× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  • Subject: RE: HTML to XML, vice versa
  • From: "Fred Kulack" <kulack@xxxxxxxxxx>
  • Date: Fri, 16 Mar 2001 17:02:37 -0600
  • Importance: Normal


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
+---

As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.