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Jing is a validator for RELAX NG and other schema languages. This
project was taken from http://code.google.com/p/jing-trang and
mavenized for inclusion in the Wicket Stuff HTML Validator.
The code was taken from the 20091111 release.
package com.thaiopensource.xml.out;
import java.io.UnsupportedEncodingException;
public class CharRepertoire {
private final byte[] allUnknown = new byte[256];
private final byte[][] charTable = new byte[256][];
private static final byte UNKNOWN = 0;
private static final byte IN = 1;
private static final byte OUT = -1;
private final String enc;
CharRepertoire(String enc) {
this.enc = enc;
for (int i = 0; i < charTable.length; i++)
charTable[i] = allUnknown;
}
public static CharRepertoire getInstance(String enc)
throws UnsupportedEncodingException {
"x".getBytes(enc); // check whether encoding supported
return new CharRepertoire(enc);
}
public final boolean contains(char c) {
byte b = charTable[c >> 8][c & 0xFF];
return b == 0 ? contains1(c) : b > 0;
}
private boolean contains1(char c) {
int i = c >> 8;
if (charTable[i] == allUnknown)
charTable[i] = new byte[256];
if (contains2(c)) {
charTable[i][c & 0xFF] = IN;
return true;
}
else {
charTable[i][c & 0xFF] = OUT;
return false;
}
}
private boolean contains2(char c) {
try {
String s = new String(new String(new char[]{ c }).getBytes(enc), enc);
return s.length() == 1 && s.charAt(0) == c;
}
catch (UnsupportedEncodingException e) {
return false;
}
}
/* For surrogates. */
public final boolean contains(char c1, char c2) {
try {
String s = new String(new String(new char[]{c1, c2}).getBytes(enc), enc);
return s.length() == 2 && s.charAt(0) == c1 && s.charAt(1) == c2;
}
catch (UnsupportedEncodingException e) {
return false;
}
// work around gcj bug (libgcj/9802)
catch (RuntimeException e) {
return false;
}
}
}