public string Translate(FilterExpressionSettings e)
{
var template = GetTemplate(e.Operation);
var @operator = GetOperator(e.Operator);
var operand = e.Operand;
return(string.Format(template, @operator, operand));
}
private IFilterExpression Create(FilterExpressionSettings item)
{
var type = (from t in Assembly.GetAssembly(typeof(IFilter)).GetTypes()
where t.GetCustomAttribute <FilterAttribute>() != null &&
t.IsClass &&
(t.GetCustomAttribute <FilterAttribute>()?.Name ?? "") == item.Operation.ToLower() &&
t.GetInterfaces().Any(e => e == typeof(IFilterExpression))
select t).FirstOrDefault();
if (type != null)
{
var filter = (BaseFilter)Activator.CreateInstance(type);
filter.Type = item.Operation;
filter.Operator = item.Operator;
filter.Operand = item.Operand;
return(filter);
}
else
{
return(new EmptyFilter());
}
}
