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#region Copyright notice and license
// 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.
#endregion
using System;
namespace Google.ProtocolBuffers
{
/// <summary>
/// Grab-bag of utility functions useful when dealing with RPCs.
/// </summary>
public static class RpcUtil
{
/// <summary>
/// Converts an Action[IMessage] to an Action[T].
/// </summary>
public static Action<T> SpecializeCallback<T>(Action<IMessage> action)
where T : IMessage<T>
{
return message => action(message);
}
/// <summary>
/// Converts an Action[T] to an Action[IMessage].
/// The generalized action will accept any message object which has
/// the same descriptor, and will convert it to the correct class
/// before calling the original action. However, if the generalized
/// callback is given a message with a different descriptor, an
/// exception will be thrown.
/// </summary>
public static Action<IMessage> GeneralizeCallback<TMessage, TBuilder>(Action<TMessage> action,
TMessage defaultInstance)
where TMessage : class, IMessage<TMessage, TBuilder>
where TBuilder : IBuilder<TMessage, TBuilder>
{
return message =>
{
TMessage castMessage = message as TMessage;
if (castMessage == null)
{
castMessage = defaultInstance.CreateBuilderForType().MergeFrom(message).Build();
}
action(castMessage);
};
}
}
}
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