Examples of com.hp.hpl.jena.sparql.core.DatasetGraph

com.hp.hpl.jena.sparql.core.DatasetGraph
DatasetGraph: The graph representation of an RDF Dataset. See {@link Dataset}for the Model level of an RDF dataset.
Whether a dataset contains a graph if there are no triples is not defined; see the specific implementation.

        
        boolean nonTxnData = true ;
        
        StoreConnection sConn = getStoreConnection() ;
        Location loc = sConn.getLocation() ;
        DatasetGraph dsg = sConn.getBaseDataset() ;
        if ( nonTxnData ) 
        {
            dsg.add(q) ;
            TDB.sync(dsg) ;
            assertTrue(dsg.contains(q)) ;
        }


        DatasetGraphTxn dsgTxn = sConn.begin(ReadWrite.WRITE) ;
        if ( nonTxnData ) 
            assertTrue(dsgTxn.contains(q)) ;
        dsgTxn.add(q1) ;
        assertTrue(dsgTxn.contains(q1)) ;
        if ( nonTxnData ) 
            assertTrue(dsgTxn.contains(q)) ;
        dsgTxn.commit() ;
        dsgTxn.end() ;


        // Should have flushed to disk.
        if ( nonTxnData ) 
        {
            sConn.forceRecoverFromJournal() ;
            assertTrue(dsg.contains(q)) ;
        }
        assertTrue(dsg.contains(q1)) ;
        
        // release via the transactional machinery 
        StoreConnection.release(loc) ;
        sConn = null ;
        
        StoreConnection sConn2 = StoreConnection.make(loc) ;
        DatasetGraph dsg2 = sConn2.getBaseDataset() ;
        
        if ( nonTxnData ) 
            assertTrue(dsg2.contains(q)) ;
        assertTrue(dsg2.contains(q1)) ;
        
        DatasetGraphTxn dsgTxn2 = sConn2.begin(ReadWrite.READ) ;
        if ( nonTxnData ) 
            assertTrue(dsgTxn2.contains(q)) ;
        assertTrue(dsgTxn2.contains(q1)) ;

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        try {
            parser.parse() ;
        } 
        catch (RiotException ex) { errorBadRequest("Parse error: "+ex.getMessage()) ; }
        finally { sink.close() ; }
        DatasetGraph dsgTmp = DatasetGraphFactory.create(graphTmp) ;
        
        return dsgTmp ;
    }

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  /** Create a memory DatasetGraph and read in some data
     * @see #read(DatasetGraph,String) 
     */ 
    public static DatasetGraph loadDatasetGraph(String uri)
  {
    DatasetGraph ds = createDatasetGraph() ;
        read(ds, uri) ;
        return ds ;
  }

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  /** Create a memory DatasetGraph and read in some data
     * @see #read(DatasetGraph,String,Lang) 
     */
    public static DatasetGraph loadDatasetGraph(String uri, Lang lang)
  {
    DatasetGraph ds = createDatasetGraph() ;
        read(ds, uri, lang) ;
        return ds ;  
  }

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    protected DatasetGraph getDatasetGraph() {
        return getDataset().asDatasetGraph() ;
    }


    protected DatasetGraphTDB getDatasetGraphTDB() {
        DatasetGraph dsg = getDatasetGraph() ;
        return TDBInternal.getBaseDatasetGraphTDB(dsg) ;
    }

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    protected static QueryExecution make(Query query, Dataset dataset, Context context)
    {
        query.setResultVars() ;
        if ( context == null )
            context = ARQ.getContext();  // .copy done in QueryExecutionBase -> Context.setupContext. 
        DatasetGraph dsg = null ;
        if ( dataset != null )
            dsg = dataset.asDatasetGraph() ;
        QueryEngineFactory f = findFactory(query, dsg, context);
        if ( f == null )
        {

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    @Override
    public RDFDataset parse(Object object) throws JsonLdError {
        RDFDataset result = new RDFDataset() ;
        if ( object instanceof DatasetGraph )
        {
            DatasetGraph dsg = (DatasetGraph)object ;


            Iterator<Quad> iter = dsg.find() ;
            for ( ; iter.hasNext() ; )
            {
                Quad q = iter.next() ;
                Node s = q.getSubject() ;
                Node p = q.getPredicate() ;

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        syncObject(graph) ;
    }


    /** Sync a TDB-backed Dataset. Do nothing if not TDB-backed. */
    public static void sync(Dataset dataset) {
        DatasetGraph ds = dataset.asDatasetGraph() ;
        sync(ds) ;
    }

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        if ( !exactlyOneProperty(root, pLocation) )
            throw new AssemblerException(root, "No location given") ;


        String dir = getStringValue(root, pLocation) ;
        Location loc = new Location(dir) ;
        DatasetGraph dsg = TDBFactory.createDatasetGraph(loc) ;


        if ( root.hasProperty(pUnionDefaultGraph) ) {
            Node b = root.getProperty(pUnionDefaultGraph).getObject().asNode() ;
            NodeValue nv = NodeValue.makeNode(b) ;
            if ( nv.isBoolean() )
                dsg.getContext().set(TDB.symUnionDefaultGraph, nv.getBoolean()) ;
            else
                Log.warn(DatasetAssemblerTDB.class, "Failed to recognize value for union graph setting (ignored): " + b) ;
        }


        /*
        <r> rdf:type tdb:DatasetTDB ;
            tdb:location "dir" ;
            //ja:context [ ja:cxtName "arq:queryTimeout" ;  ja:cxtValue "10000" ] ;
            tdb:unionGraph true ; # or "true"
        */
        AssemblerUtils.setContext(root, dsg.getContext());
        return DatasetFactory.create(dsg) ; 
    }

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        return ds ;
    }


    public Dataset createDataset(Assembler a, Resource root, Mode mode) {
        // Expanding version.
        DatasetGraph dsg = DatasetGraphFactory.createMem() ;
        AssemblerUtils.setContext(root, dsg.getContext()) ;


        Dataset ds = DatasetFactory.create(dsg) ;


        // -------- Default graph
        // Can use ja:graph or ja:defaultGraph

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