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81 lines
3.6 KiB
81 lines
3.6 KiB
#region Copyright notice and license
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// Protocol Buffers - Google's data interchange format
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// Copyright 2015 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#endregion
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using System;
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using System.Reflection;
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using Google.Protobuf.Compatibility;
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namespace Google.Protobuf.Reflection
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{
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/// <summary>
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/// Accessor for single fields.
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/// </summary>
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internal sealed class SingleFieldAccessor : FieldAccessorBase
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{
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// All the work here is actually done in the constructor - it creates the appropriate delegates.
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// There are various cases to consider, based on the property type (message, string/bytes, or "genuine" primitive)
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// and proto2 vs proto3 for non-message types, as proto3 doesn't support "full" presence detection or default
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// values.
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private readonly Action<IMessage, object> setValueDelegate;
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private readonly Action<IMessage> clearDelegate;
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internal SingleFieldAccessor(PropertyInfo property, FieldDescriptor descriptor) : base(property, descriptor)
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{
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if (!property.CanWrite)
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{
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throw new ArgumentException("Not all required properties/methods available");
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}
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setValueDelegate = ReflectionUtil.CreateActionIMessageObject(property.GetSetMethod());
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var clrType = property.PropertyType;
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// TODO: Validate that this is a reasonable single field? (Should be a value type, a message type, or string/ByteString.)
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object defaultValue =
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descriptor.FieldType == FieldType.Message ? null
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: clrType == typeof(string) ? ""
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: clrType == typeof(ByteString) ? ByteString.Empty
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: Activator.CreateInstance(clrType);
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clearDelegate = message => SetValue(message, defaultValue);
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}
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public override void Clear(IMessage message)
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{
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clearDelegate(message);
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}
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public override void SetValue(IMessage message, object value)
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{
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setValueDelegate(message, value);
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}
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}
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}
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