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-rw-r--r--csharp/src/ProtocolBuffers/MessageUtil.cs109
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diff --git a/csharp/src/ProtocolBuffers/MessageUtil.cs b/csharp/src/ProtocolBuffers/MessageUtil.cs
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--- a/csharp/src/ProtocolBuffers/MessageUtil.cs
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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;
-using System.Reflection;
-
-namespace Google.ProtocolBuffers
-{
- /// <summary>
- /// Utilities for arbitrary messages of an unknown type. This class does not use
- /// generics precisely because it is designed for dynamically discovered types.
- /// </summary>
- public static class MessageUtil
- {
- /// <summary>
- /// Returns the default message for the given type. If an exception is thrown
- /// (directly from this code), the message will be suitable to be displayed to a user.
- /// </summary>
- /// <param name="type"></param>
- /// <exception cref="ArgumentNullException">The type parameter is null.</exception>
- /// <exception cref="ArgumentException">The type doesn't implement IMessage, or doesn't
- /// have a static DefaultMessage property of the same type, or is generic or abstract.</exception>
- /// <returns></returns>
- public static IMessage GetDefaultMessage(Type type)
- {
- if (type == null)
- {
- throw new ArgumentNullException("type", "No type specified.");
- }
- if (type.IsAbstract || type.IsGenericTypeDefinition)
- {
- throw new ArgumentException("Unable to get a default message for an abstract or generic type (" +
- type.FullName + ")");
- }
- if (!typeof(IMessage).IsAssignableFrom(type))
- {
- throw new ArgumentException("Unable to get a default message for non-message type (" + type.FullName +
- ")");
- }
- PropertyInfo property = type.GetProperty("DefaultInstance",
- BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
- if (property == null)
- {
- throw new ArgumentException(type.FullName + " doesn't have a static DefaultInstance property");
- }
- if (property.PropertyType != type)
- {
- throw new ArgumentException(type.FullName + ".DefaultInstance property is of the wrong type");
- }
- return (IMessage) property.GetValue(null, null);
- }
-
- /// <summary>
- /// Returns the default message for the type with the given name. This is just
- /// a convenience wrapper around calling Type.GetType and then GetDefaultMessage.
- /// If an exception is thrown, the message will be suitable to be displayed to a user.
- /// </summary>
- /// <param name="typeName"></param>
- /// <exception cref="ArgumentNullException">The typeName parameter is null.</exception>
- /// <exception cref="ArgumentException">The type doesn't implement IMessage, or doesn't
- /// have a static DefaultMessage property of the same type, or can't be found.</exception>
- public static IMessage GetDefaultMessage(string typeName)
- {
- if (typeName == null)
- {
- throw new ArgumentNullException("typeName", "No type name specified.");
- }
- Type type = Type.GetType(typeName);
- if (type == null)
- {
- throw new ArgumentException("Unable to load type " + typeName);
- }
- return GetDefaultMessage(type);
- }
- }
-} \ No newline at end of file