/// <summary>
/// get a valid parameter object by checking for it in the previously retrieved data store or by finding it based on the information provided by the user
/// </summary>
/// <param name="paramName">the parameter to retrieve</param>
/// <param name="context"></param>
/// <returns></returns>
public virtual IParameterResult LookupParam(IFieldParameter param, IConversationContext context)
{
var c = context.GetCurrentConversation();
var storedValue = c.Data.ContainsKey(param.ParamName)
? c.Data[param.ParamName]
: null;
if (storedValue != null && !storedValue.IsIncomplete)
{
return(ResultFactory.GetSuccess(storedValue.DisplayName, storedValue.Value));
}
string value = SearchUserValues(param.ParamName, context);
if (string.IsNullOrEmpty(value))
{
return(ResultFactory.GetFailure());
}
var paramResult = param.GetParameter(value, context);
if (paramResult.HasFailed)
{
return(paramResult);
}
if (IsParamRequest(param.ParamName, c)) // clear any request for this property
{
c.Data.Remove(ReqParam);
}
c.Data[param.ParamName] = new ParameterData {
DisplayName = paramResult.DisplayName, Value = paramResult.DataValue
};
return(ResultFactory.GetSuccess(paramResult.DisplayName, paramResult.DataValue));
}
