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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;
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", Type.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) {
// 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.
IMessage message = (IMessage) 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));
}
}
}
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