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import javax.xml.transform.*;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.Attribute;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import com.icl.saxon.Context;
import com.icl.saxon.jdom.DocumentWrapper;
import com.icl.saxon.jdom.NodeWrapper;
import com.icl.saxon.expr.Expression;
import com.icl.saxon.expr.StandaloneContext;
import com.icl.saxon.om.NodeEnumeration;
import com.icl.saxon.om.NamePool;
// Needed java classes
import java.io.File;
import java.util.Properties;
/**
* 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 {
/**
* Method main
*/
public static void main(String argv[])
throws TransformerException, TransformerConfigurationException,
JDOMException {
if (argv.length != 2) {
System.err.println("Usage: JDOMExample source.xml style.xsl >out.xml");
} else {
transform(argv[0], argv[1]);
}
}
/**
* Show the simplest possible transformation from system id
* to output stream.
*/
public static void transform(String sourceID, String xslID)
throws TransformerException, TransformerConfigurationException,
JDOMException {
// Build the JDOM document
SAXBuilder builder = new SAXBuilder("com.icl.saxon.aelfred.SAXDriver");
Document doc = builder.build(new File(sourceID));
// Give it a Saxon wrapper
DocumentWrapper docw = new DocumentWrapper(doc, sourceID);
NamePool pool = NamePool.getDefaultNamePool();
docw.setNamePool(pool);
// Retrieve all the ITEM elements
Expression exp = Expression.make("//ITEM", new StandaloneContext(pool));
Context context = new Context();
context.setContextNode(docw);
context.setPosition(1);
context.setLast(1);
NodeEnumeration enum = exp.enumerate(context, false);
// For each of these, compute an additional attribute
while (enum.hasMoreElements()) {
NodeWrapper node = (NodeWrapper)enum.nextElement();
Element item = (Element)node.getNode();
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", "?");
}
}
// Now do a transformation
System.setProperty("javax.xml.transform.TransformerFactory",
"com.icl.saxon.TransformerFactoryImpl");
TransformerFactory tfactory = TransformerFactory.newInstance();
Templates templates = tfactory.newTemplates(new StreamSource(xslID));
Transformer transformer = templates.newTransformer();
transformer.transform(docw, new StreamResult(System.out));
}
}
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