/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package tdb.examples;
import static java.lang.System.out ;
import java.util.Iterator ;
import org.apache.jena.iri.IRIFactory ;
import com.hp.hpl.jena.graph.Graph ;
import com.hp.hpl.jena.query.* ;
import com.hp.hpl.jena.rdf.model.Model ;
import com.hp.hpl.jena.rdf.model.Property ;
import com.hp.hpl.jena.rdf.model.Resource ;
import com.hp.hpl.jena.rdf.model.Statement ;
import com.hp.hpl.jena.tdb.TDB ;
import com.hp.hpl.jena.tdb.TDBFactory ;
/** Example of single threaded use of TDB workign with the Jena RDF API */
public class ExTDB6
{
/// observe the non-http "protocol", because it is a bad precident
/// to only use http IRI when there is no http protocol involved
public static final String MY_NS =
"x-ns://example.org/ns1/";
public static void main(String[] args) throws Exception {
/// turn off the "No BGP optimizer warning"
TDB.setOptimizerWarningFlag(false);
final IRIFactory iriFactory = IRIFactory.semanticWebImplementation();
final String DATASET_DIR_NAME = "data0";
final Dataset data0 = TDBFactory.createDataset( DATASET_DIR_NAME );
// show the currently registered names
for (Iterator<String> it = data0.listNames(); it.hasNext(); ) {
out.println("NAME="+it.next());
}
out.println("getting named model...");
/// this is the OWL portion
final Model model = data0.getNamedModel( MY_NS );
out.println("Model := "+model);
out.println("getting graph...");
/// this is the DATA in that MODEL
final Graph graph = model.getGraph();
out.println("Graph := "+graph);
if (graph.isEmpty()) {
final Resource product1 = model.createResource(
iriFactory.construct( MY_NS +"product/1" )
.toString() );
final Property hasName = model.createProperty( MY_NS, "#hasName");
final Statement stmt = model.createStatement(
product1, hasName, model.createLiteral("Beach Ball","en") );
out.println("Statement = " + stmt);
model.add(stmt);
// just for fun
out.println("Triple := " + stmt.asTriple().toString());
} else {
out.println("Graph is not Empty; it has "+graph.size()+" Statements");
long t0, t1;
t0 = System.currentTimeMillis();
final Query q = QueryFactory.create(
"PREFIX exns: <"+MY_NS+"#>\n"+
"PREFIX exprod: <"+MY_NS+"product/>\n"+
" SELECT * "
// if you don't provide the Model to the
// QueryExecutionFactory below, then you'll need
// to specify the FROM;
// you *can* always specify it, if you want
// +" FROM <"+MY_NS+">\n"
// +" WHERE { ?node <"+MY_NS+"#hasName> ?name }"
// +" WHERE { ?node exns:hasName ?name }"
// +" WHERE { exprod:1 exns:hasName ?name }"
+" WHERE { ?res ?pred ?obj }"
);
out.println("Query := "+q);
t1 = System.currentTimeMillis();
out.println("QueryFactory.TIME="+(t1 - t0));
t0 = System.currentTimeMillis();
final QueryExecution qExec = QueryExecutionFactory
// if you query the whole DataSet,
// you have to provide a FROM in the SparQL
//.create(q, data0);
.create(q, model);
t1 = System.currentTimeMillis();
out.println("QueryExecutionFactory.TIME="+(t1 - t0));
try {
t0 = System.currentTimeMillis();
ResultSet rs = qExec.execSelect();
t1 = System.currentTimeMillis();
out.println("executeSelect.TIME="+(t1 - t0));
while (rs.hasNext()) {
QuerySolution sol = rs.next();
out.println("Solution := "+sol);
for (Iterator<String> names = sol.varNames(); names.hasNext(); ) {
final String name = names.next();
out.println("\t"+name+" := "+sol.get(name));
}
}
} finally {
qExec.close();
}
}
out.println("closing graph");
graph.close();
out.println("closing model");
model.close();
//out.println("closing DataSetGraph");
//dsg.close();
out.println("closing DataSet");
data0.close();
}
}