/**
* 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"));
}
}