/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   Copyright (C) 2005 - Matteo Merli - matteo.merli@gmail.com            *
 *                                                                         *
 ***************************************************************************/

/*
 * $Id: UnsignedNumber.java 316 2005-12-04 14:48:53Z merlimat $
 * 
 * $URL: http://svn.berlios.de/svnroot/repos/rtspproxy/tags/3.0-ALPHA2/src/main/java/rtspproxy/lib/number/UnsignedNumber.java $
 * 
 */
package video.lib;

/**
 * @author Matteo Merli
 */
public abstract class UnsignedNumber extends Number {
  /**
   * 
   */
  private static final long serialVersionUID = 1L;

  /**
   * Get a byte array representation of the number. The order will be MSB first
   * (Big Endian).
   * 
   * @return the serialized number
   */
  public abstract byte[] getBytes();

  /**
   * Perform a bit right shift of the value.
   * 
   * @param nBits
   *          the number of positions to shift
   */
  public abstract void shiftRight(int nBits);

  /**
   * Perform a bit left shift of the value.
   * 
   * @param nBits
   *          the number of positions to shift
   */
  public abstract void shiftLeft(int nBits);

  public abstract String toString();

  public abstract int compareTo(UnsignedNumber other);

  public abstract boolean equals(Object other);

  public abstract int hashCode();

  public String toHexString() {
    return toHexString(false);
  }

  public String toHexString(boolean pad) {
    StringBuilder sb = new StringBuilder();
    boolean started = false;
    for (byte b : getBytes())
      if (!started && b == 0) {
        if (pad)
          sb.append("00");
      } else {
        sb.append(hexLetters[(byte) ((b >> 4) & 0x0F)]).append(hexLetters[b & 0x0F]);
        started = true;
      }
    if (sb.length() == 0)
      return "0";
    return sb.toString();
  }

  protected static final char[] hexLetters = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
}