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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.
// http://code.google.com/p/protobuf/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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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