RE: SAX Transformation: Servlet returns blank XSL temp

Your SAX filter is using lots of updateable static variables. This means
it isn't thread-safe. In fact, it probably isn't even serially
re-usable: I don't think drvrCount is ever decremented.

Sorry, but I haven't the time, nor is this the right place, to teach you
about writing servlets.

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx 

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx 
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Bruce McDougald
> Sent: 09 October 2002 22:30
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  SAX Transformation: Servlet returns blank 
> XSL template
> 
> 
> > There's a bug in your servlet code, but without seeing the code, I 
> > can't begin to guess what it is.
> >
> 
> Sorry, here is my code.
> ------------------------------------
> 
> public class pipeline extends HttpServlet{
> 
>     public void doGet (HttpServletRequest req, 
> HttpServletResponse res)
>                      throws ServletException,IOException
>     {
>     // Set content type for HTML.
>      res.setContentType("text/html; charset=UTF-8");
> 
>      OutputStream os = res.getOutputStream();
> 
>   try{
> 
>     TransformerFactory tFactory = TransformerFactory.newInstance();
> 
>     if (tFactory.getFeature(SAXSource.FEATURE) &&
> tFactory.getFeature(SAXResult.FEATURE))
>     {
> 
>       XMLReader reader = XMLReaderFactory.createXMLReader();
> 
>       SAXTransformerFactory saxTFactory = 
> ((SAXTransformerFactory) tFactory);
> 
>       XMLFilter xmlFilter1 = new SAXParse();
> 
>       xmlFilter1.setParent(reader);
> 
>       XMLFilter xmlFilter2 =
>                saxTFactory.newXMLFilter(new 
> StreamSource("http://localhost/taymac.nsf/dynitmact.xsl"));
> 
>       // xmlFilter1 uses the XMLReader as its reader.
>       xmlFilter2.setParent(xmlFilter1);
> 
>       // xmlFilter2 outputs SAX events to the serializer.
>       Serializer serializer = SerializerFactory.getSerializer
> 
> (OutputProperties.getDefaultMethodProperties("xml"));
> 
>       serializer.setOutputStream(os);
> 
>       xmlFilter2.setContentHandler(serializer.asContentHandler());
>       xmlFilter2.parse(new 
> InputSource("http://localhost/cgi-bin/xmlbldr.pl"));
> 
>       os.flush();
>       os.close();
>     }
> 
>   }catch (Exception e){
>     e.printStackTrace();
>   }
>  }
> }
> 
> //////////////////////////////////////////////////////////////
> 
> public class SAXParse extends XMLFilterImpl
> {
> 
>     String col;
>     String row;
>     String drvr;
>     String root;
>     String node;
> 
>     static boolean  rootFlag = false;
>     static boolean  drvrFlag = false;
>     static boolean  colFlag = false;
>     static boolean  rowFlag = false;
> 
>     static int drvrCount = 0;
>     static int colCount = 0;
>     static int rowCount = 0;
> 
>     static int colStart = 85;
>     static int rowStart = 0;
> 
>     static int colLimit = 13;
>     static int rowLimit = 25;
>     static int drvrLimit = 3;
> 
> 
>     
> ////////////////////////////////////////////////////////////////////
>     // Event handlers.
>     
> ////////////////////////////////////////////////////////////////////
> 
>     public void startElement (String uri, String name,
>          String qName, Attributes atts)
>                               throws SAXException
>     {
>        boolean printIt = false;
>         node = qName;
> 
>         if ( qName.equals( "ITMACT" ) ) {
>              rootFlag = true;
>              rowFlag = false;
>              colFlag = false;
>              drvrFlag = false;
>              root = qName;
>              printIt = true;
>        }
> 
>         if ( qName.equals( "DRIVER" ) ) {
>              drvrCount++;
>              rowCount=0;
>              rowFlag = false;
>              colFlag = false;
>              if (drvrCount == drvrLimit){
>                 drvrFlag = true;
>                 drvr = qName;
>                 printIt = true;
>              }else{
>                  drvrFlag = false;
>              }
>         }
> 
>         if ( drvrFlag && qName.equals("DRVRKEY") )  {
>               printIt = true;
>        }
> 
>         if (qName.equals("ROW") && drvrFlag){
>            rowCount++;
>            colCount = 0;
>            colFlag = false;
>            if ((rowCount >= rowStart) &&
>                (rowCount <= rowStart + rowLimit)){
>                 rowFlag = true;
>                 row = qName;
>                 printIt = true;
>              }else{
>                rowFlag = false;
>              }
> 
>         }
> 
>         if ( qName.equals("ROWKEY") && rowFlag ) {
>                 printIt = true;
>           }
> 
>         if (qName.equals("COLUMN") && rowFlag){
>            colCount++;
>            if ((colCount >= colStart) &&
>                (colCount <= colStart + colLimit)){
>                 colFlag = true;
>                 col = qName;
>                 printIt = true;
>            }else{
>                colFlag = false;
>            }
>         }
> 
>         if (( (qName.equals("COLKEY")) ||
>               (qName.equals("CDATA1")) ||
>               (qName.equals("CDATA2")) ||
>               (qName.equals("CDATA3")) ) && colFlag ) {
>               printIt = true;
>         }
> 
>         if (printIt){
>           super.startElement(uri,name,qName,atts);
>           printIt = false;
>         }
> 
>     }
> 
> 
>     public void endElement (String uri, String name, String qName)
>        throws SAXException
>     {
> 
>        boolean printIt = false;
> 
>        if ( qName.equals("ITMACT") ) {
>               printIt = true;
>        }
> 
>        if ( drvrFlag && ( (qName.equals("DRIVER"))||
> (qName.equals("DRVRKEY")) )) {
>            printIt = true;
>        }
> 
>         if ( ((qName.equals("ROW")) || 
> (qName.equals("ROWKEY"))) && rowFlag ) {
>               printIt = true;
>           }
> 
>         if (( (qName.equals("COLUMN")) ||
>               (qName.equals("COLKEY")) ||
>               (qName.equals("CDATA1")) ||
>               (qName.equals("CDATA2")) ||
>               (qName.equals("CDATA3"))) && colFlag ) {
>               printIt = true;
>        }
> 
>         if (printIt){
>           super.endElement(uri,name,qName);
>           printIt = false;
>         }
> 
>     }
> 
> 
>     public void characters (char[] ch, int start, int length)
>     throws SAXException
>     {
>         boolean wFlag = false;
> 
>         if(drvrFlag && ( node.equals("DRIVER") || 
> node.equals("DRVRKEY"))) { wFlag = true;};
> 
>         if(rowFlag && ( node.equals("ROW") || 
> node.equals("ROWKEY"))) {wFlag = true;};
> 
>         if(colFlag){ wFlag=true; }
> 
> 
>         if(wFlag) { super.characters (ch, start, length); }
>   }
>   }
> 
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
> 


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