com.hfg.units.BaseSIUnitConverter Maven / Gradle / Ivy

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package com.hfg.units;


import java.math.BigDecimal;
import java.math.MathContext;
import java.math.RoundingMode;

public class BaseSIUnitConverter
{
   private double mScalingFactor;
   private Double mOffset;
   private MathContext mMathContext = sDefaultMathContext;

   private static MathContext sDefaultMathContext = new MathContext(16, RoundingMode.HALF_UP);

   //###########################################################################
   // CONSTRUCTORS
   //###########################################################################

   //---------------------------------------------------------------------------
   public BaseSIUnitConverter(double inScalingFactor)
   {
      mScalingFactor = inScalingFactor;
   }

   //###########################################################################
   // PUBLIC METHODS
   //###########################################################################

   //---------------------------------------------------------------------------
   public static void setDefaultMathContext(MathContext inValue)
   {
      sDefaultMathContext = inValue;
   }

   //---------------------------------------------------------------------------
   public BaseSIUnitConverter setMathContext(MathContext inValue)
   {
      mMathContext = inValue;
      return this;
   }

   //---------------------------------------------------------------------------
   public BaseSIUnitConverter setOffset(Double inValue)
   {
      mOffset = inValue;
      return this;
   }

   //---------------------------------------------------------------------------
   public Double apply(Double inValue)
   {
      BigDecimal bigDecimalValue = allocateBigDecimal(inValue).multiply(allocateBigDecimal(mScalingFactor));

      if (mOffset != null)
      {
         bigDecimalValue = bigDecimalValue.add(allocateBigDecimal(mOffset));
      }

      return bigDecimalValue.doubleValue();
   }

   //---------------------------------------------------------------------------
   public Double reverse(Double inValue)
   {
      BigDecimal bigDecimalValue = allocateBigDecimal(inValue).divide(allocateBigDecimal(mScalingFactor), mMathContext);

      if (mOffset != null)
      {
         bigDecimalValue = bigDecimalValue.subtract(allocateBigDecimal(mOffset));
      }

      return bigDecimalValue.doubleValue();
   }

   //###########################################################################
   // PRIVATE METHODS
   //###########################################################################

   //---------------------------------------------------------------------------
   private BigDecimal allocateBigDecimal(double inValue)
   {
      return new BigDecimal(Double.toString(inValue), mMathContext);
   }
}