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Who cares about Domain Rules?

, 20 Nov 2006 MIT
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
namespace BusinessRules.Evolution_Two
{
    /// <summary>
    /// Investor Domain object specific to the States
    /// </summary>
    internal class USAInvestor : Investor
    {
        #region Fields

        private double taxRate;

        #endregion

        #region C'tors

        /// <summary>
        /// Initializes a new instance of the <see cref="USAInvestor"/> class.
        /// </summary>
        /// <param name="income">The income.</param>
        internal USAInvestor(double income) : base(income)
        {
        }

        #endregion

        #region Properties

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

                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;

                return taxRate;
            }
        }

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

        #endregion
    }
}

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

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About the Author

Maruis Marais
Web Developer
New Zealand New Zealand
No Biography provided

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