1 files changed, 38 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorBase.cs b/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorBase.cs
new file mode 100644
index 00000000..51b94931
--- /dev/null
+++ b/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorBase.cs
@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using Google.Protobuf;
+using Google.Protobuf.FieldAccess;
+
+namespace Google.Protobuf.FieldAccess
+{
+    /// <summary>
+    /// Base class for field accessors.
+    /// </summary>
+    /// <typeparam name="T">Type of message containing the field</typeparam>
+    internal abstract class FieldAccessorBase<T> : IFieldAccessor<T> where T : IMessage<T>
+    {
+        private readonly Func<T, object> getValueDelegate;
+
+        internal FieldAccessorBase(string name)
+        {
+            PropertyInfo property = typeof(T).GetProperty(name);
+            if (property == null || !property.CanRead)
+            {
+                throw new ArgumentException("Not all required properties/methods available");
+            }
+            getValueDelegate = ReflectionUtil.CreateUpcastDelegate<T>(property.GetGetMethod());
+        }
+
+        public object GetValue(T message)
+        {
+            return getValueDelegate(message);
+        }
+
+        public abstract bool HasValue(T message);
+        public abstract void Clear(T message);
+        public abstract void SetValue(T message, object value);
+    }
+}