1 files changed, 42 insertions, 0 deletions
diff --git a/slips/src/app/Marina/DataAccess/IdentityMap.cs b/slips/src/app/Marina/DataAccess/IdentityMap.cs
new file mode 100644
index 0000000..c251379
--- /dev/null
+++ b/slips/src/app/Marina/DataAccess/IdentityMap.cs
@@ -0,0 +1,42 @@
+using System.Collections.Generic;
+using Marina.DataAccess.Exceptions;
+using Marina.Domain.Interfaces;
+
+namespace Marina.DataAccess {
+	public class IdentityMap< T > : IIdentityMap< T > where T : IDomainObject {
+		public IdentityMap() {
+			_items = new List< T >( );
+		}
+
+		public void Add( T domainObject ) {
+			EnsureObjectHasNotAlreadyBeenAdded( domainObject );
+			_items.Add( domainObject );
+		}
+
+		public bool ContainsObjectWithIdOf( long idOfObjectToFind ) {
+			foreach ( T item in _items ) {
+				if ( item.ID( ).Equals( idOfObjectToFind ) ) {
+					return true;
+				}
+			}
+			return false;
+		}
+
+		public T FindObjectWithIdOf( long idOfObjectToFind ) {
+			foreach ( T item in _items ) {
+				if ( item.ID( ).Equals( idOfObjectToFind ) ) {
+					return item;
+				}
+			}
+			return default( T );
+		}
+
+		private void EnsureObjectHasNotAlreadyBeenAdded( T domainObject ) {
+			if ( ContainsObjectWithIdOf( domainObject.ID( ) ) ) {
+				throw new ObjectAlreadyAddedToIdentityMapException( domainObject );
+			}
+		}
+
+		private readonly IList< T > _items;
+	}
+}
+\ No newline at end of file