/**
* Produces a writable copy of the workbook passed in by
* creating copies of each sheet in the specified workbook and adding
* them to its own record
*
* @param w the workbook to copy
*/
private void copyWorkbook(Workbook w)
{
int numSheets = w.getNumberOfSheets();
wbProtected = w.isProtected();
Sheet s = null;
WritableSheetImpl ws = null;
for (int i = 0; i < numSheets; i++)
{
s = w.getSheet(i);
ws = (WritableSheetImpl)createSheet(s.getName(), i, false);
ws.copy(s);
}
}