// 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 | |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
using System; | |
using System.Reflection; | |
namespace Google.ProtocolBuffers.FieldAccess | |
{ | |
/// <summary> | |
/// Accessor for a repeated message field. | |
/// | |
/// TODO(jonskeet): Try to extract the commonality between this and SingleMessageAccessor. | |
/// We almost want multiple inheritance... | |
/// </summary> | |
internal sealed class RepeatedMessageAccessor<TMessage, TBuilder> : RepeatedPrimitiveAccessor<TMessage, TBuilder> | |
where TMessage : IMessage<TMessage, TBuilder> | |
where TBuilder : IBuilder<TMessage, TBuilder> | |
{ | |
/// <summary> | |
/// The static method to create a builder for the property type. For example, | |
/// in a message type "Foo", a field called "bar" might be of type "Baz". This | |
/// method is Baz.CreateBuilder. | |
/// </summary> | |
private readonly Func<IBuilder> createBuilderDelegate; | |
internal RepeatedMessageAccessor(string name) : base(name) | |
{ | |
MethodInfo createBuilderMethod = ClrType.GetMethod("CreateBuilder", EmptyTypes); | |
if (createBuilderMethod == null) | |
{ | |
throw new ArgumentException("No public static CreateBuilder method declared in " + ClrType.Name); | |
} | |
createBuilderDelegate = ReflectionUtil.CreateStaticUpcastDelegate(createBuilderMethod); | |
} | |
/// <summary> | |
/// Creates a message of the appropriate CLR type from the given value, | |
/// which may already be of the right type or may be a dynamic message. | |
/// </summary> | |
private object CoerceType(object value) | |
{ | |
ThrowHelper.ThrowIfNull(value, "value"); | |
// If it's already of the right type, we're done | |
if (ClrType.IsInstanceOfType(value)) | |
{ | |
return value; | |
} | |
// No... so let's create a builder of the right type, and merge the value in. | |
IMessageLite message = (IMessageLite) value; | |
return CreateBuilder().WeakMergeFrom(message).WeakBuild(); | |
} | |
public override void SetRepeated(TBuilder builder, int index, object value) | |
{ | |
base.SetRepeated(builder, index, CoerceType(value)); | |
} | |
public override IBuilder CreateBuilder() | |
{ | |
return createBuilderDelegate(); | |
} | |
public override void AddRepeated(TBuilder builder, object value) | |
{ | |
base.AddRepeated(builder, CoerceType(value)); | |
} | |
} | |
} |