/**
* Returns a transformer for the given XSLT file. If one already exists, it will be returned and
* no new one will be created.
*
* @param xsltFileName the name of the XSLT file to use
* @return The transformer that uses the given XSLT file or null, if none could be created.
*/
private static Transformer getTransformer(String xsltFileName) {
String key = xsltFileName + "-" + Thread.currentThread().getId();
if (transformers.containsKey(key)) {
return transformers.get(key);
}
InputStream xsltFile = XsltRunner.class.getResourceAsStream("/" + xsltFileName);
if (xsltFile == null) {
Log.error(TAG, "Error could not find: " + xsltFileName);
return null;
}
try {
Source xsltSource = new StreamSource(xsltFile);
TransformerFactory transFactory = TransformerFactory.newInstance();
// Add a URI resolver so that the XSL docs may import other XSL docs
// using relative paths
transFactory.setURIResolver(
new URIResolver() {
public Source resolve(String href, String base) throws TransformerException {
InputStream is = XsltRunner.class.getResourceAsStream("/" + href);
return new StreamSource(is);
}
});
Transformer transformer = transFactory.newTransformer(xsltSource);
transformers.put(key, transformer);
return transformer;
} catch (TransformerConfigurationException e) {
Log.error(TAG, "Could not create transformer for " + xsltFileName + ": " + e.getMessage());
}
return null;
}
/**
* Runs an XSLT file on the given JDOM document.
*
* @param xsltFileName The name of the file that contains the XSLT definition.
* @param doc The JDOM document the XSL transformation should be applied to. The first index
* refers to the i-th parameter, the index will be 0 for the parameter name and 1 for the
* parameter value. See {@link Transformer#setParameter(String, Object)}
* @param xsltParams Parameters that should be applied to the transformation.
* @return The output file with the result of the transformation.
*/
public static OutputFile runXSLT(String xsltFileName, Document doc, String[][] xsltParams) {
StringWriter writer = new StringWriter();
try {
Transformer transformer = getTransformer(xsltFileName);
transformer.reset();
if (xsltParams != null) {
for (int i = 0; i < xsltParams.length; i++)
transformer.setParameter(xsltParams[i][0], xsltParams[i][1]);
}
DocumentWrapper docw =
new DocumentWrapper(doc, "", ((Controller) transformer).getConfiguration());
Result result = new StreamResult(writer);
transformer.transform(docw, result);
return new OutputFile(writer.toString());
} catch (TransformerException e) {
Log.error(TAG, e.getMessage());
}
return null;
}