Examples of org.exist.dom.NodeProxy$SingleNodeIterator

org.exist.dom.NodeProxy
Placeholder class for DOM nodes. NodeProxy is an internal proxy class, acting as a placeholder for all types of persistent XML nodes during query processing. NodeProxy just stores the node's unique id and the document it belongs to. Query processing deals with these proxys most of the time. Using a NodeProxy is much cheaper than loading the actual node from the database. The real DOM node is only loaded, if further information is required for the evaluation of an XPath expression. To obtain the real node for a proxy, simply call {@link #getNode()}. All sets of type NodeSet operate on NodeProxys. A node set is a special type of sequence, so NodeProxy does also implement {@link org.exist.xquery.value.Item} andcan thus be an item in a sequence. Since, according to XPath 2, a single node is also a sequence, NodeProxy does itself extend NodeSet. It thus represents a node set containing just one, single node. @author Wolfgang Meier


        } else if (item.getType() == Type.ELEMENT || item.getType() == Type.DOCUMENT) {
            LOG.debug("Streaming element or document node");


            if (item instanceof NodeProxy) {
                final NodeProxy np = (NodeProxy) item;
                final String url = "xmldb:exist://" + np.getDocument().getBaseURI();
                LOG.debug("Document detected, adding URL " + url);
                streamSource.setSystemId(url);
            }


            // Node provided

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        } else if (item.getType() == Type.DOCUMENT || item.getType() == Type.NODE) {


            LOG.debug("Retreiving URL from (document) node");


            if (item instanceof NodeProxy) {
                final NodeProxy np = (NodeProxy) item;
                url = np.getDocument().getBaseURI();
                LOG.debug("Document detected, adding URL " + url);
            }


        }

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        for (final SequenceIterator i = args[0].iterate(); i.hasNext(); ) {
            final NodeValue v = (NodeValue) i.nextItem();
            if (v.getImplementationType() == NodeValue.IN_MEMORY_NODE) {
                result.add(v);
            } else {
                final NodeProxy p = (NodeProxy) v;
                processText(builder, p, result, func, args[2]);
            }
        }
        context.popDocumentContext();
        return result;

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    else {
      final NodeValue val = (NodeValue)args[0].itemAt(0);
      // Ranking cannot be applied to constructed nodes
      if(val.getImplementationType() == NodeValue.IN_MEMORY_NODE)
        {throw new XPathException(this, getName() + " cannot be applied to in-memory nodes.");}
      final NodeProxy proxy = (NodeProxy)val;  // this is a persistent node, so casting is safe
  
      int freq = 0;
      Match nextMatch = proxy.getMatches();
      // we just count the number of distinct terms matched
      while(nextMatch != null) {
        freq += nextMatch.getFrequency();
        nextMatch = nextMatch.getNextMatch();
      }

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      DBBroker broker = null;
      try {
          broker = pool.get(user);
          final DocumentImpl document = getDocument(broker, Lock.NO_LOCK);
          // this XMLResource represents a document
      return new NodeProxy(document, NodeId.DOCUMENT_NODE);
      } catch (final EXistException e) {
            throw new XMLDBException(ErrorCodes.INVALID_RESOURCE, e.getMessage(), e);
        } finally {
          pool.release(broker);
      pool.setSubject(preserveSubject);

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        final NodeValue docNode = (NodeValue) args[0].itemAt(0);
        if (docNode.getImplementationType() == NodeValue.IN_MEMORY_NODE) {
            return ((NodeImpl) docNode).getDocument().getNodeById(nodeId);
        } else {
            final DocumentImpl doc = ((NodeProxy)docNode).getDocument();
            return new NodeProxy(doc, nodeId);
        }
  }

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                    if(lockOnLoad)
                    {
            // add the document to the list of locked documents
            context.addLockedDocument(doc);
          }
          document = new NodeProxy(doc);
        }
      }
      catch(final PermissionDeniedException e)
      {
        throw e;

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        this.context = contextSet;
        this.contextId = contextId;
    }


    public NodeProxy match(DocumentImpl doc, NodeId nodeId) {
        final NodeProxy p = new NodeProxy(doc, nodeId);
        final NodeProxy contextNode = context.parentWithChild(doc, nodeId, false, false);
        if (contextNode == null)
            {return null;}
        if (Expression.NO_CONTEXT_ID != contextId) {
            p.deepCopyContext(contextNode, contextId);
        } else

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        enhancer.setSuperclass(NodeProxy.class);
        enhancer.setInterfaces(clazzes);
        enhancer.setCallbackFilter(callbackFilter);
        enhancer.setCallbacks(callbacks);
        
        final NodeProxy enhancedNodeProxy = (NodeProxy)enhancer.create(
            new Class[] {
                DocumentImpl.class,
                NodeId.class,
                short.class,
                long.class,

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    if (pos < 0 || pos >= resources.size())
      {return null;}
    final Object r = resources.get((int) pos);
    LocalXMLResource res = null;
    if (r instanceof NodeProxy) {
      final NodeProxy p = (NodeProxy) r;
      // the resource might belong to a different collection
      // than the one by which this resource set has been
      // generated: adjust if necessary.
      LocalCollection coll = collection;
      if (p.getDocument().getCollection() == null
        || coll.getCollection().getId() != p.getDocument().getCollection().getId()) {
        coll = new LocalCollection(user, brokerPool, null, p.getDocument().getCollection().getURI(), coll.getAccessContext());
        coll.properties = outputProperties;
      }
      res = new LocalXMLResource(user, brokerPool, coll, p);
    } else if (r instanceof Node) {
      res = new LocalXMLResource(user, brokerPool, collection, XmldbURI.EMPTY_URI);

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