code: protected void detectTypes(ImportMatrix matrix) {
          for (int row = 0; row < matrix.getNumberOfRows(); row++) {
              for (int column = 0; column < matrix.getNumberOfColumns(); column++) {
                  ImportCell cell = matrix.getCell(row, column);
                  if (cell != null && cell.getInterpretation() == null) {
                      cell.setInterpretation(cellContentInterpreter.interpretString(cell.getContent()));
                  }
  
              }
          }
  
      }
docs: Detect types of each cell of the matrix
  @param matrix matrix