import com.saxonica.config.ProfessionalConfiguration;
import net.sf.saxon.option.jdom.DocumentWrapper;
import net.sf.saxon.TransformerFactoryImpl;
import net.sf.saxon.xpath.XPathEvaluator;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
/**
* A simple example to show how SAXON can be used with a JDOM tree.
* It is designed to be used with the source document books.xml and the
* stylesheet total.xsl
* @author Michael H. Kay
*/
public class JDOMExample {
private JDOMExample() {}
/**
* Method main
*/
public static void main(String argv[])
throws TransformerException, XPathExpressionException,
JDOMException, IOException {
if (argv.length == 2) {
transform(argv[0], argv[1]);
} else {
System.err.println("Usage: JDOMExample source.xml style.xsl >out.xml");
}
}
/**
* Show (a) use of freestanding XPath expressions against the JDOM document, and
* (b) the simplest possible transformation from system id to output stream.
*/
public static void transform(String sourceID, String xslID)
throws TransformerException, XPathExpressionException, JDOMException, IOException {
// Get a TransformerFactory
System.setProperty("javax.xml.transform.TransformerFactory",
"com.saxonica.config.ProfessionalTransformerFactory");
TransformerFactory tfactory = TransformerFactory.newInstance();
ProfessionalConfiguration config = (ProfessionalConfiguration)((TransformerFactoryImpl)tfactory).getConfiguration();
// Build the JDOM document
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(new File(sourceID));
// Give it a Saxon wrapper
DocumentWrapper docw =
new DocumentWrapper(doc, sourceID, config);
// Retrieve all the ITEM elements
XPathEvaluator xpath = new XPathEvaluator(config);
XPathExpression exp = xpath.compile("//ITEM");
List list = (List)exp.evaluate(docw, XPathConstants.NODESET);
// For each of these, compute an additional attribute
for (Iterator iter=list.iterator(); iter.hasNext();) {
Element item = (Element)iter.next();
String price = item.getChildText("PRICE");
String quantity = item.getChildText("QUANTITY");
try {
double priceval = Double.parseDouble(price);
double quantityval = Double.parseDouble(quantity);
double value = priceval * quantityval;
item.setAttribute("VALUE", ""+value);
} catch (NumberFormatException err) {
item.setAttribute("VALUE", "?");
}
}
// Un-comment the following lines to get trace output from the transformation
// tfactory.setAttribute(net.sf.saxon.lib.FeatureKeys.TRACE_LISTENER,
// new net.sf.saxon.trace.XSLTTraceListener());
// Compile the stylesheet
Templates templates = tfactory.newTemplates(new StreamSource(xslID));
Transformer transformer = templates.newTransformer();
// Now do a transformation
transformer.transform(docw, new StreamResult(System.out));
}
/**
* Here is an extension function you can try calling from the XSLT stylesheet
*/
public static int elementContentSize(Element element) {
return element.getContentSize();
}
}