Java Model.listStatements方法代码示例

import org.apache.jena.rdf.model.Model; //导入方法依赖的package包/类
@Test
public void testLoads() throws Exception {

  // cleanup earlier run. Can't delete dirs on windows after use.
  FileUtils.deleteDirectory(new File("tempTDB"));

  Model m = ModelLoader.loadModelToMem("Playpen2.ttl");
  assertTrue(m != null);
  Model mc = ModelLoader.loadModelToMem(m);
  assertTrue(mc != null);

  Model mtdb = ModelLoader.loadModelToTdb("Playpen2.ttl", "urn:mymodel", "tempTDB");
  assertTrue(mtdb != null);
  StmtIterator it = mtdb.listStatements();
  int nStmts = 0;
  while (it.hasNext()) {
    System.out.println(it.nextStatement().toString());
    nStmts++;
  }
  // this will fail on windows
  FileUtils.deleteDirectory(new File("tempTDB"));
  assertTrue(nStmts > 0);
}
 

import org.apache.jena.rdf.model.Model; //导入方法依赖的package包/类
@Test
public void testSimpleDiff() throws Exception {

  Model model2 = hydrateAndModifySecondModel();
  String sparql = DiffToSparqlInsertUpdateBuilder.buildSparqlInsertUpdate(
      RDFDifferenceBuilder.buildDifference(model, model2));
  System.out.println(sparql);
  assertTrue(sparql.startsWith("DELETE"));

  Resource res2 = model2.createResource("http://example/com/Playpen2#foobarFoo");
  StmtIterator it = model2.listStatements(res2, prop1, (RDFNode) null);
  Statement stmt = it.nextStatement();
  assertTrue(stmt.getObject().asLiteral().getBoolean() == false);

  it = model2.listStatements(res2, prop2, (RDFNode) null);
  stmt = it.nextStatement();
  assertTrue(stmt.getObject().asLiteral().getLong() == 1);

  it = model2.listStatements(res2, prop3, (RDFNode) null);
  stmt = it.nextStatement();
  XSDDateTime date = (XSDDateTime) stmt.getObject().asLiteral().getValue();

  it = model2.listStatements(res2, prop4, (RDFNode) null);
  stmt = it.nextStatement();
  Literal lit = stmt.getObject().asLiteral();
  String val = lit.getLexicalForm();
  String dataType = lit.getDatatype().getURI();
  assertTrue(val.equals("2017-01-01"));
  assertTrue(dataType.equals(XSDDatatype.XSDdate.getURI()));

  it = model2.listStatements(res2, prop5, (RDFNode) null);
  stmt = it.nextStatement();
  assertTrue(stmt.getObject().asLiteral().getString().equals("http://www.google.com"));
  assertTrue(stmt.getObject().asLiteral().getDatatype().getURI().equals(XSDDatatype.XSDanyURI.getURI()));

}
 

import org.apache.jena.rdf.model.Model; //导入方法依赖的package包/类
public Model hydrateAndModifySecondModel() {
  Model model2 = ModelFactory.createDefaultModel();
  model2.add(model);

  StmtIterator it = model2.listStatements(newConceptRes, null, (RDFNode) null);
  List<Statement> toDelete = Lists.newArrayList();
  while (it.hasNext()) {
    Statement stmt = it.nextStatement();
    toDelete.add(stmt);
  }
  model2.remove(toDelete);

  Resource foobarFooRes = model2.createResource("http://example/com/Playpen2#foobarFoo");
  foobarFooRes.addProperty(RDF.type, SKOS.Concept);

  foobarFooRes.addLiteral(prop1, false);
  foobarFooRes.addLiteral(prop2, 1);
  Calendar c = Calendar.getInstance();
  c.set(Calendar.YEAR, 2016);
  c.set(Calendar.DAY_OF_MONTH, 3);
  c.set(Calendar.MONTH, 10);
  foobarFooRes.addLiteral(prop3, model.createTypedLiteral(dtfmt.format(c.getTime()), XSDDatatype.XSDdate));
  foobarFooRes.addProperty(prop4, "2017-01-01", XSDDatatype.XSDdate);
  foobarFooRes.addProperty(prop5, "http://www.google.com", XSDDatatype.XSDanyURI);

  model2.addLiteral(foobarFooRes, prop6, model.createLiteral("2017-02-22", "en"));

  return model2;
}
 

import org.apache.jena.rdf.model.Model; //导入方法依赖的package包/类
/**
 * Extracts the key words from the model's statements.
 * This includes the Literals and the localNames of Resources and Predicates.
 * 
 * @param model Model to extract key words
 * @return List of key word strings
 */
 public List<String> getModelKeyWords(Model model) {

List<String> keyWords = new ArrayList<String>();
StmtIterator statementIter = model.listStatements();
Statement s;
Property predicate;
RDFNode object;

while (statementIter.hasNext()) {
  s = statementIter.nextStatement();
  predicate = s.getPredicate();
  object = s.getObject();
	
  keyWords.add(predicate.getLocalName());

  // local name of (non blank nodes) Resources
  if (object instanceof Resource && object.toString().contains("/")) {
	keyWords.add(object.asResource().getLocalName());
	  
  } else if (object instanceof Literal) {
	// object is a Literal
	keyWords.add(object.toString());
  }
 }
 return keyWords;
}
 

import org.apache.jena.rdf.model.Model; //导入方法依赖的package包/类
private Set<Triple> asTriples(Model model) {
	Set<Triple> triples = new HashSet<>((int) model.size());
	StmtIterator iterator = model.listStatements();
	while (iterator.hasNext()) {
		Statement statement = iterator.next();
		triples.add(statement.asTriple());
	}
	return triples;
}