public StockManagerImpl(StockManager stockManager)
 {
     this.stockManager        = stockManager;
     stockLocationDao         = StockLocationDao.getInstance();
     stockItemDao             = StockItemDao.getInstance();
     itemManagerImpl          = new ItemManagerImpl();
     buyingInvoiceManagerImpl = new BuyingInvoiceManagerImpl();
 }
 public StockManagerImpl()
 {
     stockLocationDao = StockLocationDao.getInstance();
     stockItemDao     = StockItemDao.getInstance();
 }