1 files changed, 31 insertions, 0 deletions
diff --git a/src/ProtocolBuffers/EnumLite.cs b/src/ProtocolBuffers/EnumLite.cs
new file mode 100644
index 00000000..0c6c9afb
--- /dev/null
+++ b/src/ProtocolBuffers/EnumLite.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Google.ProtocolBuffers {
+
+  ///<summary>
+  ///Interface for an enum value or value descriptor, to be used in FieldSet.
+  ///The lite library stores enum values directly in FieldSets but the full
+  ///library stores EnumValueDescriptors in order to better support reflection.
+  ///</summary>
+  public interface IEnumLite {
+    int Number { get; }
+  }
+
+  ///<summary>
+  ///Interface for an object which maps integers to {@link EnumLite}s.
+  ///{@link Descriptors.EnumDescriptor} implements this interface by mapping
+  ///numbers to {@link Descriptors.EnumValueDescriptor}s.  Additionally,
+  ///every generated enum type has a static method internalGetValueMap() which
+  ///returns an implementation of this type that maps numbers to enum values.
+  ///</summary>
+  public interface IEnumLiteMap<T> : IEnumLiteMap
+    where T : IEnumLite {
+    T FindValueByNumber(int number);
+  }
+
+  public interface IEnumLiteMap {
+    bool IsValidValue(IEnumLite value);
+  }
+}