accessing numerical attribute values

["John A. Mitchell" <ja...@scico.sandia.gov>]

I am a so-called newbie at this -- here goes.

I am trying to exract the value "double startTime" from the xml below.  
I have an "Element" but don't know
how to "decode" or "transcode" the attribute value into a "double"

<timeBlock>
<startTime value="0.336"/>
<timeIncrement value=".0003"/>
</timeBlock>

double getStarTimet(Element e){
          
            String startTime = new String("startTime");
            String value = e.getAttribute(startTime);
            double value = ????
            return value;
}

Also, when I print "value"; say like "System.out.println(value)" I get 
an empty string?
Can someone point me in the right direction here?

Here is the c++ that I have effectively used in the past (but now I need 
the Java):
double Jpp_ParsedValues::getDoubleAttribute(DOMElement* e, const char* 
name){
 
  // This function retrieves the value of the attribute "name" on the 
element
  const XMLCh* start = XMLString::transcode(name);
  const XMLCh* c =  e->getAttribute( start );
  delete start;

  char* s = XMLString::transcode(c);
  double value = atof(s);
  delete s;

  return value;

}


Now I need to do this in "Java" using xerces-j

I don't know where to look to figure this out.







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Re: accessing numerical attribute values

[Andy Clark <an...@apache.org>]

John A. Mitchell wrote:
>  double value = atof(s);
>  [...]
> 
> Now I need to do this in "Java" using xerces-j
> 
> I don't know where to look to figure this out.

This really isn't the right forum for this question because
it's really about Java programming. But, to answer your
question, try:

   double value = Double.parseDouble(s);

It will throw a NumberFormatException if it's bad and you
need to catch that exception.

-- 
Andy Clark * andyc@apache.org



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