Examples of org.apache.clerezza.rdf.utils.RdfList

org.apache.clerezza.rdf.utils.RdfList
An implementation of an java.util.List backed by an RDF collection (rdf:List). The list allows modification that are reflected to the underlying TripleCollection. It reads the data from the TripleCollection when it is first needed, so changes to the TripleCollection affecting the rdf:List may or may not have an effect on the values returned by instances of this class. For that reason only one instance of this class should be used for accessing an rdf:List of sublists thereof when the lists are being modified, having multiple lists exclusively for read operations (such as for immutable TripleCollections) is not problematic. @author rbn, mir


  protected void bindSystemGraph(LockableMGraph systemGraph) {
    Lock l = systemGraph.getLock().readLock();
    l.lock();
    try {
      List<Resource> rdfTypePriorityList = new RdfList(
         typePriorityListUri, systemGraph);
      typePriorityList  = new ArrayList<UriRef>(rdfTypePriorityList.size());
      for (Resource resource : rdfTypePriorityList) {
        if (resource instanceof UriRef) {
          typePriorityList.add((UriRef) resource);
        } else {
          log.warn("Type priority list contains a resource "

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    if (nextTo > userList.size()) {
      nextTo = userList.size();
    }


    NonLiteral userOverviewPage = new BNode();
    List<Resource> resultList = new RdfList(userOverviewPage, resultGraph);
    for (int i = from; i < to; i++) {
      resultList.add(userList.get(i).getNode());
    }
    
    UnionMGraph unionGraph = new UnionMGraph(resultGraph, systemGraph);
    
    GraphNode result = new GraphNode(userOverviewPage, unionGraph);

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    MGraph additionGraph = new SimpleMGraph();


    UnionMGraph resultGraph = new UnionMGraph(additionGraph, contentGraph);


    RdfList list = RdfList.createEmptyList(resultResource, additionGraph);
    resultGraph.add(new TripleImpl(resource,
        SCRIPTMANAGER.scriptList, resultResource));
    resultGraph.add(new TripleImpl(resultResource, RDF.type,
        SCRIPTMANAGER.ScriptList));
    
    Iterator<Triple> it =
        contentGraph.filter(null, RDF.type, SCRIPT.Script);
    while (it.hasNext()) {
      list.add(it.next().getSubject());
    }
    return new GraphNode(resultResource,
        new UnionMGraph(resultGraph, contentGraph));
  }

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  private GraphNode addLanguages(GraphNode node, NonLiteral platformInstance, List<LanguageDescription> languages,
      boolean copyToNode) {
    TripleCollection graph = node.getGraph();
    BNode listNode = new BNode();    
    RdfList list = new RdfList(listNode, graph);
    LockableMGraph configGraph = getConfigGraph();
    Lock readLock = configGraph.getLock().readLock();
    for (LanguageDescription languageDescription : languages) {
      NonLiteral languageUri = (NonLiteral) languageDescription.getResource().getNode();
      list.add(languageUri);
      if (copyToNode) {
        readLock.lock();
        try {
          graph.addAll(new GraphNode(languageUri, configGraph).getNodeContext());
        } finally {

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    Lock writeLock = systemGraph.getLock().writeLock();
    writeLock.lock();
    try {
      // the constructor of RdfList might write to the graph! => requires a write lock
      final RdfList rdfList = new RdfList(listNode, systemGraph);
      languageList = Collections.synchronizedList(rdfList);
      //access to languages should not require access to system graph,
      //so copying the resources to an ArrayList
      languageListCache = Collections.synchronizedList(
          new ArrayList<Resource>(rdfList));

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  public GraphNode list(@Context UriInfo uriInfo) {
    TrailingSlash.enforcePresent(uriInfo);
    TripleCollection resultGraph = new SimpleMGraph();
    LockableMGraph contentGraph = cgProvider.getContentGraph();
    GraphNode result = new GraphNode(new BNode(), new UnionMGraph(resultGraph, contentGraph));
    RdfList list = new RdfList(result);    
    Lock l = contentGraph.getLock().readLock();
    l.lock();
    try {
      Iterator<Triple> greetings = contentGraph.filter(null, RDF.type, CURIE.CuriePrefixBinding);
      while (greetings.hasNext()) {
        list.add(greetings.next().getSubject());
      }
    } finally {
      l.unlock();
    }
    result.addProperty(RDF.type, CURIE.CuriePrefixBindingList);

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    return menus;
  }
  
  private NonLiteral asRdfList(SortedSet<Menu> menus, TripleCollection mGraph) {
    NonLiteral result = new BNode();
    RdfList list = new RdfList(result, mGraph);
    for (Menu menu : menus) {
      BNode node = new BNode();
      final String label = menu.root.getLabel();
      Literal labelLiteral = new PlainLiteralImpl(label);
      mGraph.add(new TripleImpl(node, RDFS.label,labelLiteral));
      final String description = menu.root.getDescription();
      if (description != null) {
        Literal descLiteral = new PlainLiteralImpl(description);
        mGraph.add(new TripleImpl(node, DCTERMS.description, descLiteral));
      }
      final String path = menu.root.getPath();
      if (path != null) {
        Literal pathLiteral = LiteralFactory.getInstance().
            createTypedLiteral(path);
        mGraph.add(new TripleImpl(node, GLOBALMENU.path, pathLiteral));
      }
      if (menu.children.size() > 0) {
        mGraph.add(new TripleImpl(node, GLOBALMENU.children, 
            itemsAsRdfList(menu.children, mGraph)));
        mGraph.add(new TripleImpl(node, RDF.type, GLOBALMENU.Menu));
      } else {
        mGraph.add(new TripleImpl(node, RDF.type, GLOBALMENU.MenuItem));
      }
      list.add(node);
      
    }
    return result;
  }

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    return result;
  }


  private NonLiteral itemsAsRdfList(SortedSet<GlobalMenuItem> menus, TripleCollection mGraph) {
    NonLiteral result = new BNode();
    RdfList list = new RdfList(result, mGraph);
    for (GlobalMenuItem item : menus) {
      BNode node = new BNode();
      final String label = item.getLabel();
      Literal labelLiteral = new PlainLiteralImpl(label);
      mGraph.add(new TripleImpl(node, RDFS.label,labelLiteral));
      final String description = item.getDescription();
      if (description != null) {
        Literal descLiteral = new PlainLiteralImpl(description);
        mGraph.add(new TripleImpl(node, DCTERMS.description, descLiteral));
      }
      final String path = item.getPath();
      if (path != null) {
        Literal pathLiteral = LiteralFactory.getInstance().
            createTypedLiteral(path);
        mGraph.add(new TripleImpl(node, GLOBALMENU.path, pathLiteral));
      }
      mGraph.add(new TripleImpl(node, RDF.type, GLOBALMENU.MenuItem));
      list.add(node);
    }
    return result;
  }

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    GraphNode node = new GraphNode(new BNode(), new SimpleMGraph());
    contextProvider.addUserContext(node);
    Iterator<Resource> iter = node.getObjects(GLOBALMENU.globalMenu);
    Assert.assertTrue(iter.hasNext());
    TripleCollection graph = node.getGraph();
    RdfList list = new RdfList((NonLiteral)iter.next(), graph);
    Assert.assertEquals(3, list.size());
    Assert.assertEquals(GlobalMenuItemsProviderA.groupALabel,
        getLabel(graph, list.get(0)));
    Assert.assertEquals(GlobalMenuItemsProviderA.groupCLabel,
        getLabel(graph, list.get(1)));
    Assert.assertEquals(GlobalMenuItemsProviderA.implicitGroupBLabel,
        getLabel(graph, list.get(2)));    
    Assert.assertEquals(GLOBALMENU.Menu, getRdfType(graph, list.get(0)));
    Assert.assertEquals(GLOBALMENU.MenuItem, getRdfType(graph, list.get(1)));    
    Assert.assertEquals(GlobalMenuItemsProviderA.groupAPath,
        getPath(graph, list.get(0)));
    RdfList children = getChildren(graph, list.get(0));
    Assert.assertEquals(2, children.size());
    Assert.assertEquals(GlobalMenuItemsProviderA.itemA2Label,
        getLabel(graph, children.get(0)));
    Assert.assertEquals(GlobalMenuItemsProviderA.itemA1Label,
        getLabel(graph, children.get(1)));
    Assert.assertEquals(GlobalMenuItemsProviderA.itemA2Path,
        getPath(graph, children.get(0)));
  }

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  }


  private RdfList getChildren(TripleCollection graph, Resource res) {
    NonLiteral children = (NonLiteral) graph.filter((NonLiteral) res,
        GLOBALMENU.children, null).next().getObject();
    return new RdfList(children, graph);
  }

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