From 9f37de960fec523c42b47d982f3fdab5b2d4d4d9 Mon Sep 17 00:00:00 2001
From: Jon Skeet <jonskeet@google.com>
Date: Tue, 14 Jul 2015 10:24:52 +0100
Subject: Changing reflection namespace (part 1)

- Move types into Google.Protobuf.Reflection
- Change codegen to reflect that in generated types

Generated code changes coming in part 2
---
 .../ProtocolBuffers/Reflection/OneofAccessor.cs    | 85 ++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 csharp/src/ProtocolBuffers/Reflection/OneofAccessor.cs

(limited to 'csharp/src/ProtocolBuffers/Reflection/OneofAccessor.cs')

diff --git a/csharp/src/ProtocolBuffers/Reflection/OneofAccessor.cs b/csharp/src/ProtocolBuffers/Reflection/OneofAccessor.cs
new file mode 100644
index 00000000..7a11d36b
--- /dev/null
+++ b/csharp/src/ProtocolBuffers/Reflection/OneofAccessor.cs
@@ -0,0 +1,85 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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.
+#endregion
+
+using System;
+using System.Reflection;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Reflection access for a oneof, allowing clear and "get case" actions.
+    /// </summary>
+    public sealed class OneofAccessor
+    {
+        private readonly Func<object, int> caseDelegate;
+        private readonly Action<object> clearDelegate;
+        private OneofDescriptor descriptor;
+
+        internal OneofAccessor(Type type, string propertyName, OneofDescriptor descriptor) 
+        {
+            PropertyInfo property = type.GetProperty(propertyName + "Case");
+            if (property == null || !property.CanRead)
+            {
+                throw new ArgumentException("Not all required properties/methods available");
+            }
+            this.descriptor = descriptor;
+            caseDelegate = ReflectionUtil.CreateFuncObjectT<int>(property.GetGetMethod());
+
+            this.descriptor = descriptor;
+            MethodInfo clearMethod = type.GetMethod("Clear" + propertyName);
+            clearDelegate = ReflectionUtil.CreateActionObject(clearMethod);
+        }
+
+        public OneofDescriptor Descriptor { get { return descriptor; } }
+
+        /// <summary>
+        /// Clears the oneof in the specified message.
+        /// </summary>
+        public void Clear(object message)
+        {
+            clearDelegate(message);
+        }
+
+        /// <summary>
+        /// Indicates which field in the oneof is set for specified message
+        /// </summary>
+        public FieldDescriptor GetCaseFieldDescriptor(object message)
+        {
+            int fieldNumber = caseDelegate(message);
+            if (fieldNumber > 0)
+            {
+                return descriptor.ContainingType.FindFieldByNumber(fieldNumber);
+            }
+            return null;
+        }
+    }
+}
-- 
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