skip x:parse, apply x:out straight to a pre-build DOM instance

2002-11-14 Thread matsuhashi 

Hello,

I am wondering if it is possible in JSTL 

A usual use of JSLT XML tags goes as
(1) by x:parse var=MyDOM ... tag, parse a XML document in String to
obtain DOM instance in the scoped attribute specified by attribute var,
(2) by x:out select=${MyDOM}///, pull the contents as String to
show view.

Consider a case where a org.w3c.dom.Document object has been created and
stored within a request scope attribute before the JSP is invoked.
In MVC architecture, this situation is likely to happen. Actually I want to
do this in Struts : a Structs Action class produces a DOM and store it in
the request scope, then forward to a JSP.

In this situation I want to skip calling x:parse and apply x:out to the
pre-built DOM instance.

The reason why I want to skip is simple: avoid unnecessary XML parsing for
better performance. If I have a DOM already, then why do I have to
serialize the DOM into a String to pass to x:parse tag!?

I have tried to find out if this is possible in various resources, but no
such article/documentation I could find.

I also tried such coding :

c:set var=MyDOM value=${prebuild_DOM}/
x:out select=${MyDOM}//*/

then I was welcomed by a NullPointerException.

Any idea?



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Re: skip x:parse, apply x:out straight to a pre-build DOM instance

2002-11-14 Thread Shawn Bayern 
On Thu, 14 Nov 2002 [EMAIL PROTECTED] wrote:

 I also tried such coding :
 
 c:set var=MyDOM value=${prebuild_DOM}/
 x:out select=${MyDOM}//*/
 
 then I was welcomed by a NullPointerException.

You can do it, but the syntax you're using is wrong.  The JSTL tags don't
care whether the DOM you're using has come from x:parse or from a
servlet.  But either way, you must refer to it using XPath variables, not
the JSTL EL inside the 'select' attribute.  Thus, you'd write

 x:out select=$MyDOM//* /

-- 
Shawn Bayern
JSTL in Action   http://www.manning.com/bayern


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Re: skip x:parse, apply x:out straight to a pre-build DOM instance

2002-11-14 Thread matsuhashi 

Thank you very much for your reply. It worked!

 MATSUHASHI,kazuaki
 QUICK Corp,
 Japan




   
   
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On Thu, 14 Nov 2002 [EMAIL PROTECTED] wrote:

 I also tried such coding :

 c:set var="MyDOM" value="${prebuild_DOM}"/
 x:out select="${MyDOM}//*"/

 then I was welcomed by a NullPointerException.

You can do it, but the syntax you're using is wrong.  The JSTL tags don't
care whether the DOM you're using has come from x:parse or from a
servlet.  But either way, you must refer to it using XPath variables, not
the JSTL EL inside the 'select' attribute.  Thus, you'd write

 x:out select="$MyDOM//*" /

--
Shawn Bayern
"JSTL in Action"   http://www.manning.com/bayern


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mailto:[EMAIL PROTECTED]
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