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RNGOM is an open-source Java library for parsing RELAX NG grammars.

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package org.kohsuke.rngom.xml.util;

import java.io.UnsupportedEncodingException;

public abstract class EncodingMap {
  private static final String[] aliases = {
    "UTF-8", "UTF8",
    "UTF-16", "Unicode",
    "UTF-16BE", "UnicodeBigUnmarked",
    "UTF-16LE", "UnicodeLittleUnmarked",
    "US-ASCII", "ASCII",
    "TIS-620", "TIS620"
  };
      
  static public String getJavaName(String enc) {
    try {
      "x".getBytes(enc);
    }
    catch (UnsupportedEncodingException e) {
      for (int i = 0; i < aliases.length; i += 2) {
	if (enc.equalsIgnoreCase(aliases[i])) {
	  try {
	    "x".getBytes(aliases[i + 1]);
	    return aliases[i + 1];
	  }
	  catch (UnsupportedEncodingException e2) {}
	}
      }
    }
    return enc;
  }

  static public void main(String[] args) {
    System.err.println(getJavaName(args[0]));
  }
}