[jdom-interest] instanceof

[Syloke Soong]

Another addendum.

The hypothetical code I wrote is erroneous, because I don't have a way
to translate the content class provided by getContentType() into a
polymorphic call. 

Perhaps like getContentType().newInstance(), which means that all
Content objects would need to have a reflective newInstance() method to
produce the polymorphic signature cheating flag.

Still, I persist that using a polymorphic signature cheating flag is
nonetheless cheating. It exploits polymorphic registry of the platform
to allow the method to pretend it is polymorphic.

In the following (Text e) and (Element e) are used as the polymorphic
signature cheating flags and Object o is the actual Object to be
digested.

[hypothetical code]
....
  {
    Content citrus = citr.next();
    Consume(citrus.getContentType().newInstance(), citrus);
  }
....

public Consume(Text e, Object o){...}
public Consume(Element e, Object o){...}
 
[/hypothetical code]


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