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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
namespace BusinessRules.Evolution_Three
{
    /// <summary>Null Object Pattern</summary>
    /// <remarks>
    /// <list type="bullet">
    /// <item><description>Provides an interface identical to Income Tax Engine Object's so that a null 
    /// object can be substituted for a real object</description></item>
    /// <item><description>Implements its interface to do nothing. What exactly it means to do 
    /// nothing depends on what sort of behaviour the client is expecting</description></item>
    /// <item><description>When there is more than one way to do nothing, more than one Null Object 
    /// class may be required</description></item>
    /// </list>
    /// </remarks>
    internal class NullIncomeTaxEngine : IncomeTaxEngine
    {
        private const double ZERO_DOUBLE_VALUE = 0.0;

        #region Methods

        /// <summary>
        /// Calculates the tax rate.
        /// </summary>
        /// <param name="income">The investor.</param>
        /// <returns>
        /// Returns a double representing the tax liability for the investor.
        /// </returns>
        public override double CalculateTaxRate(double income)
        {
            return ZERO_DOUBLE_VALUE;
        }

        /// <summary>
        /// Calculates the tax liability.
        /// </summary>
        /// <param name="income">The investor.</param>
        /// <returns>
        /// Returns a double representing the tax rate for the investor.
        /// </returns>
        public override double CalculateTaxLiability(double income)
        {
            return ZERO_DOUBLE_VALUE;
        }

        #endregion
    }
}

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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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