/*
 ** Java native interface to the Windows Registry API.
 ** 
 ** Authored by Timothy Gerard Endres
 ** <mailto:time@gjt.org>  <http://www.trustice.com>
 ** 
 ** This work has been placed into the public domain.
 ** You may use this work in any way and for any purpose you wish.
 **
 ** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
 ** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
 ** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
 ** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
 ** REDISTRIBUTION OF THIS SOFTWARE. 
 ** 
 */

package com.newatlanta.jni.registry;

import java.text.FieldPosition;
import java.text.Format;
import java.text.ParseException;
import java.text.ParsePosition;

/**
 * The HexNumberFormat class implements the code necessary to format and parse
 * Hexidecimal integer numbers.
 * 
 * @version 3.1.3
 * 
 * @author Timothy Gerard Endres, <a href="mailto:time@ice.com">time@ice.com</a>.
 * @see java.text.NumberFormat
 */

public class HexNumberFormat extends Format {
	private static final long serialVersionUID = 1L;

	static public final String RCS_ID = "$Id: HexNumberFormat.java,v 1.1 2008/05/09 09:49:28 openbd Exp $";

	static public final String RCS_REV = "$Revision: 1.1 $";

	private static char[] lowChars;

	private static char[] uprChars;

	private int count;

	private static char[] hexChars;

	static {
		HexNumberFormat.lowChars = new char[20];
		HexNumberFormat.uprChars = new char[20];

		HexNumberFormat.uprChars[0] = HexNumberFormat.lowChars[0] = '0';
		HexNumberFormat.uprChars[1] = HexNumberFormat.lowChars[1] = '1';
		HexNumberFormat.uprChars[2] = HexNumberFormat.lowChars[2] = '2';
		HexNumberFormat.uprChars[3] = HexNumberFormat.lowChars[3] = '3';
		HexNumberFormat.uprChars[4] = HexNumberFormat.lowChars[4] = '4';
		HexNumberFormat.uprChars[5] = HexNumberFormat.lowChars[5] = '5';
		HexNumberFormat.uprChars[6] = HexNumberFormat.lowChars[6] = '6';
		HexNumberFormat.uprChars[7] = HexNumberFormat.lowChars[7] = '7';
		HexNumberFormat.uprChars[8] = HexNumberFormat.lowChars[8] = '8';
		HexNumberFormat.uprChars[9] = HexNumberFormat.lowChars[9] = '9';
		HexNumberFormat.uprChars[10] = 'A';
		HexNumberFormat.lowChars[10] = 'a';
		HexNumberFormat.uprChars[11] = 'B';
		HexNumberFormat.lowChars[11] = 'b';
		HexNumberFormat.uprChars[12] = 'C';
		HexNumberFormat.lowChars[12] = 'c';
		HexNumberFormat.uprChars[13] = 'D';
		HexNumberFormat.lowChars[13] = 'd';
		HexNumberFormat.uprChars[14] = 'E';
		HexNumberFormat.lowChars[14] = 'e';
		HexNumberFormat.uprChars[15] = 'F';
		HexNumberFormat.lowChars[15] = 'f';
	}

	static public final HexNumberFormat getInstance() {
		return new HexNumberFormat("XXXXXXXX");
	}

	public HexNumberFormat(String pattern) {
		super();
		this.count 	= pattern.length();
		hexChars 		= (pattern.charAt(0) == 'X' ? HexNumberFormat.uprChars : HexNumberFormat.lowChars);
	}

	public String format(int hexNum) throws IllegalArgumentException {
		FieldPosition pos = new FieldPosition(0);
		StringBuffer hexBuf = new StringBuffer(8);

		this.format(new Integer(hexNum), hexBuf, pos);

		return hexBuf.toString();
	}

	public StringBuffer format(Object hexInt, StringBuffer appendTo, FieldPosition fieldPos) throws IllegalArgumentException {
		char[] hexBuf = new char[16];

		int hexNum = ((Integer) hexInt).intValue();

		for (int i = 7; i >= 0; --i) {
			hexBuf[i] = hexChars[(hexNum & 0x0F)];
			hexNum = hexNum >> 4;
		}

		for (int i = (8 - this.count); i < 8; ++i) {
			appendTo.append(hexBuf[i]);
		}

		return appendTo;
	}

	public int parse(String source) throws ParseException {
		throw new ParseException("unimplemented!", 0);
	}

	public Object parseObject(String source, ParsePosition pos) {
		return null;
	}
}