RE: HTML to XML, vice versa

Thanks a MILLION, Fred!  This makes sense and even worked like a charm!
It's pretty amazing stuff!

Brad

> -----Original Message-----
> From: Fred Kulack [mailto:kulack@us.ibm.com]
> Sent: Friday, March 16, 2001 5:03 PM
> To: JAVA400-L@midrange.com
> Subject: RE: HTML to XML, vice versa
> 
> 
> 
> Ah... You are about to see the light. That method's code is 
> hard to think
> about
> because its only a method definition, NOT any code.
> 
> Yank all the stuff you had in your FieldFormatter class OUT,
> and change FieldFormatter to an "interface".
> Create XMLFieldFormatter and HTMLFieldFormatter that 'implements'
> FieldFormatter.
> Put the code that was in FieldFormatter into the appropriate
> *FieldFormatter
> object and create the other one with new code.
> i.e.
> the toML() method in FieldFormatter. Only looks like a 
> function prototype,
> it contains no code, and is only used to call the derived class.
> 
> Suddenly, polymorphism!
> User code:
> Field     obj = new Field();
> obj.setFormatter(new XMLFieldFormatter());
> OR
> obj.setFormatter(new HTMLFieldFormatter());
> String theString = obj.toML();
> 
> public interface FieldFormatter {
>    public String toML(); /* note, no code in an interface */
> }
> 
> public class HTMLFieldFormatter implements FieldFormatter {
>   public String toML() {
>      return "<p>" + blah + </p>;
>   }
> }
> 
> public class XMLFieldFormatter implements FieldFormatter {
>   public String toML() {
>      return "<xml>" + blah + "</xml>";
>   }
> }
> 
> public class Field {
>   protected FieldFormatter formatter = null;  (not sure if 
> this is correct)
>   ...
>   public void setFormatter(FieldFormatter fieldFormatter) {
>     formatter = fieldFormatter;
>   }
>   public String toML() {
>     return formatter.toML();
>   }
> }
> 
> 
> 
> "The stuff we call "software" is not like anything that human society
>   is used to thinking about. Software is something like a machine, and
>   something like mathematics, and something like language, and
>   something like thought, and art, and information...
>   but software is not in fact any of those other things."
> Bruce Sterling - The Hacker Crackdown
> 
> Fred A. Kulack  -  AS/400e  Java and Java DB2 access, Jdbc, 
> JTA, etc...
> IBM in Rochester, MN  (Phone: 507.253.5982   T/L 553-5982)
> mailto:kulack@us.ibm.com   Personal: mailto:kulack@bresnanlink.net
> AOL Instant Messenger: Home:FKulack  Work:FKulackWrk
> 
> +---
> | This is the JAVA/400 Mailing List!
> | To submit a new message, send your mail to JAVA400-L@midrange.com.
> | To subscribe to this list send email to JAVA400-L-SUB@midrange.com.
> | To unsubscribe from this list send email to 
> JAVA400-L-UNSUB@midrange.com.
> | Questions should be directed to the list owner: joe@zappie.net
> +---
> 
+---
| This is the JAVA/400 Mailing List!
| To submit a new message, send your mail to JAVA400-L@midrange.com.
| To subscribe to this list send email to JAVA400-L-SUB@midrange.com.
| To unsubscribe from this list send email to JAVA400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner: joe@zappie.net
+---