public static FilterExpressionData JoinFilters(eAndOrJoin andOrJoin, params FilterExpressionData[] filters)
{
List <FilterExpressionData> lFilters = filters.Distinct <FilterExpressionData>().ToList <FilterExpressionData>();
lFilters.RemoveAll(item => item == null);
if (lFilters.Count == 0)
{
return(new FltGroupExprData(andOrJoin)); //return empty and group filter
}
if (lFilters.Count == 1)
{
return(lFilters[0].Clone()); //return the only provided filter
}
FltGroupExprData groupFilter = null;
foreach (var flt in lFilters)//check if in collection already exist an and filter
{
if (flt is FltGroupExprData)
{
groupFilter = flt as FltGroupExprData;
if (groupFilter.AndOr == andOrJoin)
{
break;
}
else
{
groupFilter = null;
}
}
}
if (groupFilter == null)
{
return(Filter.And(new FltGroupExprData(andOrJoin,
lFilters.ToArray())));
}
else //if yes, add to him the rest expression and return it.
{
lFilters.Remove(groupFilter);
groupFilter = groupFilter.Clone() as FltGroupExprData;
foreach (var flt in lFilters)
{
if (!groupFilter.FilterExpressions.Contains(flt))
{
groupFilter.FilterExpressions.Add(flt.Clone());
}
}
return(groupFilter);
}
}
public static FilterExpressionData operator &(FilterExpressionData f1, FilterExpressionData f2)
{
return(Filter.And(f1, f2));
}
