public static String getAttributeKeyInMapByCell(final Cell cell) {
		if (cell == null) {
			return null;
		}
		// map's key is sheetName!$columnIndex$rowIndex
		return cell.getSheet().getSheetName() + "!"
				+ CellUtility.getCellIndexNumberKey(cell);

	}
public static String getAttributeKeyInMapByCell(final Cell cell) {
		if (cell == null) {
			return null;
		}
		
		return cell.getSheet().getSheetName() + "!"
				+ CellUtility.getCellIndexNumberKey(cell);

	}
public static String getAttributeKeyInMapByCell ( final Cell cell ) { if ( cell == null ) { return null ; } // map's key is sheetName!$columnIndex$rowIndex
 return cell . getSheet ( ) . getSheetName ( ) + "!" + CellUtility . getCellIndexNumberKey ( cell ) ; }
get attribute key in map by cell.

@param cell
input cell.
@return key.
get attribute key in map by cell .