Missed a file in previous commit

--HG--
branch : dev

src/Orchard/ContentManagement/Utilities/LazyField.cs

@@ -0,0 +1,40 @@
+using System;
+
+namespace Orchard.ContentManagement.Utilities {
+    public class LazyField<T> {
+        private T _value;
+        private Func<T, T> _loader;
+        private Func<T, T> _setter;
+
+        public T Value {
+            get { return GetValue(); }
+            set { SetValue(value); }
+        }
+
+        public void Loader(Func<T, T> loader) {
+            _loader = loader;
+        }
+
+        public void Setter(Func<T, T> setter) {
+            _setter = setter;
+        }
+
+        private T GetValue() {
+            if (_loader != null) {
+                _value = _loader(_value);
+                _loader = null;
+            }
+            return _value;
+        }
+
+        private void SetValue(T value) {
+            _loader = null;
+            if (_setter != null) {
+                _value = _setter(value);
+            }
+            else {
+                _value = value;
+            }
+        }
+    }
+}