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-rw-r--r--csharp/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs91
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diff --git a/csharp/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs b/csharp/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs
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--- a/csharp/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.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 System;
-using System.Reflection;
-using Google.ProtocolBuffers.Descriptors;
-
-namespace Google.ProtocolBuffers.FieldAccess
-{
- /// <summary>
- /// Accessor for fields representing a non-repeated message value.
- /// </summary>
- internal sealed class SingleMessageAccessor<TMessage, TBuilder> : SinglePrimitiveAccessor<TMessage, TBuilder>
- where TMessage : IMessage<TMessage, TBuilder>
- where TBuilder : IBuilder<TMessage, TBuilder>
- {
- /// <summary>
- /// The static method to create a builder for the property type. For example,
- /// in a message type "Foo", a field called "bar" might be of type "Baz". This
- /// method is Baz.CreateBuilder.
- /// </summary>
- private readonly Func<IBuilder> createBuilderDelegate;
-
- internal SingleMessageAccessor(FieldDescriptor field, string name, string containingOneofName, bool supportFieldPresence)
- : base(field, name, containingOneofName, supportFieldPresence)
- {
- MethodInfo createBuilderMethod = ClrType.GetMethod("CreateBuilder", ReflectionUtil.EmptyTypes);
- if (createBuilderMethod == null)
- {
- throw new ArgumentException("No public static CreateBuilder method declared in " + ClrType.Name);
- }
- createBuilderDelegate = ReflectionUtil.CreateStaticUpcastDelegate(createBuilderMethod);
- }
-
- /// <summary>
- /// Creates a message of the appropriate CLR type from the given value,
- /// which may already be of the right type or may be a dynamic message.
- /// </summary>
- private object CoerceType(object value)
- {
- ThrowHelper.ThrowIfNull(value, "value");
- // If it's already of the right type, we're done
- if (ClrType.IsInstanceOfType(value))
- {
- return value;
- }
-
- // No... so let's create a builder of the right type, and merge the value in.
- IMessageLite message = (IMessageLite) value;
- return CreateBuilder().WeakMergeFrom(message).WeakBuild();
- }
-
- public override void SetValue(TBuilder builder, object value)
- {
- base.SetValue(builder, CoerceType(value));
- }
-
- public override IBuilder CreateBuilder()
- {
- return createBuilderDelegate();
- }
- }
-} \ No newline at end of file