private bool CanDropQueryXRelation(QueryX qx, Relation re)
{
var(p1, c1) = GetHeadTail(qx);
var(p2, c2) = re.GetHeadTail();
return(p1 == p2 || c1 == c2 || p1 == c2 || c1 == p2);
}
internal bool ComputeXRelationDrop(ComputeX cx, Relation rx, bool doDrop)
{
if (_relation_ComputeX_QueryX.TryGetChild(cx, out QueryX qx1) && _relation_Store_ComputeX.TryGetParent(cx, out Store st) && !_relation_QueryX_QueryX.HasChildLink(qx1))
{
var(head, tail) = rx.GetHeadTail();
if (st == head || st == tail)
{
if (doDrop)
{
_queryXManager.AddComputeXQueryX(cx, qx1, rx, st == tail);
}
return(true);
}
}
return(false);
}
internal bool QueryRelationDrop(QueryX qx1, Relation r2, bool doDrop)
{
if (_relation_Relation_QueryX.TryGetParent(qx1, out Relation r1))
{
var(_, t1) = r1.GetHeadTail();
var(h2, t2) = r2.GetHeadTail();
if (t1 == h2 || t1 == t2)
{
if (doDrop)
{
qx1.IsTail = false;
var qx2 = new QueryX(this, QueryType.Value);
qx2.IsReversed = t1 == t2;
ItemCreated.Record(Owner, qx2);
ItemLinked.Record(Owner, _relation_QueryX_QueryX, qx1, qx2);
ItemLinked.Record(Owner, _relation_Relation_QueryX, r2, qx2);
}
return(true);
}
}
return(false);
}