docs: protected void setTextAndClassToExpression(JRDesignExpression expression, DJGroupVariable var, AbstractColumn col, String variableName) {
  
  		if (var.getValueFormatter() != null){
  			expression.setText(var.getTextForValueFormatterExpression(variableName));
  			expression.setValueClassName(var.getValueFormatter().getClassName());
  		}
  		else if (col.getTextFormatter() != null) {
  
  			expression.setText("$V{" + variableName + "}");
  			expression.setValueClassName(col.getVariableClassName(var.getOperation()));
  		}
  		else {
  			expression.setText("$V{" + variableName + "}");
  			expression.setValueClassName(col.getVariableClassName(var.getOperation()));
  		}
  	}