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Who cares about Domain Rules?

, 20 Nov 2006
With this article, I am evolving a domain problem towards the best possible solution.
domainrules_src.zip
BusinessRules
0 - Procedural_Way
0 - Procedural_Way.smp
ProceduralWay.cd
Tests
1 - Evolution One
1 - Evolution One.smp
EvolutionOne.cd
Tests
2 - Evolution Two
2 - Evolution Two.smp
EvolutionTwo.cd
Tests
3 - Evolution Three
3 - Evolution Three.smp
EvolutionThree.cd
IncomeTaxEngine.cd
Tests
4 - Evolution Four
4 - Evolution Four.smp
EvolutionFour.cd
Tests
5 - Evolution Five
5 - Evolution Five.smp
EvolutionFive.cd
TaxBandGenerator.cd
Tests
bin
Debug
BusinessRules.dll
BusinessRules.dll.lastcodeanalysissucceeded
NMock2.dll
BusinessRules.csproj.user
obj
Debug
BusinessRules.dll
TempPE
Properties
Tools
NMock2.dll
nunit.framework.dll
using System.Globalization;

namespace BusinessRules.Procedural_Way
{
    /// <summary>
    /// Investor Domain object
    /// </summary>
    public class Investor
    {
        #region Fields

        private double income;
        private string m_currentCultureName = CultureInfo.CurrentCulture.Name;

        #endregion

        #region C'tors

        /// <summary>
        /// Initializes a new instance of the <see cref="Investor"/> class.
        /// </summary>
        /// <param name="income">The investors income.</param>
        public Investor(double income)
        {
            this.income = income;
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets the income.
        /// </summary>
        /// <value>The income.</value>
        public double Income
        {
            get { return income; }
            set { income = value; }
        }

        /// <summary>
        /// Gets the tax liability.
        /// </summary>
        /// <value>The tax liability.</value>
        public double TaxLiability
        {
            get
            {
                double taxLiability = 0.0;
                double inv_income = Income;

                switch (CurrentCultureName)
                {
                    case "en-NZ":
                        // Calculate the Tax Liability for the Investor according 
                        // to the tax laws of the New Zealand
                        if (inv_income > 19500.99)
                        {
                            taxLiability += 19500.99 * 0.195;
                        }
                        if (inv_income <= 19500.99)
                        {
                            taxLiability += inv_income * 0.195;
                        }
                        if (inv_income > 60000.99)
                        {
                            taxLiability += (60000.99 - 19501.00) * 0.33;
                        }
                        if (inv_income >= 19501.00 && inv_income <= 60000.99)
                        {
                            taxLiability += (inv_income - 19501.00) * 0.33;
                        }
                        if (inv_income > 60000.99)
                        {
                            taxLiability += (inv_income - 60000.99) * 0.39;
                        }
                        break;
                    case "en-AU":
                        // Calculate the Tax Liability for the Investor according 
                        // to the tax laws of the Australia
                        if (inv_income >= 6001.00 && inv_income <= 25000.99)
                        {
                            taxLiability += (inv_income - 6000.99) * 0.15;
                        }
                        if (inv_income > 25000.99)
                        {
                            taxLiability += (25000.99 - 6001.00) * 0.15;
                        }
                        if (inv_income > 75000.99)
                        {
                            taxLiability += (75000.99 - 25001.00) * 0.30;
                        }
                        if (inv_income >= 25001.00 && inv_income <= 75000.99)
                        {
                            taxLiability += (inv_income - 25001.00) * 0.30;
                        }
                        if (inv_income > 150000.99)
                        {
                            taxLiability += (150000.99 - 75001.00) * 0.40;
                        }
                        if (inv_income >= 75001.00 && inv_income <= 150000.99)
                        {
                            taxLiability += (inv_income - 75001.00) * 0.40;
                        }
                        if (inv_income > 150000.99)
                        {
                            taxLiability += (inv_income - 150000.99) * 0.45;
                        }
                        break;
                    case "en-US":
                        // Calculate the Tax Liability for the Investor according 
                        // to the tax laws of the USA
                        if (inv_income > 7550.99)
                        {
                            taxLiability += 7550.99 * 0.10;
                        }
                        if (inv_income >= 0.0 && inv_income <= 7550.99)
                        {
                            taxLiability += inv_income * 0.10;
                        }
                        if (inv_income > 30650.99)
                        {
                            taxLiability += (30650.99 - 7551.00) * 0.15;
                        }
                        if (inv_income >= 7551.00 && inv_income <= 30650.99)
                        {
                            taxLiability += (inv_income - 7551.00) * 0.15;
                        }
                        if (inv_income > 74200.99)
                        {
                            taxLiability += (74200.99 - 30651.00) * 0.25;
                        }
                        if (inv_income >= 30651.00 && inv_income <= 74200.99)
                        {
                            taxLiability += (inv_income - 30651.00) * 0.25;
                        }
                        if (inv_income > 154800.99)
                        {
                            taxLiability += (154800.99 - 74201.00) * 0.28;
                        }
                        if (inv_income >= 74201.00 && inv_income <= 154800.99)
                        {
                            taxLiability += (inv_income - 74201.00) * 0.28;
                        }
                        if (inv_income > 336550.99)
                        {
                            taxLiability += (336550.99 - 154801.00) * 0.33;
                        }
                        if (inv_income >= 154801.00 && inv_income <= 336550.99)
                        {
                            taxLiability += (inv_income - 154801.00) * 0.33;
                        }
                        if (inv_income > 336551.00)
                        {
                            taxLiability += (inv_income - 336551.00) * 0.35;
                        }
                        break;
                    default:
                        taxLiability = 0.0;
                        break;
                }
                return taxLiability;
            }
        }

        /// <summary>
        /// Gets the tax rate.
        /// </summary>
        /// <value>The tax rate.</value>
        public double TaxRate
        {
            get
            {
                double taxRate;
                double inv_income = Income;

                switch (CurrentCultureName)
                {
                    case "en-NZ": // Calculate the tax rate for New Zealand
                        if (inv_income >= 0.0 && inv_income <= 19500.99)
                            taxRate = 0.195;
                        else if (inv_income >= 19501.00 && inv_income <= 60000.99)
                            taxRate = 0.33;
                        else
                            taxRate = 0.39;
                        break;
                    case "en-AU": // Calculate the tax rate for Australia
                        if (inv_income >= 0.0 && inv_income <= 6000.99)
                            taxRate = 0.0;
                        else if (inv_income >= 6001.00 && inv_income <= 25000.99)
                            taxRate = 0.15;
                        else if (inv_income >= 25001.00 && inv_income <= 75000.99)
                            taxRate = 0.30;
                        else if (inv_income >= 75001.00 && inv_income <= 150000.99)
                            taxRate = 0.40;
                        else
                            taxRate = 0.45;
                        break;
                    case "en-US": // Calculate the tax rate for the United States of America
                        if (inv_income >= 0.0 && inv_income <= 7550.99)
                            taxRate = 0.10;
                        else if (inv_income >= 7551.00 && inv_income <= 30650.99)
                            taxRate = 0.15;
                        else if (inv_income >= 30651.00 && inv_income <= 74200.99)
                            taxRate = 0.25;
                        else if (inv_income >= 74201.00 && inv_income <= 154800.99)
                            taxRate = 0.28;
                        else if (inv_income >= 154801.00 && inv_income <= 336550.99)
                            taxRate = 0.33;
                        else
                            taxRate = 0.35;
                        break;
                    default:
                        taxRate = 0.0;
                        break;
                }
                return taxRate;
            }
        }

        /// <summary>
        /// Gets or sets the name of the current culture.
        /// </summary>
        /// <value>The name of the current culture.</value>
        public string CurrentCultureName
        {
            get { return m_currentCultureName; }
            set { m_currentCultureName = value; }
        }

        #endregion
    }
}

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License

This article, along with any associated source code and files, is licensed under The MIT License

About the Author

Maruis Marais
Web Developer
New Zealand New Zealand
No Biography provided

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