Hello,
I'm currently working on an extension class for use in an XSL file.
The transformation I want to perform is the following:
Input fragment:
<floatlist>0 1 2 3 4 5 6 7 8</floatlist>
Output fragment:
<vec3 value="0 1 2"/>
<vec3 value="3 4 5"/>
<vec3 value="6 7 8"/>
As to my knowledge there is no way to get this working in XSLT directly
(and because for the project behind it there is some more processing
required than shown above anyway), I wrote an extension function to do
this, and invoke it with this XSL fragment:
<xsl:for-each select="floatlist">
<xsl:value-of value="ext:makevec3s(.)"/>
</xsl:for-each>
So the extension function is called for each <floatlist/> element, takes
it's contents as a string, and creates a number of <vec3/> elements in a
DocumentFragment instance.
However, although the function itself seems works fine, it appears as if
Xalan simply discards the returned DocumentFragment.
I've included the source code and XML/XSL files at the end of this email
I'd be gratetful for any clues :)
Cheers,
Uwe
---- input.xml ----
<?xml version="1.0" encoding="UTF-8"?>
<root>
<floatlist>0 1 2 3 4 5 6 7 8</floatlist>
<floatlist>9 10 11 12 13 14</floatlist>
</root>
---- exttest.xsl ----
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:ext="xalanexttest.Ext" version="1.0">
<xsl:template match="/">
<vectors>
<xsl:for-each select="root/floatlist">
<xsl:value-of select="ext:makevec3s(.)"/>
</xsl:for-each>
</vectors>
</xsl:template>
</xsl:stylesheet>
---- Ext.java ----
package xalanexttest;
import org.w3c.dom.*;
import org.w3c.dom.bootstrap.*;
public class Ext {
static DOMImplementation domImpl;
static Document doc;
static {
try{
DOMImplementationRegistry reg =
DOMImplementationRegistry.newInstance();
domImpl = reg.getDOMImplementation("XML 1.0");
doc =
domImpl.createDocument("http://pachler.name/sibengine";, "foo", null);
} catch(ClassNotFoundException ex){
} catch(InstantiationException ex){
} catch(IllegalAccessException ex){
}
}
/** Creates a new instance of Ext */
public Ext() {
}
/**
* @param args the command line arguments
*/
public static void main(String[] argv){
org.apache.xalan.xslt.Process.main(argv);
}
public DocumentFragment makevec3s(String in){
DocumentFragment dfrag = doc.createDocumentFragment();
// test float array, no need to show parsing code here
float[] floats = {0, 1, 2, 3, 4, 5, 6, 7, 8};
for(int i=2; i<floats.length; i+=3){
Element v3Element = doc.createElement("vec3");
String value = ""+floats[i-2]+' '+floats[i-1]+' '+floats[i];
v3Element.setAttribute("value", value);
dfrag.appendChild(v3Element);
}
return dfrag;
}
}
---- output.xml - the output that is produced by Xalan-J ----
<?xml version="1.0" encoding="UTF-8"?>
<vectors xmlns:ext="xalanexttest.Ext"/>
