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

    
    ValueSequence returnSeq = new ValueSequence();


    try {
      for (DocumentImpl doc : MetaData.get().matchDocuments(args[0].getStringValue(), args[1].getStringValue())) {
        returnSeq.add(new NodeProxy(doc));
      }
    } catch (Exception e) {
      throw new XPathException(this, e);
    }

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          }
  //        LOG.debug(current.debugContext());
          while (context != null) {
                      //TODO : Is this the context we want ? Not sure... would have prefered the LetExpr.
            if (context.getContextId() == whereExpr.getContextId()) {
              final NodeProxy contextNode = context.getNode();                    
              if(contextIsVirtual || contextSet.contains(contextNode)) {
                              contextNode.addMatches(current);
                result.add(contextNode, sizeHint);
              }
            }
                      context = context.getNextDirect();
          }

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        return Sequence.EMPTY_SEQUENCE;


    ValueSequence returnSeq = new ValueSequence();
    
    if (meta.getValue() instanceof DocumentImpl) {
      returnSeq.add( new NodeProxy( (DocumentImpl) meta.getValue() ) );
    
    } else {
      returnSeq.add(new StringValue(meta.getValue().toString()));
    }

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


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

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  public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
    try {
      DocumentImpl doc = MetaData.get().getDocument(args[0].getStringValue());
      if (doc == null) return Sequence.EMPTY_SEQUENCE;
      
      return new NodeProxy(doc);
    } catch (Exception e) {
      throw new XPathException(this, e);
    }
  }

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    if (n != null && n instanceof org.exist.memtree.NodeImpl) {
      
      final XmldbURI[] docs = new XmldbURI[] { XmldbURI.create(res.getParentCollection().getName()) };
      return doQuery(query, docs, (org.exist.memtree.NodeImpl)n, sortBy);
    }
    final NodeProxy node = ((LocalXMLResource) res).getNode();
    if (node == null) {
      // resource is a document
            //TODO : use dedicated function in XmldbURI
      final XmldbURI[] docs = new XmldbURI[] { XmldbURI.create(res.getParentCollection().getName()).append(res.getDocumentId()) };
      return doQuery(query, docs, null, sortBy);
    } else {
      final NodeSet set = new ExtArrayNodeSet(1);
      set.add(node);
      final XmldbURI[] docs = new XmldbURI[] { node.getDocument().getURI() };
      return doQuery(query, docs, set, sortBy);
    }
  }

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    return execute(null, null, expression, null);
  }
  
  public ResourceSet execute(XMLResource res, CompiledExpression expression)
      throws XMLDBException {
    final NodeProxy node = ((LocalXMLResource) res).getNode();
    if (node == null) {
      // resource is a document
      final XmldbURI[] docs = new XmldbURI[] { XmldbURI.create(res.getParentCollection().getName()).append(res.getDocumentId()) };
      return execute(docs, null, expression, null);
    } else {
      final NodeSet set = new ExtArrayNodeSet(1);
      set.add(node);
      final XmldbURI[] docs = new XmldbURI[] { node.getDocument().getURI() };
      return execute(docs, set, expression, null);
    }
  }

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      // iterate through children
      for (int i = 0; i < children.getLength(); i++) {
        final StoredNode node = (StoredNode) children.item(i);
        final Iterator<StoredNode> domIter = broker.getNodeIterator(node);
        domIter.next();
        final NodeProxy p = new NodeProxy(node);
        serializeToReceiver(node, domIter, (DocumentImpl)node.getOwnerDocument(), 
            true, p.getMatches(), new TreeSet<String>());
      }


      if (generateDocEvent) {receiver.endDocument();}


      if (LOG.isDebugEnabled())

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