/*
*
*/
package com.damnhandy.uri.template;
import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.BitSet;
import com.damnhandy.uri.template.impl.UriEncodingException;
/**
* <p>
* A light-weight utility class for applying encoding to values that are applied to
* expression values.
* </p>
*
* @author <a href="ryan@damnhandy.com">Ryan J. McDonough</a>
* @version $Revision: 1.1 $
*/
public final class UriUtil
{
protected static final char[] GENERAL_DELIM_CHARS = {':', '/', ',', '?', '#', '[', ']', '@'};
protected static final char[] SUB_DELIMS_CHARS = {'!', '$', '&', '\'', '(', ')', '*', '+', ',', ';', '='};
private static final BitSet RESERVED;
private static final BitSet ESCAPE_CHARS;
static
{
RESERVED = new BitSet();
for (int i = 0; i < GENERAL_DELIM_CHARS.length; i++)
{
RESERVED.set(GENERAL_DELIM_CHARS[i]);
}
RESERVED.set(' ');
RESERVED.set('%');
for (int i = 0; i < SUB_DELIMS_CHARS.length; i++)
{
RESERVED.set(SUB_DELIMS_CHARS[i]);
}
ESCAPE_CHARS = new BitSet();
ESCAPE_CHARS.set('<');
ESCAPE_CHARS.set('>');
ESCAPE_CHARS.set('%');
ESCAPE_CHARS.set('\"');
ESCAPE_CHARS.set('{');
ESCAPE_CHARS.set('}');
ESCAPE_CHARS.set('|');
ESCAPE_CHARS.set('\\');
ESCAPE_CHARS.set('^');
ESCAPE_CHARS.set('[');
ESCAPE_CHARS.set(']');
ESCAPE_CHARS.set('`');
}
private UriUtil()
{
}
/**
*
*
* @param source
* @return
*/
public static String encodeFragment(String sourceValue)
{
return encode(sourceValue, ESCAPE_CHARS);
}
/**
*
*
* @param source
* @return
*/
public static String encode(String sourceValue)
{
return encode(sourceValue, RESERVED);
}
/**
*
*
* @param soureValue
* @param chars
* @return
* @throws UriEncodingException
*/
private static String encode(String sourceValue, BitSet chars) throws UriEncodingException
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
try
{
byte[] source = sourceValue.getBytes(Charset.forName("UTF-8"));
for (int i = 0; i < source.length; i++)
{
byte c = source[i];
if (chars.get(c) || c <= 0x20)
{
out.write('%');
char hex1 = Character.toUpperCase(Character.forDigit((c >> 4) & 0xF, 16));
char hex2 = Character.toUpperCase(Character.forDigit(c & 0xF, 16));
out.write(hex1);
out.write(hex2);
}
else
{
out.write(c);
}
}
return new String(out.toByteArray(), "UTF-8");
}
catch (UnsupportedEncodingException e)
{
throw new UriEncodingException(e);
}
}
}