/*
* public override BaseMultiset GetMultiset(Store store)
* {
* return Materialize().GetMultiset(store);
* }
*/
public Accumulator Materialize()
{
var ret = new Accumulator(this);
foreach (var row in Rows)
{
ret.AddRow(row);
}
return(ret);
}
public override IAccumulator BuildAccumulator(IEnumerable <string> variables)
{
var acc = new Accumulator(variables, SortVariables);
var variableIndexes = new int[_matchLength];
for (int i = 0; i < _matchLength; i++)
{
variableIndexes[i] = acc.Columns.IndexOf(SortVariables[i]);
}
if (_matchEnumerations.Count == 1)
{
return(new VirtualizingAccumulator(acc.Columns, _matchEnumerations[0], variableIndexes, SortVariables));
}
bool keepGoing = true;
ulong[] toMatch = new ulong[_matchLength];
foreach (var enumerator in _matchEnumerations)
{
keepGoing &= enumerator.MoveNext();
if (CompareArrays(enumerator.Current, toMatch) > 0)
{
toMatch = enumerator.Current;
}
}
while (keepGoing)
{
for (int i = 0; i < _matchEnumerations.Count; i++)
{
while (keepGoing && CompareArrays(toMatch, _matchEnumerations[i].Current) > 0)
{
keepGoing &= _matchEnumerations[i].MoveNext();
}
if (keepGoing && CompareArrays(_matchEnumerations[i].Current, toMatch) > 0)
{
toMatch = _matchEnumerations[i].Current;
}
}
if (keepGoing && _matchEnumerations.All(x => CompareArrays(toMatch, x.Current) == 0))
{
// Bingo!
var newRow = new ulong[acc.Columns.Count];
for (int i = 0; i < _matchLength; i++)
{
newRow[variableIndexes[i]] = toMatch[i];
}
acc.AddRow(newRow);
keepGoing &= _matchEnumerations[0].MoveNext();
toMatch = _matchEnumerations[0].Current;
}
}
return(acc);
}
private IAccumulator Product(IAccumulator other)
{
var product = new Accumulator(Columns, BoundVariables.Union(other.BoundVariables));
/*
* IEnumerable<ulong[]> outerEnumerator, innerEnumerator;
* if (this.HighestBoundColumnIndex < other.HighestBoundColumnIndex)
* {
* outerEnumerator = this.Rows;
* innerEnumerator = other.Rows;
* }
* else
* {
* // This accumulator needs to be inner, so if it is a virtual one we need to materialize it first
* if (this is VirtualizingAccumulator)
* {
* return (this as VirtualizingAccumulator).Materialize().Product(other);
* }
* outerEnumerator = other.Rows;
* innerEnumerator = this.Rows;
* }
* foreach(var outer in outerEnumerator)
* {
* foreach(var inner in innerEnumerator)
* {
* product.AddRow(RowJoin(outer, inner));
* }
* }
*/
IEnumerable <ulong[]> outerEnumerator = this.Rows;
IEnumerable <ulong[]> innerEnumerator = other.Rows;
foreach (var outer in outerEnumerator)
{
foreach (var inner in innerEnumerator)
{
product.AddRow(RowJoin(outer, inner));
}
}
// Update the sort order for the product
product.SortOrder = this.SortOrder;
foreach (var sortCol in other.SortOrder)
{
if (!product.SortOrder.Contains(sortCol))
{
product.SortOrder.Add(sortCol);
}
}
return(product);
}
public override IAccumulator BuildAccumulator(IEnumerable <string> variables)
{
var acc = new Accumulator(variables, _triplePatterns[0].Variables.Take(1));
var varIx = acc.Columns.IndexOf(_triplePatterns[0].Variables[0]);
bool keepGoing = true;
ulong[] topItems = new ulong[_matchEnumerations.Count];
ulong toMatch = 0;
for (int i = 0; i < _matchEnumerations.Count; i++)
{
keepGoing &= _matchEnumerations[i].MoveNext();
if (!keepGoing)
{
break;
}
topItems[i] = _matchEnumerations[i].Current;
if (topItems[i] > toMatch)
{
toMatch = topItems[i];
}
}
while (keepGoing)
{
for (int i = 0; i < _matchEnumerations.Count; i++)
{
while (_matchEnumerations[i].Current < toMatch && keepGoing)
{
keepGoing &= _matchEnumerations[i].MoveNext();
}
if (keepGoing && _matchEnumerations[i].Current > toMatch)
{
toMatch = _matchEnumerations[i].Current;
}
}
if (keepGoing && _matchEnumerations.All(x => x.Current.Equals(toMatch)))
{
// Bingo!
var newRow = new ulong[acc.Columns.Count];
newRow[varIx] = toMatch;
acc.AddRow(newRow);
keepGoing &= _matchEnumerations[0].MoveNext();
toMatch = _matchEnumerations[0].Current;
}
}
return(acc);
}
public override IAccumulator BuildAccumulator(IEnumerable <string> variables)
{
var acc = new Accumulator(variables, SortVariables);
var variableIndexes = new int[_matchLength];
for (int i = 0; i < _matchLength; i++)
{
variableIndexes[i] = acc.Columns.IndexOf(SortVariables[i]);
}
foreach (var triple in _store.MatchAllTriples(_graphUris))
{
var newRow = new ulong[acc.Columns.Count];
for (int i = 0; i < _matchLength; i++)
{
newRow[variableIndexes[i]] = triple[i];
}
acc.AddRow(newRow);
}
return(acc);
}
private static IAccumulator JoinSorted(IAccumulator outer, IAccumulator inner)
{
var output = new Accumulator(outer, inner);
IEnumerator <ulong[]> outerEnumerator = outer.Rows.GetEnumerator();
if (inner is VirtualizingAccumulator)
{
inner = (inner as VirtualizingAccumulator).Materialize();
}
var innerAcc = inner as Accumulator;
RewindableListEnumerator <ulong[]> innerEnumerator = innerAcc.RewindableEnumerator;
//IEnumerator<ulong[]> innerEnumerator = inner.Rows.GetEnumerator();
bool keepGoing = outerEnumerator.MoveNext() && innerEnumerator.MoveNext();
while (keepGoing)
{
while (keepGoing && RowMatch(outerEnumerator.Current, innerEnumerator.Current))
{
output.AddRow(RowJoin(outerEnumerator.Current, innerEnumerator.Current));
innerEnumerator.SetMark();
bool innerKeepGoing = innerEnumerator.MoveNext();
while (innerKeepGoing && RowMatch(outerEnumerator.Current, innerEnumerator.Current))
{
output.AddRow(RowJoin(outerEnumerator.Current, innerEnumerator.Current));
innerKeepGoing = innerEnumerator.MoveNext();
}
innerEnumerator.RewindToMark();
keepGoing = outerEnumerator.MoveNext();
}
if (keepGoing)
{
var cmp = RowCompare(outerEnumerator.Current, innerEnumerator.Current);
while (cmp != 0 && keepGoing)
{
keepGoing = cmp > 0 ? innerEnumerator.MoveNext() : outerEnumerator.MoveNext();
if (keepGoing)
{
cmp = RowCompare(outerEnumerator.Current, innerEnumerator.Current);
}
}
}
if (!keepGoing)
{
keepGoing = outerEnumerator.MoveNext();
if (keepGoing)
{
innerEnumerator.Reset();
keepGoing &= innerEnumerator.MoveNext();
}
}
/*
* while (keepGoing && RowCompare(outerEnumerator.Current, innerEnumerator.Current) < 0)
* keepGoing = outerEnumerator.MoveNext();
* while (keepGoing && RowCompare(outerEnumerator.Current, innerEnumerator.Current) > 0)
* keepGoing = innerEnumerator.MoveNext();
*/
}
return(output);
}
