1 files changed, 74 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/SingleEnumAccessor.cs b/csharp/src/ProtocolBuffers/FieldAccess/SingleEnumAccessor.cs
new file mode 100644
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+++ b/csharp/src/ProtocolBuffers/FieldAccess/SingleEnumAccessor.cs
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+using Google.ProtocolBuffers.Descriptors;
+
+namespace Google.ProtocolBuffers.FieldAccess
+{
+    /// <summary>
+    /// Accessor for fields representing a non-repeated enum value.
+    /// </summary>
+    internal sealed class SingleEnumAccessor<TMessage, TBuilder> : SinglePrimitiveAccessor<TMessage, TBuilder>
+        where TMessage : IMessage<TMessage, TBuilder>
+        where TBuilder : IBuilder<TMessage, TBuilder>
+    {
+        private readonly EnumDescriptor enumDescriptor;
+
+        internal SingleEnumAccessor(FieldDescriptor field, string name, bool supportFieldPresence) : base(field, name, supportFieldPresence)
+        {
+            enumDescriptor = field.EnumType;
+        }
+
+        /// <summary>
+        /// Returns an EnumValueDescriptor representing the value in the builder.
+        /// Note that if an enum has multiple values for the same number, the descriptor
+        /// for the first value with that number will be returned.
+        /// </summary>
+        public override object GetValue(TMessage message)
+        {
+            // Note: This relies on the fact that the CLR allows unboxing from an enum to
+            // its underlying value
+            int rawValue = (int) base.GetValue(message);
+            return enumDescriptor.FindValueByNumber(rawValue);
+        }
+
+        /// <summary>
+        /// Sets the value as an enum (via an int) in the builder,
+        /// from an EnumValueDescriptor parameter.
+        /// </summary>
+        public override void SetValue(TBuilder builder, object value)
+        {
+            ThrowHelper.ThrowIfNull(value, "value");
+            EnumValueDescriptor valueDescriptor = (EnumValueDescriptor) value;
+            base.SetValue(builder, valueDescriptor.Number);
+        }
+    }
+}
+\ No newline at end of file