic.UTF8);
public static FastURLEncoder getUTF8Instance()
{
return DEFAULT_ENCODER;
}
/** . */
private final char[][] table;
/** . */
private static final char MAX = (char)0x10FFFD;
public FastURLEncoder(CharToByteEncoder encoder) throws IllegalArgumentException
{
if (encoder == null)
{
throw new IllegalArgumentException("No encoding provided");
}
//
this.table = new char[MAX + 1][];
//
for (char c = 0; c <= MAX; c++)
{
char[] z;
if (TextTools.isAlphaNumeric(c))
{
z = new char[]{c};
}
else
{
switch (c)
{
case ' ':
z = new char[]{'+'};
break;
case '.':
case '-':
case '*':
case '_':
z = new char[]{c};
break;
default:
byte[] v = encoder.encode(c);
if (v.length > 0)
{
z = new char[v.length * 3];
int index = 0;
for (int i = 0; i < v.length; i++)
{
byte b = v[i];
z[index++] = '%';
z[index++] = TextTools.toHex((b & 0xF0) >> 4);
z[index++] = TextTools.toHex(b & 0x0F);
}
}
else
{
z = null;
}
break;
}
}
table[c] = z;
}
}
public void encode(char c, CharWriter writer)
{
ParameterValidation.throwIllegalArgExceptionIfNull(writer, "CharWriter");
//
char[] z = getEncoding(c);
writer.append(z);
}
private char[] getEncoding(char c)
{
char[] z = table[c];
if (z == null)
{
throw new MalformedInputException("Couldn't find appropriate encoding for '" + c + "'");
}
return z;
}
protected void safeEncode(char[] chars, int off, int len, CharWriter writer)
{
for (int i = off; i < len; i++)
{
char c = chars[i];
char[] z = getEncoding(c);
writer.append(z);
}
}
public void encode(String s, Writer out) throws IllegalArgumentException, UndeclaredIOException
{
ParameterValidation.throwIllegalArgExceptionIfNull(s, "String");
ParameterValidation.throwIllegalArgExceptionIfNull(out, "Writer");
try
{
for (int i = 0; i < s.length(); i++)
{
char c = s.charAt(i);
char[] z = getEncoding(c);
out.write(z);
}
}
catch (IOException e)
{
throw new UndeclaredIOException(e);
}
}
public String toString()
{
return "FastURLEncoder[" + "" + ",[" + 0 + "," + MAX + "]]";
}
}