[Xalan 1.2J] Parameters in extension functions

[Harald Hett <h....@gis-systemhaus.de>]

Hello!
Can anyone give me a hint, how to get the values of top-level parameters
inside a java extension function for Xalan 1.2?

Thank you!

-- 
Harald Hett <h....@gis-systemhaus.de>
Gesellschaft für integrierte Systemplanung

Re: [Xalan 1.2J] Parameters in extension functions

[Gary L Peskin <ga...@firstech.com>]

Harald Hett wrote:
> 
> Meanwhile I have encountered another possibility that works with the
> first statement ("myext:init($filename)") as well:
> 
>         public String init (ResultTreeFrag frag)
>         {
>                 Node node = frag.getFirstChild();
>                 return "set a parameter to " + node.getNodeValue();
>         }

Harry --

This may work for you.  However, in the general case, the string value
of a DocumentFragment is the concatenation of the string values of all
of the text node descendants in document order.  That's all descendants,
not just children, and may require a deep navigation below the
DocumentFragment.  This is a little more code so I just recommended the
shortcut of string(...) in XSLT so that Xalan was doing all of the tree
walking work.

Gary

Re: [Xalan 1.2J] Parameters in extension functions

[Harald Hett <h....@gis-systemhaus.de>]

Meanwhile I have encountered another possibility that works with the 
first statement ("myext:init($filename)") as well:

        public String init (ResultTreeFrag frag)
        {
                Node node = frag.getFirstChild();
		return "set a parameter to " + node.getNodeValue();
        }       


Harry

Re: [Xalan 1.2J] Parameters in extension functions

[Harald Hett <h....@gis-systemhaus.de>]

Great! 
Now it works. 
I had tried that before with "String($filename)", which did not work 
because of the upper case.

Thank you!

Harry. 


Gary L Peskin wrote:
> 
> Harald Hett wrote:
> > But if I try to use a Parameter like this:
> >
> >         <xsl:value-of select="myext:init($filename)"/>
> >
> > xalan searches for a method with the following signature
> >
> >         public String init (ResultTreeFrag frag);
> >
> > And now I have no idea, how I could get the value from frag.
> 
> The best way to do this in XalanJ1 is:
> 
>  <xsl:value-of select="myext:init(string($filename))"/>
> 
> which should look for the method with the string argument.
> 
> Gary

Re: [Xalan 1.2J] Parameters in extension functions

[Gary L Peskin <ga...@firstech.com>]

Harald Hett wrote:
> But if I try to use a Parameter like this:
> 
>         <xsl:value-of select="myext:init($filename)"/>
> 
> xalan searches for a method with the following signature
> 
>         public String init (ResultTreeFrag frag);
> 
> And now I have no idea, how I could get the value from frag.

The best way to do this in XalanJ1 is:

 <xsl:value-of select="myext:init(string($filename))"/>

which should look for the method with the string argument.

Gary

Re: [Xalan 1.2J] Parameters in extension functions

[Harald Hett <h....@gis-systemhaus.de>]

Thank you Gary,

but I have allready tried that. For instance a method like
	
	public String init (String aParameter)
	{
		return "set a parameter to " + aParameter;
	}	

defines an extension function for the namespace 'myext'.
This works fine if a call from inside the XSL-Script looks like this:
	
	<xsl:value-of select="myext:init('out.log')"/>

But if I try to use a Parameter like this:

	<xsl:value-of select="myext:init($filename)"/>

xalan searches for a method with the following signature
	
	public String init (ResultTreeFrag frag);

And now I have no idea, how I could get the value from frag.

Harry

Gary L Peskin wrote:
> 
> Harald Hett wrote:
> >
> > Hello!
> > Can anyone give me a hint, how to get the values of top-level parameters
> > inside a java extension function for Xalan 1.2?
> 
> Harald --
> 
> You'll need to pass those parameters in as parameters of the extension
> function call.
> 
> Gary

Re: [Xalan 1.2J] Parameters in extension functions

[Gary L Peskin <ga...@firstech.com>]

Harald Hett wrote:
> 
> Hello!
> Can anyone give me a hint, how to get the values of top-level parameters
> inside a java extension function for Xalan 1.2?

Harald --

You'll need to pass those parameters in as parameters of the extension
function call.

Gary