/**
* Gets the {@link SharedValueRecordBase} record if it should be encoded immediately after the
* formula record Contained in the specified {@link FormulaRecordAggregate} agg. Note - the
* shared value record always appears after the first formula record in the group. For arrays
* and tables the first formula is always the in the top left cell. However, since shared
* formula groups can be sparse and/or overlap, the first formula may not actually be in the
* top left cell.
*
* @return the SHRFMLA, TABLE or ARRAY record for the formula cell, if it is the first cell of
* a table or array region. <code>null</code> if the formula cell is not shared/array/table,
* or if the specified formula is not the the first in the group.
*/
public SharedValueRecordBase GetRecordForFirstCell(FormulaRecordAggregate agg)
{
CellReference firstCell = agg.FormulaRecord.Formula.ExpReference;
// perhaps this could be optimised by consulting the (somewhat unreliable) isShared flag
// and/or distinguishing between tExp and tTbl.
if (firstCell == null)
{
// not a shared/array/table formula
return(null);
}
int row = firstCell.Row;
int column = firstCell.Col;
if (agg.Row != row || agg.Column != column)
{
// not the first formula cell in the group
return(null);
}
SharedFormulaGroup[] groups = GetGroups();
for (int i = 0; i < groups.Length; i++)
{
// note - logic for Finding correct shared formula group is slightly
// more complicated since the first cell
SharedFormulaGroup sfg = groups[i];
if (sfg.IsFirstCell(row, column))
{
return(sfg.SFR);
}
}
// Since arrays and tables cannot be sparse (all cells in range participate)
// The first cell will be the top left in the range. So we can match the
// ARRAY/TABLE record directly.
for (int i = 0; i < _tableRecords.Length; i++)
{
TableRecord tr = _tableRecords[i];
if (tr.IsFirstCell(row, column))
{
return(tr);
}
}
for (int i = 0; i < _arrayRecords.Length; i++)
{
ArrayRecord ar = _arrayRecords[i];
if (ar.IsFirstCell(row, column))
{
return(ar);
}
}
return(null);
}
private static SharedFormulaGroup FindFormulaGroup(SharedFormulaGroup[] groups, CellReference firstCell)
{
int row = firstCell.Row;
int column = firstCell.Col;
// Traverse the list of shared formulas and try to find the correct one for us
// perhaps this could be optimised to some kind of binary search
for (int i = 0; i < groups.Length; i++)
{
SharedFormulaGroup svg = groups[i];
if (svg.IsFirstCell(row, column))
{
return(svg);
}
}
// TODO - fix file "15228.xls" so it opens in Excel after rewriting with POI
throw new Exception("Failed to find a matching shared formula record");
}
