Re: [jelly] bringing a jelly::core variable into an jelly::xml xpath

[Dan Ochs]

I got the following to work for my input testme.xml as shown below:

<j:jelly xmlns:j="jelly:core" xmlns:ant="jelly:ant" xmlns:x="jelly:xml">
  <x:parse var="groups" xml="testme.xml"/>
  <j:set var="dollar" value="$"/>
  <j:set var="groupName" value="MyGroup"/>
  <j:set var="inStr">${dollar}groups//[EMAIL PROTECTED]'${groupName}']/@</j:set>
  <x:set var="mode" select="${inStr}mode"/>
  <j:set var="desc"><x:expr select="${inStr}desc"/></j:set>
  <ant:echo>Group ${groupName}: ${desc} - Mode: <x:expr 
select="$mode"/></ant:echo>
</j:jelly>

testme.xml:
<contentGroups>
  <group desc="Desc 1" mode="HIGH" name="MyGroup"/>
</contentGroups>
output is:
    [echo] Group MyGroup: Desc 1 - Mode: HIGH
thanks, dan


From: Bill Keese <[EMAIL PROTECTED]>
Reply-To: "Jakarta Commons Users List" <[EMAIL PROTECTED]>
To: Jakarta Commons Users List <[EMAIL PROTECTED]>
Subject: Re: [jelly] bringing a jelly::core variable into an jelly::xml 
xpath
Date: Mon, 18 Aug 2003 09:38:16 +0900

Paul, I'm having trouble understanding your suggestion.  Are you suggesting 
that the following should work?

<xml:set var="input" 
select="$groups//[EMAIL PROTECTED]'${userEnteredExpression}']/@desc"/>

(and also the following should work)

<xml:set var="input" select="${userEnteredExpression}" />

I think I tried that once and it didn't work.  Also, Dan tried that in his 
original example in this e-mail thread, and it didn't work for him either.

> I think xml:parse accepts strings for source.
But xml:parse doesn't evaluate X-path expressions.  It is for reading in 
XML documents.  X-Path expressions work via xml:set or xml:expr, right?

Bill

Paul Libbrecht wrote:

Dan Ochs wrote:

I have tried <xml:set var="input" 
select="$groups//[EMAIL PROTECTED]'content']/@desc"/> and it works, but I was 
trying to make my example simple.
What if 'content' above is a variable that the user enters at the command 
line during execution?


You would have to parse it the same way. I think xml:parse accepts strings 
for source.

Or if I want to allow the user to enter

an entire xpath?


select="${userEnteredExpression}"

Now you see why the xpath expression is not in ${}...

Paul



From: Paul Libbrecht <[EMAIL PROTECTED]>
Reply-To: "Jakarta Commons Users List" <[EMAIL PROTECTED]>
To: Jakarta Commons Users List <[EMAIL PROTECTED]>
Subject: Re: [jelly] bringing a jelly::core variable into an jelly::xml 
xpath
Date: Thu, 14 Aug 2003 15:31:51 +0200

Dan Ochs wrote:

I'm trying to figure out a way to pass a variable from a jelly::core 
var into a jelly::xml XPath expression.  The document loading and 
parsing is working correctly. The following code does not raise an 
exception, but also does not return anything.  Any other combination I 
try rasises various exceptions, null pointer being the most common.
thanks for the help, dan

xml:
<groups>
  <group desc="I am your content description" name="content"/>
</groups>
jelly:
<xml:parse var="groups" xml="groups.xml"/>
<jelly:set 
var="input">$groups//[EMAIL PROTECTED]'content']/@desc</jelly:set>
<jelly:set var="desc">
  <xml:expr select="${input}"/>
</jellt:set>




Dan,

Have you tried, instead of <jelly:set var="input">... the following ?

<xml:set var="input" select="$groups//[EMAIL PROTECTED]'content']/@desc"/>



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