Examples of com.clarkparsia.empire.ds.TripleSource

com.clarkparsia.empire.ds.TripleSource

Interface which extends a {@link DataSource} to provide triple-level access to the contents of the data. Where DataSource only provides query level access, TripleSource provides the ability to make SPO "queries" into the database. When the underlying implementation natively supports this interface, there is usually a performance benefit of the "native" access when compared to writing a SPARQL query that will retrieve the same set of statements.
@author Pedro Oliveira @author Michael Grove @since 0.7 @version 0.7

        Map<String, Object> aMap = Maps.newHashMap();
        aMap.put("factory", "sesame");


        DataSource aSesameSource = Empire.get().persistenceProvider().createDataSource("test-sesame", aMap);


        TripleSource aTripleSrc = DataSourceUtil.asTripleSource(aSesameSource);


        // Sesame sources are triple sources
        assertTrue(aSesameSource == aTripleSrc);
    }

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  public void testDuplicate() throws Exception {
    EntityManager em = createEntityManager();


    assumeTrue(em.getDelegate() instanceof TripleSource);


    TripleSource aSource = (TripleSource) em.getDelegate();


    EntityTest aObj = InstanceGenerator.generateInstanceClass(EntityTest.class).newInstance();
    aObj.setId("someid");
    aObj.setLabel("some label");


    em.persist(aObj);


    aObj.setLabel("foo");


    em.merge(aObj);


    Graph aGraph = Graphs.newGraph(aSource.getStatements(null, null, null));


    assertEquals(3, aGraph.size());
    assertEquals(1, Lists.newArrayList(aGraph.match(null, ValueFactoryImpl.getInstance().createURI("urn:label"), null)).size());


    em.remove(aObj);


    ParentEntity pe = InstanceGenerator.generateInstanceClass(ParentEntity.class).newInstance();
    pe.setEntity(aObj);


    em.persist(pe);


    aGraph = Graphs.newGraph(aSource.getStatements(null, null, null));


    assertEquals(5, aGraph.size());
    assertEquals(1, Lists.newArrayList(aGraph.match(null, ValueFactoryImpl.getInstance().createURI("urn:label"), null)).size());


    aObj.setLabel("foobarbaz");


    em.merge(pe);


    aGraph = Graphs.newGraph(aSource.getStatements(null, null, null));


    assertEquals(5, aGraph.size());
    assertEquals(1, Lists.newArrayList(aGraph.match(null, ValueFactoryImpl.getInstance().createURI("urn:label"), null)).size());
  }

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  public void testDuplicate2() throws Exception {
    EntityManager em = createEntityManager();


    assumeTrue(em.getDelegate() instanceof TripleSource);
    
    TripleSource aSource = (TripleSource) em.getDelegate();


    EntityTest aObj = InstanceGenerator.generateInstanceClass(EntityTest.class).newInstance();
    aObj.setId("someid");
    aObj.setLabel("some label");


    em.persist(aObj);


    em.refresh(aObj);


    aObj.setLabel("foo");


    em.merge(aObj);


    Graph aGraph = Graphs.newGraph(aSource.getStatements(null, null, null));


    assertEquals(3, aGraph.size());
    assertEquals(1, Lists.newArrayList(aGraph.match(null, ValueFactoryImpl.getInstance().createURI("urn:label"), null)).size());


    em.remove(aObj);


    ParentEntity pe = InstanceGenerator.generateInstanceClass(ParentEntity.class).newInstance();
    pe.setEntity(aObj);


    em.persist(pe);


    em.refresh(pe);


    aGraph = Graphs.newGraph(aSource.getStatements(null, null, null));


    assertEquals(5, aGraph.size());
    assertEquals(1, Lists.newArrayList(aGraph.match(null, ValueFactoryImpl.getInstance().createURI("urn:label"), null)).size());


    aObj.setLabel("foobarbaz");


    em.merge(pe);


    aGraph = Graphs.newGraph(aSource.getStatements(null, null, null));


    assertEquals(5, aGraph.size());
    assertEquals(1, Lists.newArrayList(aGraph.match(null, ValueFactoryImpl.getInstance().createURI("urn:label"), null)).size());
  }

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    // this is a test source, so it should not be a TripleSource...


    assertFalse(aTestSource instanceof TripleSource);


    TripleSource aTripleSrc = DataSourceUtil.asTripleSource(aTestSource);


    assertTrue(aTestSource != aTripleSrc);
  }

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Related Classes of com.clarkparsia.empire.ds.TripleSource

com.clarkparsia.empire.EntityManagerTestSuite

com.clarkparsia.empire.sesame.TestSesameDS

com.clarkparsia.empire.TestDS

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