public long GetNumberEntriesFor(TableSchema.FixedSizeSchemaIndexDef index, long afterValue, out long totalCount)
{
var fst = GetFixedSizeTree(index);
totalCount = fst.NumberOfEntries;
if (afterValue == 0 || totalCount == 0)
{
return(totalCount);
}
long count = 0;
using (var it = fst.Iterate())
{
if (it.Seek(afterValue) == false)
{
return(0);
}
do
{
if (it.CurrentKey == afterValue)
{
continue;
}
count++;
} while (it.MoveNext());
}
return(count);
}
public void DeleteBackwardFrom(TableSchema.FixedSizeSchemaIndexDef index, long value, long numberOfEntriesToDelete)
{
if (numberOfEntriesToDelete < 0)
{
throw new ArgumentOutOfRangeException(nameof(numberOfEntriesToDelete), "Number of entries should not be negative");
}
if (numberOfEntriesToDelete == 0)
{
return;
}
var toDelete = new List <long>();
var fst = GetFixedSizeTree(index);
using (var it = fst.Iterate())
{
if (it.Seek(value) == false && it.SeekToLast() == false)
{
return;
}
do
{
toDelete.Add(it.CreateReaderForCurrent().ReadLittleEndianInt64());
numberOfEntriesToDelete--;
} while (numberOfEntriesToDelete > 0 && it.MovePrev());
}
foreach (var id in toDelete)
{
Delete(id);
}
}
private FixedSizeTree GetFixedSizeTree(TableSchema.FixedSizeSchemaIndexDef indexDef)
{
if (indexDef.IsGlobal)
{
return(_tx.GetGlobalFixedSizeTree(indexDef.Name, sizeof(long)));
}
var tableTree = _tx.ReadTree(Name);
return(GetFixedSizeTree(tableTree, indexDef.Name, sizeof(long)));
}
private FixedSizeTree GetFixedSizeTree(TableSchema.FixedSizeSchemaIndexDef indexDef)
{
if (indexDef.IsGlobal)
{
return(GetFixedSizeTree(_tx.LowLevelTransaction.RootObjects, indexDef.NameAsSlice, sizeof(long)));
}
var tableTree = _tx.ReadTree(Name);
return(GetFixedSizeTree(tableTree, indexDef.NameAsSlice, sizeof(long)));
}
public IEnumerable <TableValueReader> SeekBackwardFrom(TableSchema.FixedSizeSchemaIndexDef index, long key)
{
var fst = GetFixedSizeTree(index);
using (var it = fst.Iterate())
{
if (it.Seek(key) == false && it.SeekToLast() == false)
{
yield break;
}
do
{
yield return(GetTableValueReader(it));
} while (it.MovePrev());
}
}
public long GetNumberEntriesFor(TableSchema.FixedSizeSchemaIndexDef index)
{
var fst = GetFixedSizeTree(index);
return(fst.NumberOfEntries);
}