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Posted to c-users@xalan.apache.org by Jarek Lubczyński <el...@elkomtech.com.pl> on 2004/12/22 16:24:39 UTC
Sending variablenumber of parameters to stylesheet
Hi everybody.
Before I ask a question, please let me explain the problem.
I'd like to send to stylesheet variable number of parameters, which would be then resolved by
proper stylesheet. For example I have a number of parameters defined in XML file (can be
_any_ number of parameters):
<Params>
<Param nm="t1" vl="11"/>
<Param nm="t2" vl="22"/>
</Params>
I want to transform xml document in a manner which depends on above parameter list
There is a simple way to do this in Java. First I must parse the above doument into
org.w3c.dom.Element object, and then pass this object as a 'value' parameter in method
setParameter( String name, Object value)
of class
javax.xml.transform.Transformer.
And my problem is how to do it using Xalan C++. I _must_ do it in the same (or similar) way
as in java solution described above. I've found class XalanTransformer
(xalanc/XalanTransformer/XalanTransformer.hpp) has got only two instances of method
setStylesheetParam - first using constchar*, and second one using XalanDOMString& as
parameters. And that's all. I have found that XSLTEngineImpl object is used as XSLT processor
and it has a method defined below
XSLTEngineImpl::setStylesheetParam(
const XalanDOMString& key,
XObjectPtr value);
which prototype seems to look like it could be useful to resolve my problem. But I am not sure
this is the proper solution. Moreover, usage of this method requires XalanTransformer module
to be rewritten. But this method is called nowhere in Xalan source code, tests or examples, so
I have no idea how to convert (or assign, whatever) any object having part of XML document (for
example XalanElement*) to XObjectPtr and if it will work. Maybe there's another way of solving
my problem, which I can see now.
Can anybody help me? Thanks in advance,
My current version of Xalan is 1.8 and I haven't yet found any solution of my problem in Xalan
1.9 published today (22 Dec 2004)
--
Greetings
Jarek Lubczynski
There are 10 kinds of people:
Those who understand binary and those who don't
Re: Sending variablenumber of parameters to stylesheet
Posted by Jarek Lubczyński <el...@elkomtech.com.pl>.
On 22 Dec 2004 at 8:59, david_n_bertoni@us.ibm.com wrote:
> > Before I ask a question, please let me explain the problem.
> > I'd like to send to stylesheet variable number of parameters, which
> would be then
> > resolved by proper stylesheet. For example I have a number of
> > parameters
> defined in
> > XML file (can be _any_ number of parameters):
> > <Params>
> > <Param nm="t1" vl="11"/>
> > <Param nm="t2" vl="22"/>
> > </Params>
> > I want to transform xml document in a manner which depends on above
> parameter list
> > There is a simple way to do this in Java. First I must parse the
> > above
> doument into
> > org.w3c.dom.Element object, and then pass this object as a 'value'
> parameter in method
> > setParameter( String name, Object value)
> > of class
> > javax.xml.transform.Transformer.
> > And my problem is how to do it using Xalan C++. I _must_ do it in
> > the
> same (or similar)
> > way as in java solution described above. I've found class
> XalanTransformer
> > (xalanc/XalanTransformer/XalanTransformer.hpp) has got only two
> instances of method
> > setStylesheetParam - first using constchar*, and second one using
> XalanDOMString& as
> > parameters. And that's all. I have found that XSLTEngineImpl object
> > is
> used as XSLT
> > processor and it has a method defined below
> > XSLTEngineImpl::setStylesheetParam(
> > const XalanDOMString& key,
> > XObjectPtr value);
> > which prototype seems to look like it could be useful to resolve my
> problem. But I am
> > not sure this is the proper solution. Moreover, usage of this method
> >
> requires
> > XalanTransformer module to be rewritten. But this method is called
> nowhere in Xalan
> > source code, tests or examples, so I have no idea how to convert (or
> >
> assign, whatever)
> > any object having part of XML document (for example XalanElement*)
> > to
> XObjectPtr and
> > if it will work. Maybe there's another way of solving my problem,
> > which
> I can see now.
> > Can anybody help me?
>
> By the far the most portable and cleanest solution is to pass the URL
> of the document that contains the data, then let the document()
> function load it:
>
> <?xml version="1.0"?>
> <xsl:stylesheet
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> version="1.0">
>
> <xsl:param name="paramsURI" select="''") />
>
> <xsl:variable name="params" select="document($paramsURL)" />
>
> <xsl:template match="/">
> <xsl:copy-of select="$params/Params/Param[@nm='t1']" />
> </xsl:template>
>
> </xsl:stylesheet>
>
> This assume you're going to use XPath to search the parameters. If
> that's not what you're doing, this solution may not be appropriate.
>
> Dave
Thanks Dave, but I'm afraid it's not quite helpful to me. In my case the XML document
containing variable number of xslt parameters never exists as a file (my fault, in I've
written 'XML _file_', but should have 'XML _document_', sorry). It's generated by one
application as an XML, and then passed via tcp socket to another application which
performs XSL transformation, then returns results (in the form of XML document on tcp
as well) to the first one. So I can't pass URL of an XML _file_ as a parameter because
no such a _file_ exists. Of course I could save this XML as a temporary file and then
use it's URL (as you have explained) but it's not a convenient solution for me.
So I would be grateful for further help.
--
Greetings
Jarek Lubczynski
There are 10 kinds of people:
Those who understand binary and those who don't
Re: Sending variablenumber of parameters to stylesheet
Posted by da...@us.ibm.com.
> Before I ask a question, please let me explain the problem.
> I'd like to send to stylesheet variable number of parameters, which
would be then
> resolved by proper stylesheet. For example I have a number of parameters
defined in
> XML file (can be _any_ number of parameters):
> <Params>
> <Param nm="t1" vl="11"/>
> <Param nm="t2" vl="22"/>
> </Params>
> I want to transform xml document in a manner which depends on above
parameter list
> There is a simple way to do this in Java. First I must parse the above
doument into
> org.w3c.dom.Element object, and then pass this object as a 'value'
parameter in method
> setParameter( String name, Object value)
> of class
> javax.xml.transform.Transformer.
> And my problem is how to do it using Xalan C++. I _must_ do it in the
same (or similar)
> way as in java solution described above. I've found class
XalanTransformer
> (xalanc/XalanTransformer/XalanTransformer.hpp) has got only two
instances of method
> setStylesheetParam - first using constchar*, and second one using
XalanDOMString& as
> parameters. And that's all. I have found that XSLTEngineImpl object is
used as XSLT
> processor and it has a method defined below
> XSLTEngineImpl::setStylesheetParam(
> const XalanDOMString& key,
> XObjectPtr value);
> which prototype seems to look like it could be useful to resolve my
problem. But I am
> not sure this is the proper solution. Moreover, usage of this method
requires
> XalanTransformer module to be rewritten. But this method is called
nowhere in Xalan
> source code, tests or examples, so I have no idea how to convert (or
assign, whatever)
> any object having part of XML document (for example XalanElement*) to
XObjectPtr and
> if it will work. Maybe there's another way of solving my problem, which
I can see now.
> Can anybody help me?
By the far the most portable and cleanest solution is to pass the URL of
the document that contains the data, then let the document() function load
it:
<?xml version="1.0"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:param name="paramsURI" select="''") />
<xsl:variable name="params" select="document($paramsURL)" />
<xsl:template match="/">
<xsl:copy-of select="$params/Params/Param[@nm='t1']" />
</xsl:template>
</xsl:stylesheet>
This assume you're going to use XPath to search the parameters. If that's
not what you're doing, this solution may not be appropriate.
Dave