Re: HTML to XML, vice versa

["Fred Kulack" <kulack@xxxxxxxxxx>]

On 03/06/2001 at 01:29:23 PM, owner-java400-l@midrange.com wrote:
I can do it easily because I use a decorator class that in turn uses a
factory class.  To do this, I break down the data stream into something
abstract:

A "table" has a "table header" and a "table trailer", and between those has
0-N "tablerows"

A "tablerow" has a "tablerow header" and a "tablerow trailer", and between
those, has 0-n "tablecells"

A "tablecell" has a "tablecell header" and a "tablecell trailer", and
between those has element data

The decorator class invokes methods from the factory interface to get the
value of, for instance, a "tablecell header".  At runtime I plug in either
an HTML factory or an XML factory.  The HTML factory returns "<td>", while
the XML factory would return "<datatag>".
-- end of excerpt --

I'd just like to add for Java/OO rookies out there:
  Read the above again and understand it. If you
  don't, ask questions about it.
  It will REALLY help you.

It's a fundamental wonder of OO development: Polymorphism.

You don't know if you're doing XML or HTML and you
DON'T CARE. All you have is this decorator object that
come from somewhere and it does its thing.



"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

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