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* 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
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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* See the License for the specific language governing permissions and
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package arq.examples.constructquads;
import java.io.* ;
import java.util.Iterator;
import org.apache.jena.graph.Triple;
import org.apache.jena.query.* ;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.ModelFactory;
import org.apache.jena.rdf.model.Property;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.riot.Lang;
import org.apache.jena.riot.RDFDataMgr;
import org.apache.jena.sparql.core.Quad;
import org.apache.jena.util.PrintUtil;
public class ExampleConstructQuads {
public static void main(String[] args) throws FileNotFoundException, IOException {
// create testing data :
// 1) default graph data
Model model = ModelFactory.createDefaultModel();
Resource s = model.createResource("http://eg.com/s");
Property p = model.createProperty("http://eg.com/p");
Resource o = model.createResource("http://eg.com/o");
model.add(s, p, o);
Dataset dataset = DatasetFactory.create(model);
// 2) named graph data
Model model1 = ModelFactory.createDefaultModel();
Resource s1 = model.createResource("http://eg.com/s1");
Property p1 = model.createProperty("http://eg.com/p1");
Resource o1 = model.createResource("http://eg.com/o1");
model1.add(s1, p1, o1);
dataset.addNamedModel("http://eg.com/g1", model1);
PrintUtil.printOut(dataset.asDatasetGraph().find());
// construct named graph
System.out.println("construct named graph:");
String queryString = "CONSTRUCT { GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} } WHERE{ GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} }";
Query query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Quad> quads = qexec.execConstructQuads();
PrintUtil.printOut(quads);
}
System.out.println(query);
// construct default graph 1
System.out.println("construct default graph 1:");
queryString = "CONSTRUCT { {<http://eg.com/s1> <http://eg.com/p1> ?o} } WHERE{ GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} }";
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Quad> quads = qexec.execConstructQuads();
PrintUtil.printOut(quads);
}
System.out.println(query);
// construct default graph 2
System.out.println("construct default graph 2:");
queryString = "CONSTRUCT {<http://eg.com/s1> <http://eg.com/p1> ?o} WHERE{ GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} }";
query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Quad> quads = qexec.execConstructQuads();
PrintUtil.printOut(quads);
}
System.out.println(query);
// construct triples
System.out.println("construct default graph 2:");
queryString = "CONSTRUCT {<http://eg.com/s1> <http://eg.com/p1> ?o} WHERE{ GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} }";
query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Triple> triples = qexec.execConstructTriples();
PrintUtil.printOut(triples);
}
System.out.println(query);
// construct dataset
System.out.println("construct dataset:");
queryString = "CONSTRUCT { GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} } WHERE{ GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} }";
query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Dataset d = qexec.execConstructDataset();
RDFDataMgr.write(System.out, d, Lang.TRIG);
}
System.out.println(query);
// short form 1
System.out.println("short form 1:");
queryString = "CONSTRUCT WHERE{ GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} }";
query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Quad> quads = qexec.execConstructQuads();
PrintUtil.printOut(quads);
}
System.out.println(query);
// short form 2
System.out.println("short form 2:");
queryString = "CONSTRUCT WHERE{ <http://eg.com/s> <http://eg.com/p> ?o }";
query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Quad> quads = qexec.execConstructQuads();
PrintUtil.printOut(quads);
}
System.out.println(query);
// short form 3
System.out.println("short form 3:");
queryString = "CONSTRUCT WHERE{ <http://eg.com/s> <http://eg.com/p> ?o }";
query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Triple> triples = qexec.execConstructTriples();
PrintUtil.printOut(triples);
}
System.out.println(query);
// short form 4
System.out.println("short form 4:");
queryString = "CONSTRUCT WHERE{ {<http://eg.com/s> <http://eg.com/p> ?o} }";
query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Quad> quads = qexec.execConstructQuads();
PrintUtil.printOut(quads);
}
System.out.println(query);
// short form 4
System.out.println("default graph projection:");
queryString = "CONSTRUCT { {<http://eg.com/s> <http://eg.com/p> ?o} GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} } WHERE{ GRAPH ?g {<http://eg.com/s1> <http://eg.com/p1> ?o} }";
query = QueryFactory.create(queryString, Syntax.syntaxARQ);
try (QueryExecution qexec = QueryExecutionFactory
.create(query, dataset)) {
Iterator<Triple> triples = qexec.execConstructTriples();
PrintUtil.printOut(triples);
}
System.out.println(query);
// run-construct-quad-test
System.out.println("run-construct-quad-test:");
File[] tests = new File("testing/ARQ/Syntax/Syntax-ARQ")
.listFiles((dir, fname)->{
if (fname.startsWith("syntax-quad-construct-")) {
return true;
}
return false;
});
for (File test : tests) {
System.out.println("======== File: "+test.getName());
try (BufferedReader br = new BufferedReader(new FileReader(test))) {
String line = null;
while( (line = br.readLine()) != null){
System.out.println(line);
}
}
System.out.println("==== Output of parse/print file "+ test.getName());
try {
Query q = QueryFactory.read(test.getAbsolutePath(), Syntax.syntaxARQ) ;
System.out.println(q);
} catch (QueryParseException ex) {
System.out.println("File "+test.getAbsolutePath()+ " : "+ex.getMessage()) ;
}
}
}
}