Re: [Pvmanager-devel] org.epics.pvmanager.data.Display

[Marty K. <mrk...@co...>]

  On 08/30/2010 10:28 AM, Carcassi, Gabriele wrote:
> Hi Marty,
>
>>   The method
>> NumberFormat getFormat();
>> Is very Java specific.
> Yes, it's intended. This way we can "hide" the different implementations
> for CA 3 and CA V. The data on the wire (and on the server) is indeed a
> String for pvData (the current precision for CA 3).
>


OK now I get it. Thus implement something like the following:

public class MumberFormatTest extends TestCase {

     public void testNumberFormat() {
         NumberFormat nf = new NumberFormatDouble("%12.2f");
         StringBuffer sb = new StringBuffer();
         FieldPosition fp = new FieldPosition(0);
         sb = nf.format(1.12, sb, fp);
         System.out.println(sb.toString());
         ParsePosition pp = new ParsePosition(0);
         double xxx = (nf.parse(sb.toString(),pp)).doubleValue();
         System.out.println("parse is "+ xxx);
     }

     static class NumberFormatDouble extends NumberFormat {
         private final String format;

         private NumberFormatDouble (String format) {
             this.format = format;
         }
         @Override
         public StringBuffer format(double arg0, StringBuffer 
arg1,FieldPosition arg2) {
             return arg1.append(String.format(format, arg0));
         }
         @Override
         public StringBuffer format(long arg0, StringBuffer 
arg1,FieldPosition arg2) {
             throw new IllegalArgumentException("long not supported");
         }
         @Override
         public Number parse(String arg0, ParsePosition arg1) {
             return Double.parseDouble(arg0.substring(arg1.getIndex()));
         }
     }
}

Marty

> Gabriele
>
> -----Original Message-----
> From: Marty Kraimer [mailto:mrk...@co...]
> Sent: Monday, August 30, 2010 10:14 AM
> To: pvm...@li...
> Subject: [Pvmanager-devel] org.epics.pvmanager.data.Display
>
>
>    The method
>
> NumberFormat getFormat();
>
> Is very Java specific.
>
> Instead how about
>
> String getFormat();
>
> Use C style formats. Examples are  "14.2e", "14.2f","10d"
>
> All of these will work on both c, c++, and Java (since java supports
> printf).
>
> Marty
>
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