/// <summary>
/// Dynamically creates a factory of<see cref="THandler"/>s and adds to the given <see cref="dictionary"/>.
/// </summary>
private void AddFactory <THandler, TItem>
(
IDictionary <string, IFactory <THandler, TItem> > dictionary,
HandlerTypes handlerType,
HandlerFactoryTypeArguments typeArgs,
FieldDefinition definition
)
where THandler : IFieldHandler <TItem>
where TItem : class
{
try
{
Type typeDefinition = GetFactoryTypeDefinition(handlerType, typeArgs.IsCollection);
Type[] typeArguments = GetFactoryTypeArgs <TItem>(typeArgs, definition).ToArray();
Type factoryType = typeDefinition.MakeGenericType(typeArguments);
var autoActivator = new AutoActivator(new SubstemHandlerDependencyResolver(typeArgs.GetterExpression, definition));
var factory = (IFactory <THandler, TItem>)autoActivator.CreateInstance(factoryType);
dictionary.Add(definition.FieldName, factory);
}
catch (Exception ex)
{
string message = "Cannot add " + handlerType + " factory for this " + (typeArgs.IsCollection ? "collection" : "item");
throw new StemAttributeSetupException(message, ex);
}
}
private IEnumerable <Type> GetFactoryTypeArgs <TItem>(HandlerFactoryTypeArguments typeArgs, FieldDefinition definition)
{
yield return(typeof(TItem));
yield return(typeArgs.PropertyValueType);
// By convention, all the collection types have 4 generic type parameters.
// The 3rd parameter is the TNav, because the property type above becomes TCollection.
if (typeArgs.IsCollection)
{
yield return(typeArgs.EnumerableTypeArgument);
}
yield return(definition.SubstemType);
}
public void Analyze <TItem>(EngineImplementations <TItem> implementations, FieldDefinition definition)
where TItem : class
{
if (definition.SubstemType == null)
{
return;
}
LambdaExpression getterExpression = definition.Getter.Expression;
if (getterExpression == null)
{
throw new StemAttributeSetupException("Substem types must be on an expression property.");
}
var typeArgs = new HandlerFactoryTypeArguments();
typeArgs.LoadExpression <TItem>(getterExpression);
AddFactory(implementations.FullResourceFactories, HandlerTypes.FullResource, typeArgs, definition);
AddFactory(implementations.ReaderFactories, HandlerTypes.Reader, typeArgs, definition);
AddFactory(implementations.WriterFactories, HandlerTypes.Writer, typeArgs, definition);
}
