/// <summary>
/// Select a controller. The <paramref name="request"/> parameter is guaranteed not to be <c>null</c>.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
protected virtual HttpControllerDescriptor OnSelectController(HttpRequestMessage request)
{
ControllerIdentification controllerName = this.GetControllerIdentificationFromRequest(request);
if (String.IsNullOrEmpty(controllerName.Name))
{
throw new HttpResponseException(request.CreateResponse(HttpStatusCode.NotFound));
}
HttpControllerDescriptor controllerDescriptor;
if (this._controllerInfoCache.Value.TryGetValue(controllerName, out controllerDescriptor))
{
return(controllerDescriptor);
}
ICollection <Type> matchingTypes = this._controllerTypeCache.GetControllerTypes(controllerName);
// ControllerInfoCache is already initialized.
Contract.Assert(matchingTypes.Count != 1);
if (matchingTypes.Count == 0)
{
// no matching types
throw ApiControllerNotFoundException.Create(controllerName);
}
// multiple matching types
throw AmbigiousApiRequestException.Create(controllerName, request.GetRouteData().Route, matchingTypes);
}
private static HttpResponseMessage HandleExceptionInternal(ExceptionContext context, AmbigiousApiRequestException exception) {
if (exception == null) {
return null;
}
// multiple matching types
return context.Request.CreateResponse(HttpStatusCode.InternalServerError, exception.Message);
}
