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using Google.ProtocolBuffers.Descriptors;
using System;
using System.Collections.Generic;
using System.Reflection;
namespace Google.ProtocolBuffers {
public static class GeneratedExtension {
public static GeneratedExtension<TContainer, TExtension> CreateExtension<TContainer, TExtension>(FieldDescriptor descriptor)
where TContainer : IMessage<TContainer> {
if (descriptor.IsRepeated) {
throw new ArgumentException("Must call CreateRepeatedGeneratedExtension() for repeated types.");
}
return new GeneratedExtension<TContainer, TExtension>(descriptor);
}
public static GeneratedExtension<TContainer, IList<TExtension>> CreateRepeatedExtension<TContainer, TExtension>(FieldDescriptor descriptor)
where TContainer : IMessage<TContainer> {
if (descriptor.IsRepeated) {
throw new ArgumentException("Must call CreateRepeatedGeneratedExtension() for repeated types.");
}
return new GeneratedExtension<TContainer, IList<TExtension>>(descriptor);
}
}
/// <summary>
/// Base class for all generated extensions.
/// </summary>
/// <remarks>
/// The protocol compiler generates a static singleton instance of this
/// class for each extension. For exmaple, imagine a .proto file with:
/// <code>
/// message Foo {
/// extensions 1000 to max
/// }
///
/// extend Foo {
/// optional int32 bar;
/// }
/// </code>
/// Then MyProto.Foo.Bar has type GeneratedExtension<MyProto.Foo,int>.
/// <para />
/// In general, users should ignore the details of this type, and
/// simply use the static singletons as parmaeters to the extension accessors
/// in ExtendableMessage and ExtendableBuilder.
/// </remarks>
public class GeneratedExtension<TContainer, TExtension> where TContainer : IMessage<TContainer> {
private readonly IMessage messageDefaultInstance;
private readonly FieldDescriptor descriptor;
internal GeneratedExtension(FieldDescriptor descriptor) {
if (!descriptor.IsExtension) {
throw new ArgumentException("GeneratedExtension given a regular (non-extension) field.");
}
this.descriptor = descriptor;
switch (descriptor.MappedType) {
case MappedType.Message:
PropertyInfo defaultInstanceProperty = typeof(TExtension)
.GetProperty("DefaultInstance", BindingFlags.Static | BindingFlags.Public);
if (defaultInstanceProperty == null) {
throw new ArgumentException("No public static DefaultInstance property for type " + typeof(TExtension).Name);
}
messageDefaultInstance = (IMessage) defaultInstanceProperty.GetValue(null, null);
break;
case MappedType.Enum:
// FIXME(jonskeet): May not need this
//enumValueOf = getMethodOrDie(type, "valueOf",
// EnumValueDescriptor.class);
//enumGetValueDescriptor = getMethodOrDie(type, "getValueDescriptor");
messageDefaultInstance = null;
break;
default:
messageDefaultInstance = null;
break;
}
}
public FieldDescriptor Descriptor {
get { return descriptor; }
}
public IMessage MessageDefaultInstance {
get { return messageDefaultInstance; }
}
internal object SingularFromReflectionType(object p) {
throw new System.NotImplementedException();
}
internal object FromReflectionType(object value) {
throw new System.NotImplementedException();
}
}
}
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