Re: Can input xml and stylesheet be passed as strings to

From: David_Marston@xxxxxxxxx
Subject: Re: Can input xml and stylesheet be passed as strings to 
Xalan?

David Marston writes:
>Dmitre Novatchev writes:
>>I am trying to call the methods of some key Xalan's classes in such
>>a way as to be able to pass the xml input and the xsl stylesheet as
>>strings.
>
>On the page
>http://xml.apache.org/xalan/usagepatterns.html
>it says that the XSLTInputSource can use a character stream (of the
>java.io.Reader class). Does that meet your needs?
>.................David Marston

Thanks David,
Yes they say this, but the only example, which is given and really
works is for the output stream.

Here is my code -- it seems a little long, but the important code is in
the doTransform() method(at the end):
------------------------------------

import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.Constructor;
import org.apache.xalan.xslt.*;
import org.apache.xalan.xpath.xml.*;
import org.apache.xalan.xslt.res.XSLTErrorResources;
// import org.apache.xalan.xpath.xml.xml4j.*;

import org.w3c.dom.*;


public class myStartingXSLTProcessor
{

  /**
   * The XML Parser Liaison.
   */
  XMLParserLiaison m_liaison = null;
  XSLTProcessor m_processor = null;

  /**
   * @serial
   */
  private String m_styleURL;

  /**
   * @serial
   */
  private String m_documentURL;

  // Parameter names.  To change a name of a parameter, you need only
make
  // a single change.  Simply modify the value of the parameter string
below.
 
//--------------------------------------------------------------------------
  /**
   * @serial
   */
  private final String PARAM_styleURL = "styleURL";

  /**
   * @serial
   */
  private final String PARAM_documentURL = "documentURL";

  /**
   * @serial
   */
  private final String PARAM_parser = "parser";

  /**
   * @serial
   */
  private String whichParser = null;

  // We'll keep the DOM trees around, so tell which trees
  // are cached.
  /**
   * @serial
   */
  private String m_styleURLOfCached = null;

  /**
   * @serial
   */
  private String m_documentURLOfCached = null;

  /**
   * I save this for use on the worker thread, but i don't think I
   * need to do this.
   * @serial
   */
  private URL m_codeBase = null;
  private URL m_documentBase = null;

  private Document m_docTree = null;
  private Document m_styleTree = null;

  /**
   * The XSLTProcessorApplet constructor takes no arguments.
   */
  public myStartingXSLTProcessor()
  {
  	init();
  }

  public void init()
  {
    initLiaison();
  }

  /**
   * Try to init the XML liaison object: currently not implemented.
   */
  protected void initLiaison()
  {
    //String parserName = (whichParser.equals("ANY")) ?
Constants.LIAISON_CLASS : whichParser ;
    String parserName =  Constants.LIAISON_CLASS;
    try
    {
      Class parserLiaisonClass = Class.forName(parserName);

      Constructor parserLiaisonCtor =
parserLiaisonClass.getConstructor(null);
      m_liaison =
(XMLParserLiaison)parserLiaisonCtor.newInstance(null);
    }
    catch(Exception e)
    {
      e.printStackTrace();
       
//System.err.println(XSLMessages.createMessage(XSLTErrorResources.ER_COULD_NOT_CREATE_XML_PROC_LIAISON,
new Object[] {parserLiaisonClassName})); //"Could not create XML
Processor Liaison: "+parserLiaisonClassName);
        return;
    }
    try
    {
      m_processor = XSLTProcessorFactory.getProcessor();
      m_processor.setDiagnosticsOutput(System.out);

    }
    catch(org.xml.sax.SAXException se)
    {
      se.printStackTrace();
      throw new RuntimeException(se.getMessage());
    }

  }

  public String doTransform(String inputXML, String styleSheet)
  {
    StringWriter osw = new StringWriter();
	PrintWriter pw = new PrintWriter(osw, false);
    
	try
    {
		char[] xslbuf = styleSheet.toCharArray();
		CharArrayReader carStyle = new CharArrayReader(xslbuf);
		
		char[] xmlbuf = inputXML.toCharArray();
		CharArrayReader carInput = new CharArrayReader(xslbuf);

      {
      	XSLTInputSource xmlSource = new XSLTInputSource(carInput);
	Node xmlNode = m_processor.getSourceTreeFromInput(xmlSource);

      	XSLTInputSource xslSource = new XSLTInputSource(carStyle);
      	Node xslNode =  m_processor.getSourceTreeFromInput(xslSource);

      	// Node type should always be  Node.DOCUMENT_NODE (9)
      	if (xmlNode.getNodeType()== Node.DOCUMENT_NODE)
        	m_docTree = (Document)xmlNode;
      	else
        	System.out.println("XML source document node type is " +
xmlNode.getNodeType());
      	if (xslNode.getNodeType()== Node.DOCUMENT_NODE)
        	m_styleTree = (Document)xslNode;
      	else
        	System.out.println("Stylesheet source document node type is "
+ xslNode.getNodeType());

      	System.out.println("Stylesheet is: " + '"' + styleSheet + '"');
        StylesheetRoot stylesheet = null;
        
        stylesheet = m_processor.processStylesheet(xslSource);	
		
	if(null != stylesheet)
        {
          Node sourceTree =
m_processor.getSourceTreeFromInput(xmlSource);
          stylesheet.process(m_processor, sourceTree, new
XSLTResultTarget(pw));
        }
	
    }
    catch(Exception e)
    {
      //this.showStatus("Could not prime the pump!");
      System.out.println("Could not prime the pump!");
      e.printStackTrace();
    }
	
	return osw.toString();
  }


 
}
------------------------------------------------
I'm getting exactly the same exceptions as reported in my first
posting:

Input XSL; Line 1; Column 1
org.apache.xalan.xslt.XSLProcessorException: The root element is
required in a well-formed document.
        at
org.apache.xalan.xslt.XSLTEngineImpl.error(XSLTEngineImpl.java:1630)
        at
org.apache.xalan.xslt.XSLTEngineImpl.processStylesheet(XSLTEngineImpl
.java:722)
        at
myStartingXSLTProcessor.doTransform(myStartingXSLTProcessor.java:241)


Once again, I would greatly appreciate any help, advice, hints.
I'd love to hear from someone who has actually made Xalan accept its
input xml and stylesheet in strings.

Dimitre Novatchev.





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