protobuf/csharp/src/Google.Protobuf.JsonDump/Program.cs

#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 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.IO;
using System.Reflection;

namespace Google.Protobuf.ProtoDump
{
    /// <summary>
    /// Small utility to load a binary message and dump it in JSON format.
    /// </summary>
    internal class Program
    {
        private static int Main(string[] args)
        {
            if (args.Length != 2)
            {
                Console.Error.WriteLine("Usage: Google.Protobuf.JsonDump <descriptor type name> <input data>");
                Console.Error.WriteLine("The descriptor type name is the fully-qualified message name,");
                Console.Error.WriteLine("including assembly e.g. ProjectNamespace.Message,Company.Project");
                return 1;
            }
            Type type = Type.GetType(args[0]);
            if (type == null)
            {
                Console.Error.WriteLine("Unable to load type {0}.", args[0]);
                return 1;
            }
            if (!typeof(IMessage).GetTypeInfo().IsAssignableFrom(type))
            {
                Console.Error.WriteLine("Type {0} doesn't implement IMessage.", args[0]);
                return 1;
            }
            IMessage message = (IMessage) Activator.CreateInstance(type);
            using (var input = File.OpenRead(args[1]))
            {
                message.MergeFrom(input);
            }
            Console.WriteLine(message);
            return 0;
        }
    }
}