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Creating The Domain Model

Current Limitations

• You're expected to either have properties for your foreign keys or use back references

The Demo Domain

• A person has one or more vehicles
• A vehicle has one or more drivers
• A person lives at an address
• A person has different phone numbers (home, cell, work)
• A person makes an appointment for a vehicle OR
• An appointment is for a single person and one of their vehicles
• A completed appointment has a bill
• A bill has one or more line items
• A line item is either for a product consumed or a service performed

DemoBase

public class DemoBase : StateTracking
{
    public long Id { get; private set; }
}

Person

[StateTrackingAspect]
public class Customer : DemoBase
{
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public PhoneNumber PrimaryPhone { get; set; }
    public PhoneNumber SecondaryPhone { get; set; }
    public EmailAddress PrimaryEmail { get; set; }
    public EmailAddress SecondaryEmail { get; set; }

    public Address MainAddress { get; set; }
    public IList<IVehicle> Vehicles { get; set; }

    public Customer()
    {
        Vehicles = DomainFactory.Get<IList<IVehicle>>();
    }
}

Contact Information

public struct PhoneNumber
{
    private bool _valid;
    private string _country;
    private string _area;
    private string _exchange;
    private string _number;
    private string _extension;

    public string Country 
    { 
        get { return _country; }
        private set { _country = value; } 
    }
    public string Area
    {
        get { return _area; }
        private set { _area = value; }
    }
    public string Exchange
    {
        get { return _exchange; }
        private set { _exchange = value; }
    }
    public string Number
    {
        get { return _number; }
        private set { _number = value; }
    }
    public string Extension
    {
        get { return _extension; }
        private set { _extension = value; }
    }

    public PhoneNumber(string country, string area, string exchange, string number, string extension)
    {
        _country = country;
        _area = area;
        _exchange = exchange;
        _number = number;
        _extension = extension;
        _valid = true;
    }

    public override string ToString()
    {
        if (!_valid)
            return "";

        var format = "{0}-{1}-{2}";
        var sections = new List<string>
                           {
                               Area,
                               Exchange,
                               Number
                           };

        if(!string.IsNullOrEmpty(Country))
        {
            sections.Add(Country);
            format = string.Concat("{3}-", format);
        }

        if(!string.IsNullOrEmpty(Extension))
        {
            sections.Add(Extension);
            format = string.Concat(format, sections.Count == 3 ? " ext. {3}" : " ext. {4}");
        }

        return string.Format(format, sections);
    }

    public override bool Equals(object obj)
    {
        if(!_valid)
            return false;

        var candidate = (PhoneNumber) obj;
        return
            candidate.Country.Equals(Country) &&
            candidate.Country.Equals(Area) &&
            candidate.Country.Equals(Exchange) &&
            candidate.Country.Equals(Number) &&
            candidate.Country.Equals(Extension);
    }
}

public struct EmailAddress
{
    private bool _valid;
    private string _account;
    private string _domainName;

    public string Account
    { 
        get { return _account; }
        private set { _account = value; }
    }

    public string Domain
    { 
        get { return _domainName; }
        private set { _domainName = value; }
    }

    public EmailAddress(string emailAddress)
    {
        var parts = emailAddress.Split('@');
        _account = parts[0];
        _domainName = parts[1];
        _valid = true;
    }

    public override string ToString()
    {
        return string.Format("{0}@{1}", _account, _domainName);
    }

    public override bool Equals(object obj)
    {
        if(!_valid)
            return false;

        var candidate = (EmailAddress) obj;
        return
            candidate.Account.Equals(Account) &&
            candidate.Domain.Equals(Domain);
    }

}

IVehicle

public interface IVehicle
{
    IList<Customer> Drivers { get; set; }

    string Make { get; set; }
    string Model { get; set; }
    int Year { get; set; }
    string Color { get; set; }
}

public enum VehicleType
{
    Car = 1,
    Truck = 2
}

public abstract class Vehicle : DemoBase, IVehicle
{
    public virtual IList<Customer> Drivers { get; set; }

    public virtual string Make { get; set; }
    public virtual string Model { get; set; }
    public virtual int Year { get; set; }
    public virtual string Color { get; set; }
    public virtual VehicleType VehicleType { get; set; }

    public Vehicle()
    {
        Drivers = DomainFactory.Get <IList<Customer>>();
    }
}

[StateTrackingAspect]
public class Car : Vehicle
{
    
}

[StateTrackingAspect]
public class Truck : Vehicle
{

}

Address

[StateTrackingAspect]
public class Address : DemoBase
{
    public List<Customer> Residents { get; set; }

    public string Street1 { get; set; }
    public string Street2 { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Zip { get; set; }
}

Appointment

[StateTrackingAspect]
public class Appointment : DemoBase
{
    public Customer Customer { get; set; }
    public IVehicle Vehicle { get; set; }
    public Bill Bill { get; set; }

    public DateTime Time { get; set; }
}

Bill

[StateTrackingAspect]
public class Bill : DemoBase
{
    public IList<LineItem> LineItems { get; set; }
    public Appointment Appointment { get; set; }

    public Bill()
    {
        LineItems = DomainFactory.Get<IList<LineItem>>();
    }
}

LineItem

public abstract class LineItem : DemoBase
{
    public Bill Bill { get; set; }
    public decimal Units { get; set; }
}

public class ServiceLineItem : LineItem
{
    public Service ServicePerformed { get; set; }
}

public class ProductLineItem : LineItem
{
    public Product ProductUsed { get; set; }
}

public abstract class HasCostBase : DemoBase
{
    public string Name { get; set; }
    public decimal Cost { get; set; }
}

[StateTrackingAspect]
public class Service : HasCostBase
{
}

[StateTrackingAspect]
public class Product : HasCostBase
{
}