Examples of org.exist.dom.NodeProxy

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

        
        for (SequenceIterator nodesIter = args[1].iterate(); nodesIter.hasNext(); ) {
            NodeValue nv = (NodeValue) nodesIter.nextItem();
            if (nv.getImplementationType() == NodeValue.IN_MEMORY_NODE)
                throw new XPathException(this, "Cannot create order-index on an in-memory node");
            NodeProxy node = (NodeProxy) nv;
            SortItem si = new SortItemImpl(node);
          
            
            
            if (LOG.isDebugEnabled() && ++c % logChunk == 0) {

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    @Override
    public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
        if (args[1].isEmpty())
            return Sequence.EMPTY_SEQUENCE;
        String id = args[0].getStringValue();
        NodeProxy node = (NodeProxy) args[1].itemAt(0);
        SortIndexWorker index = (SortIndexWorker)
            context.getBroker().getIndexController().getWorkerByIndexId(SortIndex.ID);
        long pos = 0;
        try {
            pos = index.getIndex(id, node);

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                this.nodeIdValues.get(doc, ref);
                int units = ByteConversion.byteToShort(ref.bytes, ref.offset);
                NodeId nodeId = db.getNodeFactory().createFromData(units, ref.bytes, ref.offset + 2);
                //LOG.info("doc: " + docId + "; node: " + nodeId.toString() + "; units: " + units);


                NodeProxy storedNode = new NodeProxy(storedDocument, nodeId);
                if (qname != null)
                    storedNode.setNodeType(qname.getNameType() == ElementValue.ATTRIBUTE ? Node.ATTRIBUTE_NODE : Node.ELEMENT_NODE);


                LuceneMatch match = worker. new LuceneMatch(contextId, nodeId, query);
                match.setScore(score);
                storedNode.addMatch(match);
                callback.found(storedNode, score);
                //resultSet.add(storedNode, sizeHint);


            } catch (IOException e) {
                e.printStackTrace();

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            result = NodeSets.fmapNodes(nodes, new F<NodeProxy, NodeProxy>() {


                @Override
                public NodeProxy f(NodeProxy a) {
                    NodeProxy before = nodesContainingFirstINgrams.get(a);
                    if (before != null) {
                        return getContinuousMatches(before, a);
                    } else {
                        return null;
                    }

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      return args[0];
    
    NodeValue nv = (NodeValue) args[0].itemAt(0);
    if (!nv.isPersistentSet())
      return nv;
    NodeProxy node = (NodeProxy) nv;
    
    String matchStr = null;
    NodeId nodeId = null;
    try {
      for (EmbeddedXMLStreamReader reader = context.getBroker().getXMLStreamReader(node, true); reader.hasNext(); ) {
          int status = reader.next();
          if (status == XMLStreamConstants.CHARACTERS) {
            matchStr = reader.getText();
            nodeId = (NodeId) reader.getProperty(ExtendedXMLStreamReader.PROPERTY_NODE_ID);
            break;
          }
      }
    } catch (IOException e) {
      throw new XPathException(this, ErrorCodes.FOER0000, "Exception caught while reading document");
    } catch (XMLStreamException e) {
      throw new XPathException(this, ErrorCodes.FOER0000, "Exception caught while reading document");
    }
    
    if (nodeId != null) {
      Match match = new NGramMatch(getContextId(), node.getNodeId(), matchStr);
      match.addOffset(0, matchStr.length());
      node.addMatch(match);
    }
    return node;
  }

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            Match nextMatch = this.match;
            while (nextMatch != null) {
                if (proxy.getNodeId().isDescendantOf(nextMatch.getNodeId())) {
                    if (ancestors == null)
                        ancestors = new ExtArrayNodeSet();
                    ancestors.add(new NodeProxy(proxy.getDocument(), nextMatch.getNodeId()));
                }
                nextMatch = nextMatch.getNextMatch();
            }
            if (ancestors != null && !ancestors.isEmpty()) {
                for (NodeProxy p : ancestors) {

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                        super.characters(s.substring(offset.getOffset(), offset.getOffset() + offset.getLength()));
                        super.endElement(MATCH_ELEMENT);
                    } else {
                        try {
                            callback.match(nextListener, s.substring(offset.getOffset(), offset.getOffset() + offset.getLength()),
                                    new NodeProxy(getCurrentNode()));
                        } catch (XPathException e) {
                            throw new SAXException("An error occurred while calling match callback: " + e.getMessage(), e);
                        }
                    }
                    pos = offset.getOffset() + offset.getLength();

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                    NodeId previous = null;
                    for (int m = 0; m < occurrences; m++) {
                        NodeId nodeId = index.getBrokerPool().getNodeFactory().createFromStream(previous, is);
                        previous = nodeId;
                        int freq = is.readInt();
                        NodeProxy storedNode = new NodeProxy(storedDocument, nodeId);
                        // if a context set is specified, we can directly check if the
                        // matching node is a descendant of one of the nodes
                        // in the context set.
                        if (contextSet != null) {
                            int sizeHint = contextSet.getSizeHint(storedDocument);
                            if (returnAncestor) {
                                NodeProxy parentNode = contextSet.parentWithChild(storedNode, false, true, NodeProxy.UNKNOWN_NODE_LEVEL);
                                if (parentNode != null) {
                                    readMatches(ngram, is, nodeId, freq, parentNode);
                                    resultSet.add(parentNode, sizeHint);
                                } else
                                    is.skip(freq);

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                        int freq = is.readInt();
                        is.skip(freq);
                        boolean include = true;
                        //TODO : revisit
                        if (contextSet != null) {
                            NodeProxy parentNode = contextSet.parentWithChild(storedDocument, nodeId, false, true);
                            include = (parentNode != null);
                        }
                        if (include) {
                            Occurrences oc = map.get(term);
                            if (oc == null) {

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            assertNotNull(xquery);
            // test element ids
            Sequence seq = xquery.execute("doc('/db/test/test_string.xml')/test/para",
                    null, AccessContext.TEST);
            assertEquals(3, seq.getItemCount());
            NodeProxy comment = (NodeProxy) seq.itemAt(0);
            assertEquals(comment.getNodeId().toString(), "1.1");
            comment = (NodeProxy) seq.itemAt(1);
            assertEquals(comment.getNodeId().toString(), "1.3");
            comment = (NodeProxy) seq.itemAt(2);
            assertEquals(comment.getNodeId().toString(), "1.5");


            seq = xquery.execute("doc('/db/test/test_string.xml')/test//a",
                    null, AccessContext.TEST);
            assertEquals(1, seq.getItemCount());
            NodeProxy a = (NodeProxy) seq.itemAt(0);
            assertEquals("1.3.2", a.getNodeId().toString());


            // test attribute id
            seq = xquery.execute("doc('/db/test/test_string.xml')/test//a/@href",
                    null, AccessContext.TEST);
            assertEquals(1, seq.getItemCount());
            NodeProxy href = (NodeProxy) seq.itemAt(0);
            System.out.println(StorageAddress.toString(href.getInternalAddress()));
            assertEquals("1.3.2.1", href.getNodeId().toString());
            // test Attr deserialization
            Attr attr = (Attr) href.getNode();
            System.out.println(StorageAddress.toString(((StoredNode)attr).getInternalAddress()));
            // test Attr fields
            assertEquals(attr.getNodeName(), "href");
            assertEquals(attr.getName(), "href");
            assertEquals(attr.getValue(), "#");
             // test DOMFile.getNodeValue()
            assertEquals(href.getStringValue(), "#");


            // test text node
            seq = xquery.execute("doc('/db/test/test_string.xml')/test//b/text()",
                    null, AccessContext.TEST);
            assertEquals(1, seq.getItemCount());
            NodeProxy text = (NodeProxy) seq.itemAt(0);
            assertEquals("1.5.2.1", text.getNodeId().toString());
            // test DOMFile.getNodeValue()
            assertEquals(text.getStringValue(), "paragraph");
            // test Text deserialization
            Text node = (Text) text.getNode();
            assertEquals(node.getNodeValue(), "paragraph");
            assertEquals(node.getData(), "paragraph");
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());

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Related Classes of org.exist.dom.NodeProxy

org.exist.extensions.exquery.restxq.impl.adapters.DomEnhancingNodeProxyAdapter

org.exist.fluent.Item

org.exist.fulltext.FTMatchListener

org.exist.indexing.lucene.QueryNodes$DocumentHitCollector

org.exist.indexing.ngram.NGramIndexWorker$IndexScanCallback

org.exist.indexing.ngram.NGramIndexWorker$NGramMatchListener

org.exist.indexing.ngram.NGramIndexWorker$SearchCallback

org.exist.indexing.range.NodesFilter

org.exist.indexing.spatial.GMLHSQLIndexWorker

org.exist.numbering.DLNStorageTest

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