private static Data copyDerefData(Data dereferencedData) {
if (dereferencedData instanceof ApacheData) {
// need to make a copy of the Data
ApacheData ad = (ApacheData) dereferencedData;
XMLSignatureInput xsi = ad.getXMLSignatureInput();
if (xsi.isNodeSet()) {
try {
final Set s = xsi.getNodeSet();
return new NodeSetData() {
public Iterator iterator() {
return s.iterator();
}
};
} catch (Exception e) {
// log a warning
log.log(Level.WARNING, "cannot cache dereferenced data: " + e);
return null;
}
} else if (xsi.isElement()) {
return new DOMSubTreeData(xsi.getSubNode(), xsi.isExcludeComments());
} else if (xsi.isOctetStream() || xsi.isByteArray()) {
try {
return new OctetStreamData(xsi.getOctetStream(), xsi.getSourceURI(), xsi.getMIMEType());
} catch (IOException ioe) {
// log a warning
log.log(Level.WARNING, "cannot cache dereferenced data: " + ioe);
return null;
}
}
}
return dereferencedData;
}
private static Element obtainRefrenceElement(XMLSignatureInput resource)
throws CanonicalizationException, ParserConfigurationException, IOException, SAXException,
KeyResolverException {
Element e;
if (resource.isElement()) {
e = (Element) resource.getSubNode();
} else if (resource.isNodeSet()) {
// Retrieved resource is a nodeSet
e = getDocumentElement(resource.getNodeSet());
} else {
// Retrieved resource is an inputStream
byte inputBytes[] = resource.getBytes();
e = getDocFromBytes(inputBytes);
// otherwise, we parse the resource, create an Element and delegate
if (log.isLoggable(java.util.logging.Level.FINE))
log.log(java.util.logging.Level.FINE, "we have to parse " + inputBytes.length + " bytes");
}
return e;
}