Squashed 'third_party/protobuf/' content from commit e35e248
Change-Id: I6cbe123d09fe50fdcad0e51466665daeee7433c7
git-subtree-dir: third_party/protobuf
git-subtree-split: e35e24800fb8d694bdeea5fd63dc7d1b14d68723
diff --git a/csharp/src/Google.Protobuf/Reflection/SingleFieldAccessor.cs b/csharp/src/Google.Protobuf/Reflection/SingleFieldAccessor.cs
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+++ b/csharp/src/Google.Protobuf/Reflection/SingleFieldAccessor.cs
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+#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;
+using Google.Protobuf.Compatibility;
+
+namespace Google.Protobuf.Reflection
+{
+ /// <summary>
+ /// Accessor for single fields.
+ /// </summary>
+ internal sealed class SingleFieldAccessor : FieldAccessorBase
+ {
+ // All the work here is actually done in the constructor - it creates the appropriate delegates.
+ // There are various cases to consider, based on the property type (message, string/bytes, or "genuine" primitive)
+ // and proto2 vs proto3 for non-message types, as proto3 doesn't support "full" presence detection or default
+ // values.
+
+ private readonly Action<IMessage, object> setValueDelegate;
+ private readonly Action<IMessage> clearDelegate;
+
+ internal SingleFieldAccessor(PropertyInfo property, FieldDescriptor descriptor) : base(property, descriptor)
+ {
+ if (!property.CanWrite)
+ {
+ throw new ArgumentException("Not all required properties/methods available");
+ }
+ setValueDelegate = ReflectionUtil.CreateActionIMessageObject(property.GetSetMethod());
+
+ var clrType = property.PropertyType;
+
+ // TODO: Validate that this is a reasonable single field? (Should be a value type, a message type, or string/ByteString.)
+ object defaultValue =
+ descriptor.FieldType == FieldType.Message ? null
+ : clrType == typeof(string) ? ""
+ : clrType == typeof(ByteString) ? ByteString.Empty
+ : Activator.CreateInstance(clrType);
+ clearDelegate = message => SetValue(message, defaultValue);
+ }
+
+ public override void Clear(IMessage message)
+ {
+ clearDelegate(message);
+ }
+
+ public override void SetValue(IMessage message, object value)
+ {
+ setValueDelegate(message, value);
+ }
+ }
+}