[JENA-735] Cannot write using TURTLE_FLAT: com.hp.hpl.jena.shared.NoWriterForLangException: TURTLE_FLAT

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Jena 2.11.2
• Fix Version/s: Jena 2.12.0
• Component/s: Web site
• Assignee: Andy Seaborne
• Reporter: Hendy Irawan
• Created: 02/Jul/14 09:52
• Updated: 02/Jul/14 21:31
• Resolved: 02/Jul/14 21:31

Description

https://jena.apache.org/documentation/io/rdf-output.html mentioned:

This page describes the RIOT (RDF I/O technology) output capabilities introduced in Jena 2.10.1. ... There are two ways to write RDF data using Apache Jena RIOT, either via the RDFDataMgr ... or using the model API:

model.write(output, "format") ;

It should be mentioned in the documentation that using the model API has limited supported formats, and Jena users should use RDFDataMgr because it's typesafe and it supports all formats.

The Model API (I'm using DefaultModel) method throws exception for TURTLE_FLAT (it works for TURTLE):

05:14:19.797 [main] DEBUG o.a.j.riot.stream.JenaIOEnvironment - Failed to find configuration: location-mapping.ttl;location-mapping.rdf;location-mapping.n3;etc/location-mapping.rdf;etc/location-mapping.n3;etc/location-mapping.ttl
05:14:19.851 [main] INFO  c.hendyirawan.wordnet.Wn30CoreToWn31 - Loading WordNet 3.0 core file '/media/ceefour/passport/Tech/Intelligent_Systems/WordNet3/wn30-core-synsets.tab'...
05:14:19.993 [main] INFO  c.hendyirawan.wordnet.Wn30CoreToWn31 - Converted to 9920 RDF statements
05:14:19.993 [main] INFO  c.hendyirawan.wordnet.Wn30CoreToWn31 - Saving TURTLE to '/home/ceefour/git/wordnet-extras/wn31-core-synsets.ttl'...
Exception in thread "main" com.hp.hpl.jena.shared.NoWriterForLangException: TURTLE_FLAT
	at com.hp.hpl.jena.rdf.model.impl.RDFWriterFImpl.getWriter(RDFWriterFImpl.java:125)
	at com.hp.hpl.jena.rdf.model.impl.ModelCom.getWriter(ModelCom.java:305)
	at com.hp.hpl.jena.rdf.model.impl.ModelCom.write(ModelCom.java:354)
	at com.hendyirawan.wordnet.Wn30CoreToWn31.main(Wn30CoreToWn31.java:96)

Code:

Model model = ModelFactory.createDefaultModel();
model.setNsPrefix("wn31", "http://wordnet-rdf.princeton.edu/wn31/");
model.setNsPrefix("wordnet-ontology", "http://wordnet-rdf.princeton.edu/ontology#");
model.setNsPrefix("olo", "http://purl.org/ontology/olo/core#");
Resource synsetRes = model.createResource(model.getNsPrefixURI("wordnet-ontology") + "Synset");
Property indexProp = model.createProperty(model.getNsPrefixURI("olo"), "index");

File wn30coreFile = new File(args[0]);
log.info("Loading WordNet 3.0 core file '{}'...", wn30coreFile);
try (CSVReader reader = new CSVReader(new FileReader(wn30coreFile), '\t')) {
	int index = 1;
	while (true) {
		String[] row = reader.readNext();
		if (row == null) {
			break;
		}
		String wn30sense = row[0];
		char posLetter = wn30sense.charAt(9);
		final Integer posNumeric = Preconditions.checkNotNull(POS_NUMERIC.get(posLetter),
				"Invalid part-of-speech letter code '%s' for sense '%s'", posLetter, wn30sense);
		String wn31sense = posNumeric + wn30sense;
		final Resource wn31res = model.createResource(model.getNsPrefixURI("wn31") + wn31sense);
		model.add(wn31res, RDF.type, synsetRes);
		model.addLiteral(wn31res, indexProp, index); // hacky usage, but pragmatic :P
		index++;
	}
}

log.info("Converted to {} RDF statements", Iterators.size(model.listStatements()));
File wn31TurtleFile = new File(args[1], "wn31-core-synsets.ttl");
log.info("Saving TURTLE to '{}'...", wn31TurtleFile);
model.write(new FileOutputStream(wn31TurtleFile), "TURTLE_FLAT");