Examples with Dataset org.apache.jena.query.Dataset used on opensource projects

Example 86 with Dataset

use of org.apache.jena.query.Dataset in project jena by apache.

the class ExTDB3 method main.

public static void main(String... argv) {
    String assemblerFile = "Store/tdb-assembler.ttl";
    // Find a particular description in the file where there are several: 
    Model spec = RDFDataMgr.loadModel(assemblerFile);
    // Find the right starting point for the description in some way.
    Resource root = null;
    if (false)
        // If you know the Resource URI:
        root = spec.createResource("http://example/myChoiceOfURI");
    else {
        // Alternatively, look for the a single resource of the right type. 
        try {
            // Find the required description - the file can contain descriptions of many different types.
            root = GraphUtils.findRootByType(spec, VocabTDB.tDatasetTDB);
            if (root == null)
                throw new JenaException("Failed to find a suitable root");
        } catch (TypeNotUniqueException ex) {
            throw new JenaException("Multiple types for: " + DatasetAssemblerVocab.tDataset);
        }
    }
    Dataset ds = (Dataset) Assembler.general.open(root);
}

Example 87 with Dataset

use of org.apache.jena.query.Dataset in project jena by apache.

the class ExTDB5 method main.

public static void main(String... argv) {
    // Direct way: Make a TDB-back Jena model in the named directory.
    String directory = "MyDatabases/DB1";
    Dataset dataset = TDBFactory.createDataset(directory);
    // Potentially expensive query.
    String sparqlQueryString = "SELECT (count(*) AS ?count) { ?s ?p ?o }";
    // See http://incubator.apache.org/jena/documentation/query/app_api.html
    Query query = QueryFactory.create(sparqlQueryString);
    QueryExecution qexec = QueryExecutionFactory.create(query, dataset);
    try {
        ResultSet results = qexec.execSelect();
        for (; results.hasNext(); ) {
            QuerySolution soln = results.nextSolution();
            int count = soln.getLiteral("count").getInt();
            System.out.println("count = " + count);
        }
    } finally {
        qexec.close();
    }
    // Close the dataset.
    dataset.close();
}

Example 88 with Dataset

use of org.apache.jena.query.Dataset in project jena by apache.

the class TDBGraphAssembler method open.

@Override
public Model open(Assembler a, Resource root, Mode mode) {
    // Make a model - the default model of the TDB dataset
    // [] rdf:type tdb:GraphTDB ;
    //    tdb:location "dir" ;
    // Make a named model.
    // [] rdf:type tdb:GraphTDB ;
    //    tdb:location "dir" ;
    //    tdb:graphName <http://example/name> ;
    // Location or dataset reference.
    String locationDir = getStringValue(root, pLocation);
    Resource dataset = getResourceValue(root, pDataset);
    if (locationDir != null && dataset != null)
        throw new AssemblerException(root, "Both location and dataset given: exactly one required");
    if (locationDir == null && dataset == null)
        throw new AssemblerException(root, "Must give location or refer to a dataset description");
    String graphName = null;
    if (root.hasProperty(pGraphName1))
        graphName = getAsStringValue(root, pGraphName1);
    if (root.hasProperty(pGraphName2))
        graphName = getAsStringValue(root, pGraphName2);
    if (root.hasProperty(pIndex))
        Log.warn(this, "Custom indexes not implemented yet - ignored");
    final Dataset ds;
    if (locationDir != null) {
        Location location = Location.create(locationDir);
        ds = TDBFactory.createDataset(location);
    } else
        ds = DatasetAssemblerTDB.make(dataset);
    try {
        if (graphName != null)
            return ds.getNamedModel(graphName);
        else
            return ds.getDefaultModel();
    } catch (RuntimeException ex) {
        ex.printStackTrace(System.err);
        throw ex;
    }
}

Example 89 with Dataset

use of org.apache.jena.query.Dataset in project jena by apache.

the class TestDatasetTDBPersist method dataset5.

@Test
public void dataset5() {
    String graphName = "http://example/";
    Triple triple = SSE.parseTriple("(<x> <y> <z>)");
    Dataset ds = graphLocation.getDataset();
    Graph g2 = ds.asDatasetGraph().getGraph(org.apache.jena.graph.NodeFactory.createURI(graphName));
    // Graphs only exists if they have a triple in them
    g2.add(triple);
    assertTrue(ds.containsNamedModel(graphName));
    List<String> x = Iter.toList(ds.listNames());
    List<String> y = Arrays.asList(graphName);
    assertEquals(x, y);
    assertEquals(1, ds.asDatasetGraph().size());
}

Example 90 with Dataset

use of org.apache.jena.query.Dataset in project jena by apache.

the class TestDatasetTDBPersist method dataset3.

@Test
public void dataset3() {
    Dataset ds = graphLocation.getDataset();
    Graph g1 = ds.getDefaultModel().getGraph();
    // Sometimes, under windows, deleting the files by 
    // graphLocation.clearDirectory does not work.  
    // Needed for safe tests on windows.
    g1.clear();
    Graph g2 = ds.getNamedModel("http://example/").getGraph();
    g2.add(new Triple(n0, n1, n2));
    assertTrue(g2.contains(n0, n1, n2));
    assertFalse(g1.contains(n0, n1, n2));
}