Re: Type of a generic class?

markspace <-@.>
Thu, 02 Aug 2012 20:08:29 -0700
On 8/2/2012 4:27 PM, Donkey Hottie wrote:

It is indeed kind of spooky and strange idea, after all what is so wrong
about simple

     String value = SystemProperties.getString("ParamName") ;

It is OK, but I'm kind of toying with idea of strong typing of System
Parameters: A Date can not be stored as Long or Double etc..

To do something like this, I'd arrange some implementation for the

class Parameter {
   public void processParam( String param ) {
      double d = Double.parse( param ); // or whatever...

And then use a Map as Lew suggests or some other method of binding the
Parameter class to the string "ParamName".

(You could, for example use Class.forName():
   Parameter proc = Class.forName(

or you could use annotations:

class Parameter {...

or any other crazy thing you like. It would probably be better than
what you have now.)

The back end of the system parameters is simply

CREATE TABLE SystemParameters
     name varchar(64) not null primary_key,
     value varchar(512)
) ;

I've written this table definition. In fact it was 23 odd years ago, as
in intern while still in college. I don't know if it's good or bad
practice, but it seems a common idea.

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