transformtest.java

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/**
   @version 1.00 2001-09-29
   @author Cay Horstmann
*/

import java.io.*;
import java.util.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.stream.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

/**
   This program demonstrates XSL transformations. It applies
   a transformation to a set of employee records. The records
   are stored in the file employee.dat and turned into XML 
   format. Specify the stylesheet on the command line, e.g.
   java TransformTest makeprop.xsl
*/
public class TransformTest
{
   public static void main(String[] args) throws Exception
   {
      String filename;
      if (args.length > 0) filename = args[0];
      else filename = "makehtml.xsl";
      File styleSheet = new File(filename);
      StreamSource styleSource = new StreamSource(styleSheet); 

      Transformer t = TransformerFactory.newInstance().newTransformer(styleSource);
      t.transform(new SAXSource(new EmployeeReader(), 
         new InputSource(new FileInputStream("employee.dat"))), 
         new StreamResult(System.out));      
   }
}

/**
   This class reads the flat file employee.dat and reports SAX
   parser events to act as if it was parsing an XML file.
*/
class EmployeeReader implements XMLReader
{
   public void parse(InputSource source) 
      throws IOException, SAXException
   {
      InputStream stream = source.getByteStream();
      BufferedReader in = new BufferedReader(new InputStreamReader(stream));
      String rootElement = "staff";
      AttributesImpl atts = new AttributesImpl();

      if (handler == null) 
         throw new SAXException("No content handler");
        
      handler.startDocument();      
      handler.startElement("", rootElement, rootElement, atts);            
      String line;
      while ((line = in.readLine()) != null) 
      {
         handler.startElement("", "employee", "employee", atts);      
         StringTokenizer t = new StringTokenizer(line, "|");

         handler.startElement("", "name", "name", atts);      
         String s = t.nextToken();
         handler.characters(s.toCharArray(), 0, s.length());
         handler.endElement("", "name", "name");      

         handler.startElement("", "salary", "salary", atts);
         s = t.nextToken();
         handler.characters(s.toCharArray(), 0, s.length());
         handler.endElement("", "salary", "salary");

         atts.addAttribute("", "year", "year", "CDATA", t.nextToken());
         atts.addAttribute("", "month", "month", "CDATA", t.nextToken());
         atts.addAttribute("", "day", "day", "CDATA", t.nextToken());
         handler.startElement("", "hiredate", "hiredate", atts);
         handler.endElement("", "hiredate", "hiredate");
         atts.clear();

         handler.endElement("", "employee", "employee");
      }

      handler.endElement("", rootElement, rootElement);
      handler.endDocument();      
   }

   public void setContentHandler(ContentHandler newValue) {handler = newValue;} 
   public ContentHandler getContentHandler() { return handler; } 

   // the following methods are just do-nothing implementations
   public void parse(String systemId) throws IOException, SAXException {}
   public void setErrorHandler(ErrorHandler handler) {}
   public ErrorHandler getErrorHandler() { return null; }
   public void setDTDHandler(DTDHandler handler) {}
   public DTDHandler getDTDHandler() { return null; }
   public void setEntityResolver(EntityResolver resolver) {}
   public EntityResolver getEntityResolver() { return null; }
   public void setProperty(String name, Object value) {} 
   public Object getProperty(String name) { return null; }
   public void setFeature(String name, boolean value) {}
   public boolean getFeature(String name) { return false; }  

   private ContentHandler handler;
}