XPATH Processor in java code

[Sharang Thorat]

Hello
i have an xml which i want to sort on certain elements
as specified by user GUI.
i intend to follow following steps

1. convert xml to another xml using XPATH processor
here sorting crieterion from user will be applied.
2. apply xslt on that xml and display

i could achive the step 2 in my code

File xmlfile = new File(file_path.concat("\\temp.xml"));
File stylesheet = new File(file_path.concat("\\rsdstylesheet.xsl"));

FileInputStream in = new FileInputStream(xmlfile);
FileInputStream xslfile = new FileInputStream(stylesheet);


XSLTProcessor processor = XSLTProcessorFactory.getProcessor();
//StylesheetRoot parsedStyleSheet = null;

//parsedStyleSheet = processor.processStylesheet( new XSLTInputSource( xslfile ) );
//processor.setStylesheet(parsedStyleSheet);
try{
processor.process(new XSLTInputSource(in),new XSLTInputSource(xslfile),new XSLTResultTarget(out));
}catch (Exception e)
{
System.out.println("******************************************");
e.printStackTrace();
}

but how to cheive step one. How to apply the user selected crieterion for sorting on the xml and using XPath convert it
to anohter xml. i know how to do it on command line
using org.apache.xalan.xpath.Process class but is there any implementation for that class to call it through the programme
like XSLTProcessor class.
regards
sharang