private static Predicate CreateDelegate(FilterTypes filters)
{
//Sort predicates by heaviness
Expression resultExpression = null;
FilterTypes sexStatusFilter = (filters & FilterTypes.sex_status_all_types);
if (sexStatusFilter != FilterTypes.empty)
{
resultExpression = ExpressionCache[sexStatusFilter];
}
filters = filters.ResetFlags(sexStatusFilter);
foreach (FilterTypes filterType in filters.EnumerateSetFlags())
{
var expression = ExpressionCache[filterType];
if (resultExpression == null)
{
resultExpression = expression;
}
else
{
resultExpression = Expression.AndAlso(resultExpression, expression);
}
}
return(Expression
.Lambda <Predicate>(resultExpression, AccountParameter, QueryParameter)
.Compile(false));
}
private static Predicate Fallback(FilterTypes filters)
{
if (MissesCache.TryGetValue(filters, out Predicate result))
{
return(result);
}
result = CreateDelegate(filters);
if (MissesCache.TryAdd(filters, result))
{
IEnumerable <string> elements = filters.EnumerateSetFlags().Select(x => $"{nameof(FilterTypes)}.{x}");
Console.WriteLine(string.Join(" | ", elements) + ",");
}
return(result);
}
