First cut at new layout

1 files changed, 74 insertions, 0 deletions

diff --git a/src/ProtocolBuffers/FieldAccess/RepeatedMessageAccessor.cs b/src/ProtocolBuffers/FieldAccess/RepeatedMessageAccessor.cs
new file mode 100644
index 00000000..35d7b1a8
--- /dev/null
+++ b/src/ProtocolBuffers/FieldAccess/RepeatedMessageAccessor.cs
@@ -0,0 +1,74 @@
+// 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));
+    }
+  }
+}