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source: trunk/HeuristicLab.ExtLibs/HeuristicLab.ProtobufCS/2.4.1/ProtobufCS/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs @ 17460

Last change on this file since 17460 was 8295, checked in by abeham, 12 years ago

#1897:

  • Removed protocol buffers 0.9.1
  • Added protocol buffers 2.4.1
  • Updated proto processing command
File size: 3.9 KB
Line 
1// Protocol Buffers - Google's data interchange format
2// Copyright 2008 Google Inc.  All rights reserved.
3// http://github.com/jskeet/dotnet-protobufs/
4// Original C++/Java/Python code:
5// http://code.google.com/p/protobuf/
6//
7// Redistribution and use in source and binary forms, with or without
8// modification, are permitted provided that the following conditions are
9// met:
10//
11//     * Redistributions of source code must retain the above copyright
12// notice, this list of conditions and the following disclaimer.
13//     * Redistributions in binary form must reproduce the above
14// copyright notice, this list of conditions and the following disclaimer
15// in the documentation and/or other materials provided with the
16// distribution.
17//     * Neither the name of Google Inc. nor the names of its
18// contributors may be used to endorse or promote products derived from
19// this software without specific prior written permission.
20//
21// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32using System;
33using System.Reflection;
34
35namespace Google.ProtocolBuffers.FieldAccess
36{
37    /// <summary>
38    /// Accessor for fields representing a non-repeated message value.
39    /// </summary>
40    internal sealed class SingleMessageAccessor<TMessage, TBuilder> : SinglePrimitiveAccessor<TMessage, TBuilder>
41        where TMessage : IMessage<TMessage, TBuilder>
42        where TBuilder : IBuilder<TMessage, TBuilder>
43    {
44        /// <summary>
45        /// The static method to create a builder for the property type. For example,
46        /// in a message type "Foo", a field called "bar" might be of type "Baz". This
47        /// method is Baz.CreateBuilder.
48        /// </summary>
49        private readonly Func<IBuilder> createBuilderDelegate;
50
51        internal SingleMessageAccessor(string name) : base(name)
52        {
53            MethodInfo createBuilderMethod = ClrType.GetMethod("CreateBuilder", EmptyTypes);
54            if (createBuilderMethod == null)
55            {
56                throw new ArgumentException("No public static CreateBuilder method declared in " + ClrType.Name);
57            }
58            createBuilderDelegate = ReflectionUtil.CreateStaticUpcastDelegate(createBuilderMethod);
59        }
60
61        /// <summary>
62        /// Creates a message of the appropriate CLR type from the given value,
63        /// which may already be of the right type or may be a dynamic message.
64        /// </summary>
65        private object CoerceType(object value)
66        {
67            ThrowHelper.ThrowIfNull(value, "value");
68            // If it's already of the right type, we're done
69            if (ClrType.IsInstanceOfType(value))
70            {
71                return value;
72            }
73
74            // No... so let's create a builder of the right type, and merge the value in.
75            IMessageLite message = (IMessageLite) value;
76            return CreateBuilder().WeakMergeFrom(message).WeakBuild();
77        }
78
79        public override void SetValue(TBuilder builder, object value)
80        {
81            base.SetValue(builder, CoerceType(value));
82        }
83
84        public override IBuilder CreateBuilder()
85        {
86            return createBuilderDelegate();
87        }
88    }
89}
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