public static IEnumerable GetSortedQueryResultSet <TKey, TValue>(List <KeyValuePair <object, object> > list,
PagingPredicate pagingPredicate, IterationType iterationType)
{
if (list.Count == 0)
{
return(new List <KeyValuePair <TKey, TValue> >());
}
var comparator = NewComparer(pagingPredicate.Comparer, iterationType);
list.Sort(comparator);
var nearestAnchorEntry = pagingPredicate.GetNearestAnchorEntry();
var nearestPage = nearestAnchorEntry.Key;
var page = pagingPredicate.Page;
var pageSize = pagingPredicate.PageSize;
var begin = pageSize * (page - nearestPage - 1);
var size = list.Count;
if (begin > size)
{
return(new List <KeyValuePair <TKey, TValue> >());
}
SetAnchor(list, pagingPredicate, nearestPage);
var subList = list.GetRange(begin, Math.Min(pageSize, list.Count - begin));
switch (iterationType)
{
case IterationType.Key:
return(subList.Select(pair => pair.Key));
case IterationType.Value:
return(subList.Select(pair => pair.Value));
case IterationType.Entry:
return(subList.Select(pair => new KeyValuePair <TKey, TValue>((TKey)pair.Key, (TValue)pair.Value)));
default:
throw new ArgumentOutOfRangeException("iterationType", iterationType, null);
}
}
public static SortedQueryResultSet <TKey, TValue> GetSortedQueryResultSet <TKey, TValue>(ISet <KeyValuePair <TKey, TValue> > list,
PagingPredicate <TKey, TValue> pagingPredicate, IterationType iterationType)
{
if (list == null || list.Count == 0)
{
return(new SortedQueryResultSet <TKey, TValue>());
}
IComparer <KeyValuePair <TKey, TValue> > comparer = SortingUtil.NewComparator(pagingPredicate.GetComparator(), iterationType);
List <KeyValuePair <TKey, TValue> > sortedList = new List <KeyValuePair <TKey, TValue> >();
sortedList.AddRange(list);
sortedList.Sort(comparer);
KeyValuePair <int, KeyValuePair <TKey, TValue> > nearestAnchorEntry = pagingPredicate.GetNearestAnchorEntry();
int nearestPage = nearestAnchorEntry.Key;
int page = pagingPredicate.GetPage();
int pageSize = pagingPredicate.GetPageSize();
int begin = pageSize * (page - nearestPage - 1);
int size = sortedList.Count;
if (begin > size)
{
return(new SortedQueryResultSet <TKey, TValue>());
}
int end = begin + pageSize;
if (end > size)
{
pageSize = size - begin;
}
SetAnchor(sortedList, pagingPredicate, nearestPage);
List <KeyValuePair <TKey, TValue> > subList = sortedList.GetRange(begin, pageSize);
return(new SortedQueryResultSet <TKey, TValue>(comparer, subList, iterationType));
}