edu.stanford.smi.protegex.owl.jena.triplestore
Class JenaMemoryTripleWriter

java.lang.Object
  edu.stanford.smi.protegex.owl.jena.triplestore.JenaMemoryTripleWriter

All Implemented Interfaces:

TripleWriter

public class JenaMemoryTripleWriter

extends Object

implements TripleWriter

A TripleWriter that writes into a given OntModel, which is then written to a file when done. This TripleWriter keeps the whole model in memory, i.e. it is mandatory to make sure that the model does not become too big. However, the advantage is that this can be used to write triples and prefixes in an arbitrary order.

Author:

Holger Knublauch

Field Summary

private com.hp.hpl.jena.graph.Node	defaultOntologyNode
private com.hp.hpl.jena.ontology.OntModel	ontModel
private OutputStream	os

Constructor Summary

JenaMemoryTripleWriter()
Creates a JenaMemoryTripleWriter for in-memory use only.

JenaMemoryTripleWriter(OutputStream os)

JenaMemoryTripleWriter(OutputStream os, com.hp.hpl.jena.ontology.OntModel ontModel)

Method Summary

void	addImport(String uri) Adds an owl:imports statement to the default ontology in this writer.
void	addTriple(com.hp.hpl.jena.graph.Node subject, com.hp.hpl.jena.graph.Node predicate, com.hp.hpl.jena.graph.Node object)
void	close() Tells the writer that we're finished.
private com.hp.hpl.jena.graph.Node	createNodeFromRDFResource(RDFResource resource)
private com.hp.hpl.jena.graph.Node	createNodeFromRDFSLiteral(RDFSLiteral literal, OWLModel owlModel)
com.hp.hpl.jena.ontology.OntModel	getOntModel()
void	init(String baseURI) Initializes this writer to work with a given base URI.
void	write(RDFResource tsubject, RDFProperty tpredicate, Object tobject) Writes a given Triples into this writer.
void	writePrefix(String prefix, String namespace) Writes a prefix declaration into this writer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

defaultOntologyNode

private com.hp.hpl.jena.graph.Node defaultOntologyNode

ontModel

private com.hp.hpl.jena.ontology.OntModel ontModel

os

private OutputStream os

Constructor Detail

JenaMemoryTripleWriter

public JenaMemoryTripleWriter()

Creates a JenaMemoryTripleWriter for in-memory use only. The method close shall not be called on this. This constructor is useful for testing purposes, to test the output into a writer without having to generate a File.

JenaMemoryTripleWriter

public JenaMemoryTripleWriter(OutputStream os)

JenaMemoryTripleWriter

public JenaMemoryTripleWriter(OutputStream os,
                              com.hp.hpl.jena.ontology.OntModel ontModel)

Method Detail

addImport

public void addImport(String uri)

Description copied from interface: TripleWriter

Adds an owl:imports statement to the default ontology in this writer. This is a convenience method because the same can typically be achieved by adding a corresponding triple.

Specified by:

addImport in interface TripleWriter

Parameters:

uri - the URI to add

addTriple

public void addTriple(com.hp.hpl.jena.graph.Node subject,
                      com.hp.hpl.jena.graph.Node predicate,
                      com.hp.hpl.jena.graph.Node object)

close

public void close()
           throws Exception

Description copied from interface: TripleWriter

Tells the writer that we're finished. This method should be called at the end of a writing process. After this method has been called, no other calls to this object are permitted.

Specified by:

close in interface TripleWriter

Throws:

Exception

createNodeFromRDFResource

private com.hp.hpl.jena.graph.Node createNodeFromRDFResource(RDFResource resource)

createNodeFromRDFSLiteral

private com.hp.hpl.jena.graph.Node createNodeFromRDFSLiteral(RDFSLiteral literal,
                                                             OWLModel owlModel)

getOntModel

public com.hp.hpl.jena.ontology.OntModel getOntModel()

init

public void init(String baseURI)

Description copied from interface: TripleWriter

Initializes this writer to work with a given base URI. This URI will also be the URI of the default ontology in this file, and future calls of addImport will add to this ontology.

Specified by:

init in interface TripleWriter

Parameters:

baseURI - the base URI, such as http://www.a.com/ontology.owl

write

public void write(RDFResource tsubject,
                  RDFProperty tpredicate,
                  Object tobject)

Description copied from interface: TripleWriter

Writes a given Triples into this writer.

Specified by:

write in interface TripleWriter

writePrefix

public void writePrefix(String prefix,
                        String namespace)

Description copied from interface: TripleWriter

Writes a prefix declaration into this writer. Since namespace declarations are typically written to the beginning of a file, implementations of this method may require that any calls to this method are done before the first triple is written out.

Specified by:

writePrefix in interface TripleWriter

Parameters:

prefix - the prefix to define ("" for the default namespace)

namespace - the namespace to assign to the prefix