Very Cool!!!!! Karr, David wrote: >>-----Original Message----- >>From: V. Cekvenich [mailto:[EMAIL PROTECTED]] >>Sent: Wednesday, October 02, 2002 2:22 PM >>To: [EMAIL PROTECTED] >>Subject: HTML-EL >> >> >>I am lazy, so feel free not to answer since I can loook it up >>in source. >>It is easier to ask I say as a "newbie": >> >>Did the html-el tag extend html tag so changes in html tag are >>propogated or did it fork? > > > Every tag class in the Struts-EL library is a subclass of the Struts tag. > The TLD has to be separate, as they haven't designed inheritance into the > TLD yet :) . > > All of the tag classes are very similar, in that the "doStartTag()" method > calls a method called "evaluateExpressions()", and then calls > "super.doStartTag()". The "evaluateExpressions()" method processes all the > string-valued attributes through the EL, and then calls the attribute > setters. If you looked at all the tag classes, you'd start to wonder where > all the code is :) . All Struts-EL does is replace the attribute value > evaluation process. > > Otherwise, the subclasses use the base classes for all functionality. > > The only thing that I can't automatically track (without changing the code > and TLD) is if the base tag adds or removes attributes, or changes their > types. I seriously considered writing a code generator to generate the > library, to avoid this problem, but I decided it wasn't worth it.
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