Added DynamicMessage and ExtendableBuilder, along with the first supporting tests.

1 files changed, 147 insertions, 0 deletions

diff --git a/csharp/ProtocolBuffers/ExtendableBuilder.cs b/csharp/ProtocolBuffers/ExtendableBuilder.cs
new file mode 100644
index 00000000..3f5a8162
--- /dev/null
+++ b/csharp/ProtocolBuffers/ExtendableBuilder.cs
@@ -0,0 +1,147 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Google.ProtocolBuffers.Descriptors;
+
+namespace Google.ProtocolBuffers {
+  public abstract class ExtendableBuilder<TMessage, TBuilder> : GeneratedBuilder<TMessage, TBuilder>
+    where TMessage : ExtendableMessage<TMessage, TBuilder>
+    where TBuilder : GeneratedBuilder<TMessage, TBuilder> {
+
+    protected ExtendableBuilder() {}
+
+    /// <summary>
+    /// Checks if a singular extension is present
+    /// </summary>
+    public bool HasExtension<TExtension>(GeneratedExtensionBase<TMessage, TExtension> extension) {
+      return MessageBeingBuilt.HasExtension(extension);
+    }
+
+    /// <summary>
+    /// Returns the number of elements in a repeated extension.
+    /// </summary>
+    public int GetExtensionCount<TExtension>(GeneratedExtensionBase<TMessage, IList<TExtension>> extension) {
+      return MessageBeingBuilt.GetExtensionCount(extension);
+    }
+
+    /// <summary>
+    /// Returns the value of an extension.
+    /// </summary>
+    public TExtension GetExtension<TExtension>(GeneratedExtensionBase<TMessage, TExtension> extension) {
+      return MessageBeingBuilt.GetExtension(extension);
+    }
+
+    /// <summary>
+    /// Returns one element of a repeated extension.
+    /// </summary>
+    public TExtension GetExtension<TExtension>(GeneratedExtensionBase<TMessage, IList<TExtension>> extension, int index) {
+      return MessageBeingBuilt.GetExtension(extension, index);
+    }
+
+    /// <summary>
+    /// Sets the value of an extension.
+    /// </summary>
+    public ExtendableBuilder<TMessage, TBuilder> SetExtension<TExtension>(GeneratedExtensionBase<TMessage, TExtension> extension, TExtension value) {
+      ExtendableMessage<TMessage, TBuilder> message = MessageBeingBuilt;
+      message.VerifyExtensionContainingType(extension);
+      message.Extensions[extension.Descriptor] = extension.ToReflectionType(value);
+      return this;
+    }
+
+    /// <summary>
+    /// Sets the value of one element of a repeated extension.
+    /// </summary>
+    public ExtendableBuilder<TMessage, TBuilder> SetExtension<TExtension>(
+        GeneratedExtensionBase<TMessage, IList<TExtension>> extension, int index, Type value) {
+      ExtendableMessage<TMessage, TBuilder> message = MessageBeingBuilt;
+      message.VerifyExtensionContainingType(extension);
+      message.Extensions[extension.Descriptor, index] = extension.SingularToReflectionType(value);
+      return this;
+    }
+
+    /// <summary>
+    /// Appends a value to a repeated extension.
+    /// </summary>
+    public ExtendableBuilder<TMessage, TBuilder> AddExtension<TExtension>(
+        GeneratedExtensionBase<TMessage, IList<TExtension>> extension, TExtension value) {
+      ExtendableMessage<TMessage, TBuilder> message = MessageBeingBuilt;
+      message.VerifyExtensionContainingType(extension);
+      message.Extensions.AddRepeatedField(extension.Descriptor, extension.SingularToReflectionType(value));
+      return this;
+    }
+
+    /// <summary>
+    /// Clears an extension.
+    /// </summary>
+    public ExtendableBuilder<TMessage, TBuilder> ClearExtension<TExtension>(
+        GeneratedExtensionBase<TMessage, TExtension> extension) {
+      ExtendableMessage<TMessage, TBuilder> message = MessageBeingBuilt;
+      message.VerifyExtensionContainingType(extension);
+      message.Extensions.ClearField(extension.Descriptor);
+      return this;
+    }
+
+    /// <summary>
+    /// Called by subclasses to parse an unknown field or an extension.
+    /// </summary>
+    /// <returns>true unless the tag is an end-group tag</returns>
+    protected override bool ParseUnknownField(CodedInputStream input, UnknownFieldSet.Builder unknownFields,
+        ExtensionRegistry extensionRegistry, uint tag) {
+      return FieldSet.MergeFieldFrom(input, unknownFields, extensionRegistry, this, tag);
+    }
+
+    // ---------------------------------------------------------------
+    // Reflection
+
+
+    public override object this[FieldDescriptor field, int index] {
+      set {
+        if (field.IsExtension) {
+          ExtendableMessage<TMessage, TBuilder> message = MessageBeingBuilt;
+          // TODO(jonskeet): Figure out how to call this!
+          // message.VerifyExtensionContainingType(field);
+          message.Extensions[field, index] = value;
+        } else {
+          base[field, index] = value;
+        }
+      }
+    }
+
+    
+    public override object this[FieldDescriptor field] {
+      set {
+        if (field.IsExtension) {
+          ExtendableMessage<TMessage, TBuilder> message = MessageBeingBuilt;
+          // TODO(jonskeet): Figure out how to call this!
+          // message.VerifyExtensionContainingType(field);
+          message.Extensions[field] = value;
+        } else {
+          base[field] = value;
+        }
+        InternalFieldAccessors[field].SetValue(this, value);
+      }
+    }
+
+    public override IBuilder<TMessage> ClearField(FieldDescriptor field) {
+      if (field.IsExtension) {
+        ExtendableMessage<TMessage, TBuilder> message = MessageBeingBuilt;
+        message.VerifyContainingType(field);
+        message.Extensions.ClearField(field);
+        return this;
+      } else {
+        return base.ClearField(field);
+      }
+    }
+
+    public override IBuilder<TMessage> AddRepeatedField(FieldDescriptor field, object value) {
+      if (field.IsExtension) {
+        ExtendableMessage<TMessage, TBuilder> message = MessageBeingBuilt;
+        message.VerifyContainingType(field); 
+        message.Extensions.AddRepeatedField(field, value);
+        return this;
+      } else {
+        return base.AddRepeatedField(field, value);
+      }
+    }
+  }
+}