Examples of com.hp.hpl.jena.graph.Graph

com.hp.hpl.jena.graph.Graph
The interface to be satisfied by implementations maintaining collections of RDF triples. The core interface is small (add, delete, find, contains) and is augmented by additional classes to handle more complicated matters such as reification, query handling, bulk update, event management, and transaction handling.
For add(Triple) see GraphAdd.

    }
    
    @Override
    protected Iter<Quad> findInSpecificNamedGraph(Node g, Node s, Node p , Node o)
    {
        Graph graph = fetchGraph(g) ;
        if ( g == null )
            return Iter.nullIter() ;
        return triples2quads(g, graph.find(s, p, o)) ;
    }

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            TypedInputStream s = RDFDataMgr.open(source) ;
            Lang lang = RDFDataMgr.determineLang(source, s.getContentType(), null) ;
            
            if ( RDFLanguages.isTriples(lang) ) {
                // Triples
                Graph g = GraphFactory.createGraphMem() ;
                StreamRDF stream = StreamRDFLib.graph(g) ;
                RDFDataMgr.parse(stream, s, source) ;
                Graph g2 = graph(graphStore, dest) ;
                GraphUtil.addInto(g2, g) ;
            } else {
                // Quads
                if ( dest != null )
                    throw new UpdateException("Attempt to load quads into a graph") ;

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        gsCopyTriples(gStore, src, dest) ;
    }


    protected static void gsCopyTriples(GraphStore gStore, Target src, Target dest)
    {
        Graph gSrc = graph(gStore, src) ;
        Graph gDest = graph(gStore, dest) ;
        
        // Avoids concurrency problems by reading fully before writing
        ThresholdPolicy<Triple> policy = ThresholdPolicyFactory.policyFromContext(gStore.getContext());
        DataBag<Triple> db = BagFactory.newDefaultBag(policy, SerializationFactoryFinder.tripleSerializationFactory()) ;
        try

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    }


    protected static void gsClear(GraphStore gStore, Target target, boolean isSilent)
    {
        // No create - we tested earlier.
        Graph g = graph(gStore, target) ;
        g.clear() ;
    }

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    protected DatasetGraph processWith(UpdateModify update)
    {
        Node withGraph = update.getWithIRI() ;
        if ( withGraph == null )
            return null ;
        Graph g = graphOrDummy(graphStore, withGraph) ;
        DatasetGraph dsg = new DatasetGraphAltDefaultGraph(graphStore, g) ;
        return dsg ;
    }

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        return dsg ;
    }
    
    private Graph graphOrDummy(DatasetGraph dsg, Node gn)
    {
        Graph g = graph(graphStore, gn) ;
        if ( g == null )
            g = GraphFactory.createGraphMem() ;
        return g ;
    }

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        DatasetGraph dsg = graphStore ;
        if ( query != null )
        {
            if ( dftGraph != null )
            {
                Graph g = graphOrDummy(dsg, dftGraph) ;
                dsg = new DatasetGraphAltDefaultGraph(dsg, g) ;
            }
        }
        
        return evalBindings(query, dsg, inputBinding, context) ;

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    private void loadOne(String filename, boolean replace)
    {
        Monitor monitor = null ;
        
        Model model = modGraph.getModel(getStore()) ;
        Graph graph = model.getGraph() ;    


        if ( isVerbose() && replace )
            System.out.println("Emptying: "+filename) ;
        if (replace)
            model.removeAll();


        if ( isVerbose() || getModTime().timingEnabled() )
            System.out.println("Start load: "+filename) ;
        if ( getModTime().timingEnabled() )
        {
            monitor = new Monitor(getStore().getLoader().getChunkSize(), isVerbose()) ;
            graph.getEventManager().register(monitor) ;
        }


        // Crude but convenient
        if ( filename.indexOf(':') == -1 )
            filename = "file:"+filename ;


        String lang = FileUtils.guessLang(filename) ;
        
        // Always time, only print if enabled. 
        getModTime().startTimer() ;
        
        // Load here
        model.read(filename, lang) ;


        long timeMilli = getModTime().endTimer() ;
            
        if ( monitor != null )
        {
            System.out.println("Added "+monitor.addCount+" triples") ; 
        
            if ( getModTime().timingEnabled() && !isQuiet() )
                System.out.printf("Loaded in %.3f seconds [%d triples/s]\n", 
                                  timeMilli/1000.0, (1000*monitor.addCount/timeMilli)) ;
            graph.getEventManager().unregister(monitor) ;
        }
    }

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     *
     * @return The distinguished updateable graph, or null if there are no graphs
     *         in this composition
     */
    public Graph getRequiredBaseGraph() {
        Graph base = getBaseGraph();
        if (base == null) {
            throw new JenaException( "This polyadic graph should have a base graph, but none is defined" );
        }
        else {
            return base;

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         <code>s</code> rooted at <code>r</code>, bounded by this instances
         <code>boundary</code>.
    */
    public Model extractInto( Model model, Resource r, Model s )
        { TripleBoundary tb = boundary.asTripleBoundary( s );
        Graph g = getGraphExtract( tb ) .extractInto( model.getGraph(), r.asNode(), s.getGraph() );
        return ModelFactory.createModelForGraph( g ); }

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