The here function returns a node-set containing the attribute or
processing instruction node or the parent element of the text node
that directly bears the XPath expression. This expression results
in an error if the containing XPath expression does not appear in the
same XML document against which the XPath expression is being evaluated.
Node xpathOwnerNode = (Node) xctxt.getOwnerObject();
if (xpathOwnerNode == null) {
return null;
}
int xpathOwnerNodeDTM = xctxt.getDTMHandleFromNode(xpathOwnerNode);
int currentNode = xctxt.getCurrentNode();
DTM dtm = xctxt.getDTM(currentNode);
int docContext = dtm.getDocument();
if (DTM.NULL == docContext) {
error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);
}
{
// check whether currentNode and the node containing the XPath expression
// are in the same document
Document currentDoc =
XMLUtils.getOwnerDocument(dtm.getNode(currentNode));
Document xpathOwnerDoc = XMLUtils.getOwnerDocument(xpathOwnerNode);
if (currentDoc != xpathOwnerDoc) {
throw new TransformerException(I18n
.translate("xpath.funcHere.documentsDiffer"));
}
}
XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
NodeSetDTM nodeSet = nodes.mutableNodeset();
{
int hereNode = DTM.NULL;
switch (dtm.getNodeType(xpathOwnerNodeDTM)) {
case Node.ATTRIBUTE_NODE : {
// returns a node-set containing the attribute
hereNode = xpathOwnerNodeDTM;
nodeSet.addNode(hereNode);
break;
}
case Node.PROCESSING_INSTRUCTION_NODE : {
// returns a node-set containing the processing instruction node
hereNode = xpathOwnerNodeDTM;
nodeSet.addNode(hereNode);
break;
}
case Node.TEXT_NODE : {
// returns a node-set containing the parent element of the
// text node that directly bears the XPath expression
hereNode = dtm.getParent(xpathOwnerNodeDTM);
nodeSet.addNode(hereNode);
break;
}
default :
break;
}
}
/** $todo$ Do I have to do this detach() call? */
nodeSet.detach();
return nodes;
