public Configuration buildFromItem(Item item) throws SAXException {
SAXConfigurationHandler handler = getHandler();
handler.clear();
item.toSAX(broker, handler, new Properties());
return handler.getConfiguration();
}
/*
* Actual implementation of the rendering process. When a function in this
* module is called, this method is executed with the given inputs. @param
* Sequence[] args (XSL-FO, mime-type, parameters) @param Sequence
* contextSequence (default sequence)
*
* @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[],
* org.exist.xquery.value.Sequence)
*/
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
// gather input XSL-FO document
// if no input document (empty), return empty result as we need data to
// process
if (args[0].isEmpty()) return Sequence.EMPTY_SEQUENCE;
Item inputNode = args[0].itemAt(0);
// get mime-type
String mimeType = args[1].getStringValue();
// get parameters
Properties parameters = new Properties();
if (!args[2].isEmpty()) {
parameters = ModuleUtils.parseParameters(((NodeValue) args[2].itemAt(0)).getNode());
}
try {
// setup a transformer handler
TransformerHandler handler =
TransformerFactoryAllocator.getTransformerFactory(context.getBroker())
.newTransformerHandler();
Transformer transformer = handler.getTransformer();
// set the parameters if any
if (parameters.size() > 0) {
Enumeration keys = parameters.keys();
while (keys.hasMoreElements()) {
String name = (String) keys.nextElement();
String value = parameters.getProperty(name);
transformer.setParameter(name, value);
}
}
// setup the FopFactory
FopFactory fopFactory = FopFactory.newInstance();
if (args.length == 4 && args[3] != null && !args[3].isEmpty()) {
FopConfigurationBuilder cfgBuilder = new FopConfigurationBuilder(context.getBroker());
Configuration cfg = cfgBuilder.buildFromItem(args[3].itemAt(0));
fopFactory.setUserConfig(cfg);
}
// setup the foUserAgent, using given parameters held in the
// transformer handler
FOUserAgent foUserAgent =
setupFOUserAgent(fopFactory.newFOUserAgent(), parameters, transformer);
// create new instance of FOP using the mimetype, the created user
// agent, and the output stream
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Fop fop = fopFactory.newFop(mimeType, foUserAgent, baos);
// Obtain FOP's DefaultHandler
DefaultHandler dh = fop.getDefaultHandler();
// process the XSL-FO
dh.startDocument();
inputNode.toSAX(context.getBroker(), dh, new Properties());
dh.endDocument();
// return the result
return new Base64Binary(baos.toByteArray());
} catch (TransformerException te) {
throw new XPathException(te);
} catch (SAXException se) {
throw new XPathException(se);
}
}
