1 files changed, 56 insertions, 0 deletions
diff --git a/DesignPatterns/src/app/DesignPatterns.Factory/Money.cs b/DesignPatterns/src/app/DesignPatterns.Factory/Money.cs
new file mode 100644
index 0000000..956c9a6
--- /dev/null
+++ b/DesignPatterns/src/app/DesignPatterns.Factory/Money.cs
@@ -0,0 +1,56 @@
+using System;
+
+namespace DesignPatterns.Factory {
+	public class Money : IMoney {
+		public Money( double amount ) : this( amount, Currency.Canadian ) {}
+
+		public Money( double amount, ICurrency currency ) {
+			if ( amount < 0 ) {
+				throw new NegativeMoneyException( );
+			}
+			_amount = amount;
+			_currency = currency;
+		}
+
+		public double Amount {
+			get { return _amount; }
+		}
+
+		public ICurrency TypeOfCurrency {
+			get { return _currency; }
+		}
+
+		public IMoney Add( IMoney other ) {
+			if ( other != null ) {
+				if ( other.TypeOfCurrency.Equals( TypeOfCurrency ) ) {
+					return new Money( other.Amount + Amount );
+				}
+				throw new CannotAddMoniesException( "Cannot add monies of different currency" );
+			}
+			return this;
+		}
+
+		public IMoney Subtract( IMoney money ) {
+			return ( money != null ) ? new Money( Amount - money.Amount ) : null;
+		}
+
+		public override bool Equals( object obj ) {
+			IMoney other = obj as Money;
+			if ( other != null ) {
+				return other.Amount == Amount;
+			}
+			return false;
+		}
+
+		public override int GetHashCode( ) {
+			return base.GetHashCode( ) + new Random( ( int )DateTime.Now.Ticks ).Next( );
+		}
+
+		public override string ToString( ) {
+			return _amount.ToString( "F" );
+		}
+
+		private readonly double _amount;
+		private readonly ICurrency _currency;
+	}
+}
+\ No newline at end of file