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author | Jon Skeet <skeet@pobox.com> | 2008-10-22 13:30:34 +0100 |
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committer | Jon Skeet <skeet@pobox.com> | 2008-10-22 13:30:34 +0100 |
commit | 6803686bc06c4d96afd9bd2637f7b37a58596699 (patch) | |
tree | 4b21c563f4cd4e399fbc0b253bc2f15e822eae88 /src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs | |
parent | f0589506c96600dcd01319b9d1929d87505f3daa (diff) | |
download | protobuf-6803686bc06c4d96afd9bd2637f7b37a58596699.tar.gz protobuf-6803686bc06c4d96afd9bd2637f7b37a58596699.tar.bz2 protobuf-6803686bc06c4d96afd9bd2637f7b37a58596699.zip |
First cut at new layout
Diffstat (limited to 'src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs')
-rw-r--r-- | src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs b/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs new file mode 100644 index 00000000..5aa9f777 --- /dev/null +++ b/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs @@ -0,0 +1,66 @@ +// 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 fields representing a non-repeated message value. + /// </summary> + internal sealed class SingleMessageAccessor<TMessage, TBuilder> : SinglePrimitiveAccessor<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 SingleMessageAccessor(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 SetValue(TBuilder builder, object value) { + base.SetValue(builder, CoerceType(value)); + } + + public override IBuilder CreateBuilder() { + return createBuilderDelegate(); + } + } +}
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