mathutils.java

j2ee源码

/*
 * Created on 2005/11/1
 */
package com.leeman.common.util;

/**
 * @author Dennis
 */
public class MathUtils {
	
	public static Double wtKg_to_Tons(Double WtKg)
	{
		if (WtKg != null)
			return new Double(wtKg_to_Tons(WtKg.doubleValue()));
		else
			return null; 
	}

	public static double wtKg_to_Tons(double WtKg)
	{
		return WtKg / 1000;
	}

	public static Double wtTons_to_Kg(Double WtTons)
	{
		if (WtTons != null)
			return new Double(wtTons_to_Kg(WtTons.doubleValue()));
		else
			return null;
	}

	public static double wtTons_to_Kg(double WtTons)
	{
		return WtTons * 1000;
	}

	public static double uomIN_to_MM(double uomIN)
	{
		return uomIN * 25.4;
	}

	public static double uomMM_to_M(double uomMM)
	{
		return uomMM / 1000;
	}

	public static Double round(Double data, int dp) throws Exception
	{
		return new Double(round(data.doubleValue(), dp));
	}

	public static double round(double data, int dp) throws Exception
	{ 
		if (dp < 0 || dp > 8){
			throw new Exception ("Unsupported rounding decimal place.");
		}
		else{
			double DP[] = new double[9];
			DP[0] = 1;
			DP[1] = 10;
			DP[2] = 100;
			DP[3] = 1000;
			DP[4] = 10000;
			DP[5] = 100000;
			DP[6] = 1000000;
			DP[7] = 10000000;
			DP[8] = 100000000;
						
			return Math.round((data * DP[dp])+0.00001) / DP[dp];
		}
	}

	public static Double toBaseCurrency(Double value, Double exchangeRate) throws Exception
	{
		return new Double(MathUtils.round(value.doubleValue() * exchangeRate.doubleValue(), 2));
	}
	
	public static double calc_est_WeightTons(Double paperSize, String UOM, Long paperTypeLength, Double baseWeight, Long Qty) throws Exception
	{
		if (paperSize == null || UOM == null || paperTypeLength == null || baseWeight == null){
			throw new Exception ("est_WeightTons(): invalid paper size/uom/paper type length/ base weight");	
		}
		else if (!UOM.equals("I") && !UOM.equals("M")){
			throw new Exception ("est_WeightTons(): uom should be in MM or IN");			
		}
		else{
			double paperSizeInMetre = 0;
			if ( UOM.equalsIgnoreCase("M"))
			{
				paperSizeInMetre = uomMM_to_M(paperSize.doubleValue());
			}
			else if(UOM.equalsIgnoreCase("I"))
			{
				paperSizeInMetre = uomMM_to_M(uomIN_to_MM(paperSize.doubleValue()));
			}
		
			double estWtTonsUnit = wtKg_to_Tons(paperSizeInMetre * paperTypeLength.doubleValue() * baseWeight.doubleValue());
		
			double estWtTons = round(estWtTonsUnit, 3) * Qty.doubleValue();
		
			return round((estWtTons),3);
		}
	}

	public static long calc_est_Rolls(Double paperSize, String UOM, Long paperTypeLength, Double baseWeight, Double Est_weight) throws Exception
	{
		if (paperSize == null || UOM == null || paperTypeLength == null || baseWeight == null){
			throw new Exception ("est_Rolls(): invalid paper size/uom/paper type length/ base weight");	
		}
		else if (!UOM.equals("I") && !UOM.equals("M")){
			throw new Exception ("est_Rolls(): uom should be in MM or IN");			
		}
		else{
			double paperSizeInMetre = 0;
			if ( UOM.equalsIgnoreCase("M"))
			{
				paperSizeInMetre = uomMM_to_M(paperSize.doubleValue());
			}
			else if(UOM.equalsIgnoreCase("I"))
			{
				paperSizeInMetre = uomMM_to_M(uomIN_to_MM(paperSize.doubleValue()));
			}

			double estWtTonsUnit = wtKg_to_Tons(paperSizeInMetre * paperTypeLength.doubleValue() * baseWeight.doubleValue());

			Long estRolls = new Long ( new Double(round(Est_weight.doubleValue() / round(estWtTonsUnit, 3),0)).longValue() ) ;

			return estRolls.longValue() ;
		}
	}
}