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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>
/// Reflection access for a oneof, allowing clear and "get case" actions.
/// </summary>
public sealed class OneofAccessor
{
private readonly Func<IMessage, int> caseDelegate;
private readonly Action<IMessage> clearDelegate;
private OneofDescriptor descriptor;
internal OneofAccessor(PropertyInfo caseProperty, MethodInfo clearMethod, OneofDescriptor descriptor)
{
if (!caseProperty.CanRead)
{
throw new ArgumentException("Cannot read from property");
}
this.descriptor = descriptor;
caseDelegate = ReflectionUtil.CreateFuncIMessageT<int>(caseProperty.GetGetMethod());
this.descriptor = descriptor;
clearDelegate = ReflectionUtil.CreateActionIMessage(clearMethod);
}
/// <summary>
/// Gets the descriptor for this oneof.
/// </summary>
/// <value>
/// The descriptor of the oneof.
/// </value>
public OneofDescriptor Descriptor { get { return descriptor; } }
/// <summary>
/// Clears the oneof in the specified message.
/// </summary>
public void Clear(IMessage message)
{
clearDelegate(message);
}
/// <summary>
/// Indicates which field in the oneof is set for specified message
/// </summary>
public FieldDescriptor GetCaseFieldDescriptor(IMessage message)
{
int fieldNumber = caseDelegate(message);
if (fieldNumber > 0)
{
return descriptor.ContainingType.FindFieldByNumber(fieldNumber);
}
return null;
}
}
}
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