toStringOrNull

v 1.0
    private static String toStringOrNull(Object o) {
            if(o instanceof String)
                return (!"".equals(o) && o != null) ? (String)o : "";
            else if(o instanceof Date)
                return (o != null) ? new SimpleDateFormat("dd-MM-yyyy").format(o) : "";
            else
                return ( o != null)? o.toString() : "";
    }

V 2.10

private static String toStringOrNull(Object o) {
        return (o != null) ? o.toString() : "";
    }

    private static String toStringOrNull(String o) {
        return (o != null  &&
                o.length()>0
                && !"null".equalsIgnoreCase(o))
                ? (String) o : "";
    }

    private static String toStringOrNull(Date o) {
        return (o != null) ? new SimpleDateFormat("dd-MM-yyyy").format(o) : "";
    }

    private static String toStringOrNull(Date o, String formatStr) {
        return (o != null) ? new SimpleDateFormat(formatStr).format(o) : "";
    }

    private static String toStringOrNull(BigDecimal o, Boolean flagNumDecimale) {
        if (flagNumDecimale){
            if(o != null){
                if( ( o.doubleValue() % 1) == 0) //se non ha decimali
                    return Integer.valueOf(o.intValue()).toString() + ",00";
                else{
                    String[] splitter = o.toString().split("\\.");
                    splitter[0].length();
                    if( splitter[1].length() < 2)
                        return o.toString()+"0";
                }
            }
            else
                return "0,00";

//          return (o != null) ?
//          ( ((((BigDecimal) o).doubleValue() % 1) == 0) ?
//          o.toString() + ",00"
//          : o.toString())
//          : "";
        }

        return  o!= null ? o.toString() : "";

    }

    private static String toStringOrNull(Double o, Boolean flagNumDecimale) {
        if (flagNumDecimale){
            if(o != null){
                if( ( ( (Double) o).doubleValue() % 1) == 0) //se non ha decimali
                    return Integer.valueOf(o.intValue()).toString() + ",00";
                else{

                    String[] splitter = o.toString().split("\\.");
                    splitter[0].length();
                    if( splitter[1].length() < 2)
                        return o.toString()+"0";
//                  double x = o - Math.floor(o);
//                  x = x - (int) x * 10;
//                  x = Math.pow(x, 10);
//                  //se ha un decimale aggiungo uno 0
//                  return x <= 9 ? o.toString()+"0" : o.toString();
                }
            }else
                return "0,00";

//          return (o != null) ? ( ((((Double) o).doubleValue() % 1) == 0) ? Integer
//                  .valueOf(o.intValue()).toString() + ",00"
//                  : o.toString() )
//                  : "";
        }
            return (o != null) ? o.toString() : "";
    }

    private static double doubleOrNull(Object o){
        if(o!= null){
            int scale = (int) Math.pow(10, 3);
            return (double) Math.round((Double)o * scale) / scale;
        }
        return (Double)0.00;
    }

    private static double doubleOrNull(BigDecimal o){
        if(o!= null){
            int scale = (int) Math.pow(10, 3);
            return (double) Math.round(o.doubleValue() * scale) / scale;
        }
        return (Double)0.00;
    }