Make Exponention : Math « Development Class « Java






  1. Java
  2. Development Class
  3. Math

Make Exponention

        
/*
 * Copyright (c) 2003 - 2007 OpenSubsystems s.r.o. Slovak Republic. All rights reserved.
 * 
 * Project: OpenSubsystems
 * 
 * $Id: NumberUtils.java,v 1.9 2007/01/07 06:14:01 bastafidli Exp $
 * 
 * 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; version 2 of the License. 
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 */

import java.text.NumberFormat;

/**
 * Collection of useful utilities to work with numbers. 
 * 
 * @version $Id: NumberUtils.java,v 1.9 2007/01/07 06:14:01 bastafidli Exp $
 * @author Peter Satury
 * @code.reviewer Miro Halas
 * @code.reviewed Initial revision
 */
public final class NumberUtils
{
   // Constants ////////////////////////////////////////////////////////////////
   
   /**
    * Static array used to append leading 0 chars to file name constructed from
    * number.
    */
   protected static final char[] ZEROCHARS = {'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
                                              '0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
                                              '0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
                                              '0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
                                              '0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
                                             };

   // Cached values ////////////////////////////////////////////////////////////
   
   /**
    * static Number format for no Exponent 
    */
   public static final NumberFormat NFFORMAT;
   
   /**
    * static Number format for no Exponent for editing
    */
   public static final NumberFormat NFFORMATEDIT;

   /**
    * static Number format for Currency
    */
   public static final NumberFormat NFCURRENCYFORMAT;

   /**
    * static Number format for Currency for editing
    */
   public static final NumberFormat NFCURRENCYFORMATEDIT;

   // Constructors /////////////////////////////////////////////////////////////
   
   /**
    * Static initializer.
    */
   static
   {
      
      NFFORMAT = NumberFormat.getNumberInstance();
      NFFORMAT.setMaximumFractionDigits(20);
      
      NFFORMATEDIT = NumberFormat.getNumberInstance();
      NFFORMATEDIT.setMaximumFractionDigits(20);
      NFFORMATEDIT.setGroupingUsed(false);

      NFCURRENCYFORMAT = NumberFormat.getNumberInstance();
      NFCURRENCYFORMAT.setMaximumFractionDigits(2);
      NFCURRENCYFORMAT.setMinimumFractionDigits(2);

      NFCURRENCYFORMATEDIT = NumberFormat.getNumberInstance();
      NFCURRENCYFORMATEDIT.setMaximumFractionDigits(2);
      NFCURRENCYFORMATEDIT.setMinimumFractionDigits(2);
      NFCURRENCYFORMATEDIT.setGroupingUsed(false);

   }

   /** 
    * Private constructor since this class cannot be instantiated
    */
   private NumberUtils(
   )
   {
      // Do nothing
   }

   // Public methods ///////////////////////////////////////////////////////////
   
   /**
    * Method to make Exponention
    * 
    * @param iBbase - base of Exponention [1..]
    * @param iExponent - exponent of Exponention [0..14]
    * @return long - result of Exponention
    * @throws IllegalArgumentException - in case of arguments out of valid range
    */
   public static long exponentiate(
      int iBbase, 
      int iExponent
   ) throws IllegalArgumentException
   {
      if (iExponent > 14 || iExponent < 0)
      {
         throw new IllegalArgumentException(
               "Exponent could not be greater then 14 and lower then 0");
      }
      if (iBbase < 1)
      {
         throw new IllegalArgumentException(
               "Exponentiate base could not be lower then 1");
      }
      long lReturn = 1;
      for (int iCounter = 0; iCounter < iExponent; iCounter++)
      {
         try
         {
            lReturn = lReturn * iBbase;
         } 
         catch (Exception eExc)
         {
            throw new IllegalArgumentException(
                  "Exponentiate arguments too high");
         }
      }
      return lReturn;
   }

   /**
    * Method to make specified length digit number string representation from particular 
    * input number.
    * For example, if there will be send input number 32 and digit lenhth = 8, output 
    * will be string '00000032'
    * 
    * @param iInputNumber - input number that will be converted into 8 digit number 
    *                       string representation
    * @param iDigitLength - length of the output digit number string
    * 
    * @return String - digit number string representation
    */
   public static String getDigitNumberString(
      int iInputNumber,
      int iDigitLength
   )
   {
      StringBuffer idString = new StringBuffer(Integer.toString(iInputNumber));
      
      if (iDigitLength - idString.length() > 0)
      {
         idString.insert(0, ZEROCHARS, 0, iDigitLength - idString.length());
      }

      return idString.toString();
   }
}








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