Esempio n. 1
1
  /**
   * Uses a Vector of TransformerHandlers to pipe XML input document through a series of 1 or more
   * transformations. Called by {@link #pipeDocument}.
   *
   * @param vTHandler Vector of Transformation Handlers (1 per stylesheet).
   * @param source absolute URI to XML input
   * @param target absolute path to transformation output.
   */
  public void usePipe(Vector vTHandler, String source, String target)
      throws TransformerException, TransformerConfigurationException, FileNotFoundException,
          IOException, SAXException, SAXNotRecognizedException {
    XMLReader reader = XMLReaderFactory.createXMLReader();
    TransformerHandler tHFirst = (TransformerHandler) vTHandler.firstElement();
    reader.setContentHandler(tHFirst);
    reader.setProperty("http://xml.org/sax/properties/lexical-handler", tHFirst);
    for (int i = 1; i < vTHandler.size(); i++) {
      TransformerHandler tHFrom = (TransformerHandler) vTHandler.elementAt(i - 1);
      TransformerHandler tHTo = (TransformerHandler) vTHandler.elementAt(i);
      tHFrom.setResult(new SAXResult(tHTo));
    }
    TransformerHandler tHLast = (TransformerHandler) vTHandler.lastElement();
    Transformer trans = tHLast.getTransformer();
    Properties outputProps = trans.getOutputProperties();
    Serializer serializer = SerializerFactory.getSerializer(outputProps);

    FileOutputStream out = new FileOutputStream(target);
    try {
      serializer.setOutputStream(out);
      tHLast.setResult(new SAXResult(serializer.asContentHandler()));
      reader.parse(source);
    } finally {
      // Always clean up the FileOutputStream,
      // even if an exception was thrown in the try block
      if (out != null) out.close();
    }
  }
  public static void main(String[] args)
      throws TransformerException, TransformerConfigurationException, SAXException, IOException {
    // Instantiate  a TransformerFactory.
    TransformerFactory tFactory = TransformerFactory.newInstance();
    // Determine whether the TransformerFactory supports The use uf SAXSource
    // and SAXResult
    if (tFactory.getFeature(SAXSource.FEATURE) && tFactory.getFeature(SAXResult.FEATURE)) {
      // Cast the TransformerFactory to SAXTransformerFactory.
      SAXTransformerFactory saxTFactory = ((SAXTransformerFactory) tFactory);
      // Create an XMLFilter for each stylesheet.
      XMLFilter xmlFilter1 = saxTFactory.newXMLFilter(new StreamSource("foo1.xsl"));
      XMLFilter xmlFilter2 = saxTFactory.newXMLFilter(new StreamSource("foo2.xsl"));
      XMLFilter xmlFilter3 = saxTFactory.newXMLFilter(new StreamSource("foo3.xsl"));

      // Create an XMLReader.
      XMLReader reader = XMLReaderFactory.createXMLReader();

      // xmlFilter1 uses the XMLReader as its reader.
      xmlFilter1.setParent(reader);

      // xmlFilter2 uses xmlFilter1 as its reader.
      xmlFilter2.setParent(xmlFilter1);

      // xmlFilter3 uses xmlFilter2 as its reader.
      xmlFilter3.setParent(xmlFilter2);

      // xmlFilter3 outputs SAX events to the serializer.
      java.util.Properties xmlProps = OutputPropertiesFactory.getDefaultMethodProperties("xml");
      xmlProps.setProperty("indent", "yes");
      xmlProps.setProperty("standalone", "no");
      Serializer serializer = SerializerFactory.getSerializer(xmlProps);
      serializer.setOutputStream(System.out);
      xmlFilter3.setContentHandler(serializer.asContentHandler());

      // Perform the series of transformations as follows:
      //   - transformer3 gets its parent (transformer2) as the XMLReader/XMLFilter
      //     and calls transformer2.parse(new InputSource("foo.xml")).
      //   - transformer2 gets its parent (transformer1) as the XMLReader/XMLFilter
      //     and calls transformer1.parse(new InputSource("foo.xml")).
      //   - transformer1 gets its parent (reader, a SAXParser) as the XMLReader
      //     and calls reader.parse(new InputSource("foo.xml")).
      //   - reader parses the XML document and sends the SAX parse events to transformer1,
      //     which performs transformation 1 and sends the output to transformer2.
      //   - transformer2 parses the transformation 1 output, performs transformation 2, and
      //     sends the output to transformer3.
      //   - transformer3 parses the transformation 2 output, performs transformation 3,
      //     and sends the output to the serializer.
      xmlFilter3.parse(new InputSource("foo.xml"));
    }
  }