if (!writingStarted) {
throw new RuntimeException("Document writing has not yet been started");
}
Resource subj = st.getSubject();
URI pred = st.getPredicate();
Value obj = st.getObject();
// Verify that an XML namespace-qualified name can be created for the
// predicate
String predString = pred.toString();
int predSplitIdx = XMLUtil.findURISplitIndex(predString);
if (predSplitIdx == -1) {
throw new RDFHandlerException("Unable to create XML namespace-qualified name for predicate: "
+ predString);
}
String predNamespace = predString.substring(0, predSplitIdx);
String predLocalName = predString.substring(predSplitIdx);
try {
if (!headerWritten) {
writeHeader();
}
// SUBJECT
if (!subj.equals(lastWrittenSubject)) {
flushPendingStatements();
// Write new subject:
writeNewLine();
writeStartOfStartTag(RDF.NAMESPACE, "Description");
if (subj instanceof BNode) {
BNode bNode = (BNode)subj;
writeAttribute(RDF.NAMESPACE, "nodeID", bNode.getID());
}
else {
URI uri = (URI)subj;
writeAttribute(RDF.NAMESPACE, "about", uri.toString());
}
writeEndOfStartTag();
writeNewLine();
lastWrittenSubject = subj;
}
// PREDICATE
writeIndent();
writeStartOfStartTag(predNamespace, predLocalName);
// OBJECT
if (obj instanceof Resource) {
Resource objRes = (Resource)obj;
if (objRes instanceof BNode) {
BNode bNode = (BNode)objRes;
writeAttribute(RDF.NAMESPACE, "nodeID", bNode.getID());
}
else {
URI uri = (URI)objRes;
writeAttribute(RDF.NAMESPACE, "resource", uri.toString());
}
writeEndOfEmptyTag();
}
else if (obj instanceof Literal) {
Literal objLit = (Literal)obj;
// language attribute
if (objLit.getLanguage() != null) {
writeAttribute("xml:lang", objLit.getLanguage());
}
// datatype attribute
boolean isXMLLiteral = false;
URI datatype = objLit.getDatatype();
if (datatype != null) {
// Check if datatype is rdf:XMLLiteral
isXMLLiteral = datatype.equals(RDF.XMLLITERAL);
if (isXMLLiteral) {
writeAttribute(RDF.NAMESPACE, "parseType", "Literal");
}
else {
writeAttribute(RDF.NAMESPACE, "datatype", datatype.toString());
}
}
writeEndOfStartTag();