| content
| - %VOSWARNING%
%META:TOPICPARENT{name="VirtJenaProvider"}%
---+ Virtuoso Jena Provider - SPARQL Example 14
<verbatim>
import org.apache.jena.query.*;
import org.apache.jena.ontology.*;
import org.apache.jena.rdf.model.*;
import org.apache.jena.reasoner.ReasonerRegistry;
import org.apache.jena.util.PrintUtil;
import org.apache.jena.vocabulary.RDFS;
/**
import org.apache.jena.query.*;
import org.apache.jena.graph.Triple;
import org.apache.jena.graph.Node;
import org.apache.jena.graph.Graph;
import org.apache.jena.graph.*;
import org.apache.jena.rdf.model.*;
import org.apache.jena.rdf.model.RDFNode;
import org.apache.jena.vocabulary.RDFS;
**/
import virtuoso.jena.driver.*;
public class VirtuosoSPARQLExample14 {
static String URL = "jdbc:virtuoso://localhost:1111";
static final String uid = "dba";
static final String pwd = "dba";
public static void print_model(String header, Model m) {
String h = header==null?"Model":header;
System.out.println("===========["+h+"]==========");
StmtIterator it = m.listStatements((Resource)null, (Property)null, (RDFNode)null);
while(it.hasNext()) {
Statement st = it.nextStatement();
System.out.println(st);
}
System.out.println("============================\n");
}
public static void print_model(String header, StmtIterator it) {
String h = header==null?"Model iterator":header;
System.out.println("===========["+h+"]==========");
while(it.hasNext()) {
Statement st = it.nextStatement();
System.out.println(st);
}
System.out.println("============================\n");
}
public static void exec_select(String header, Model m, String query) {
String h = header==null?"":header;
System.out.println("===========["+h+"]==========");
System.out.println("Exec: "+ query);
Query jquery = QueryFactory.create(query) ;
QueryExecution qexec = QueryExecutionFactory.create(jquery, m) ;
ResultSet results = qexec.execSelect();
ResultSetFormatter.out(System.out, results, jquery);
qexec.close();
System.out.println("============================\n");
}
public static void main(String[] args) {
if (args.length != 0)
URL = args[0];
try {
test1();
test2();
test3();
test4();
} catch (Exception e) {
System.out.println("ERROR Test Failed.");
e.printStackTrace();
}
}
public static void test1() {
try {
System.out.println("--------------- TEST 1 -------------------");
VirtModel vdata = VirtModel.openDatabaseModel("test:inf1", URL, uid, pwd);
vdata.removeAll();
String NS = PrintUtil.egNS;
Resource c1 = vdata.createResource(NS + "C1");
Resource c2 = vdata.createResource(NS + "C2");
Resource c3 = vdata.createResource(NS + "C3");
vdata.add(c2, RDFS.subClassOf, c3);
InfModel im = ModelFactory.createInfModel(ReasonerRegistry.getRDFSReasoner(), vdata);
print_model("Data in DB", vdata);
print_model("Data in Inferenced Model", im);
Model premise = ModelFactory.createDefaultModel();
premise.add(c1, RDFS.subClassOf, c2);
print_model("Test listStatements",im.listStatements(c1, RDFS.subClassOf, null, premise));
} catch (Exception e) {
System.out.println("ERROR Test Failed.");
e.printStackTrace();
}
}
public static void test2() {
try {
System.out.println("--------------- TEST 2 -------------------");
VirtModel vdata = VirtModel.openDatabaseModel("test:inf2", URL, uid, pwd);
vdata.removeAll();
String NS = PrintUtil.egNS;
Resource c1 = vdata.createResource(NS + "C1");
Resource c2 = vdata.createResource(NS + "C2");
Resource c3 = vdata.createResource(NS + "C3");
vdata.add(c2, RDFS.subClassOf, c3);
OntModel om = ModelFactory.createOntologyModel(OntModelSpec.RDFS_MEM_RDFS_INF, vdata);
print_model("Data in DB", vdata);
print_model("Data in Ontology Model", om);
Model premise = ModelFactory.createDefaultModel();
premise.add(c1, RDFS.subClassOf, c2);
print_model("Test listStatements",om.listStatements(c1, RDFS.subClassOf, null, premise));
} catch (Exception e) {
System.out.println("ERROR Test Failed.");
e.printStackTrace();
}
}
public static void test3() {
try {
System.out.println("--------------- TEST 3 -------------------");
VirtModel vdata = VirtModel.openDatabaseModel("test:inf3", URL, uid, pwd);
vdata.removeAll();
String NS = PrintUtil.egNS;
Resource c1 = vdata.createResource(NS + "C1");
Resource c2 = vdata.createResource(NS + "C2");
Resource c3 = vdata.createResource(NS + "C3");
vdata.add(c2, RDFS.subClassOf, c3);
vdata.add(c1, RDFS.subClassOf, c2);
InfModel im = ModelFactory.createInfModel(ReasonerRegistry.getRDFSReasoner(), vdata);
exec_select("Data in DB", vdata, "select * where {?s ?p ?o}");
exec_select("Data in Inferenced Model", im, "select * where {?s ?p ?o}");
exec_select("Data in Inferenced Model", im, "select * where {<"+c1+"> <"+RDFS.subClassOf+"> ?o}");
} catch (Exception e) {
System.out.println("ERROR Test Failed.");
e.printStackTrace();
}
}
public static void test4() {
try {
System.out.println("--------------- TEST 4 -------------------");
VirtModel vdata = VirtModel.openDatabaseModel("test:inf4", URL, uid, pwd);
vdata.removeAll();
String NS = PrintUtil.egNS;
Resource c1 = vdata.createResource(NS + "C1");
Resource c2 = vdata.createResource(NS + "C2");
Resource c3 = vdata.createResource(NS + "C3");
vdata.add(c2, RDFS.subClassOf, c3);
vdata.add(c1, RDFS.subClassOf, c2);
OntModel om = ModelFactory.createOntologyModel(OntModelSpec.RDFS_MEM_RDFS_INF, vdata);
exec_select("Data in DB", vdata, "select * where {?s ?p ?o}");
exec_select("Data in Ontology Model", om, "select * where {?s ?p ?o}");
exec_select("Data in Ontology", om, "select * where {<"+c1+"> <"+RDFS.subClassOf+"> ?o}");
} catch (Exception e) {
System.out.println("ERROR Test Failed.");
e.printStackTrace();
}
}
}
</verbatim>
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