98 lines
4.1 KiB
C#
98 lines
4.1 KiB
C#
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#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 LC.Google.Protobuf.Compatibility;
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namespace LC.Google.Protobuf.Reflection
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{
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/// <summary>
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/// Reflection access for a oneof, allowing clear and "get case" actions.
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/// </summary>
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public sealed class OneofAccessor
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{
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private readonly Func<IMessage, int> caseDelegate;
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private readonly Action<IMessage> clearDelegate;
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private OneofAccessor(OneofDescriptor descriptor, Func<IMessage, int> caseDelegate, Action<IMessage> clearDelegate)
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{
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Descriptor = descriptor;
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this.caseDelegate = caseDelegate;
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this.clearDelegate = clearDelegate;
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}
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internal static OneofAccessor ForRegularOneof(
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OneofDescriptor descriptor,
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PropertyInfo caseProperty,
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MethodInfo clearMethod) =>
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new OneofAccessor(
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descriptor,
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ReflectionUtil.CreateFuncIMessageInt32(caseProperty.GetGetMethod()),
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ReflectionUtil.CreateActionIMessage(clearMethod));
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internal static OneofAccessor ForSyntheticOneof(OneofDescriptor descriptor)
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{
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// Note: descriptor.Fields will be null when this method is called, because we haven't
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// cross-linked yet. But by the time the delegates are called by user code, all will be
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// well. (That's why we capture the descriptor itself rather than a field.)
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return new OneofAccessor(descriptor,
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message => descriptor.Fields[0].Accessor.HasValue(message) ? descriptor.Fields[0].FieldNumber : 0,
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message => descriptor.Fields[0].Accessor.Clear(message));
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}
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/// <summary>
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/// Gets the descriptor for this oneof.
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/// </summary>
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/// <value>
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/// The descriptor of the oneof.
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/// </value>
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public OneofDescriptor Descriptor { get; }
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/// <summary>
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/// Clears the oneof in the specified message.
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/// </summary>
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public void Clear(IMessage message) => clearDelegate(message);
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/// <summary>
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/// Indicates which field in the oneof is set for specified message
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/// </summary>
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public FieldDescriptor GetCaseFieldDescriptor(IMessage message)
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{
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int fieldNumber = caseDelegate(message);
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return fieldNumber > 0
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? Descriptor.ContainingType.FindFieldByNumber(fieldNumber)
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: null;
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}
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}
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}
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