/**
* Quickly build a dom tree. Use per item, not for trees with more than 2000 nodes (or about
* that). The XMLNodes are not in the Hibernate session and don't lazy load their parent or
* anything else. They should not need to, though. The attached XpathHolders are in the session
* and behave normally.
*
* @param parent
* @return
*/
public XMLNode getDOMTree(XMLNode parent) {
StatelessSession ss = DB.getStatelessSession();
List<XMLNode> l;
int maxNodes = 10000;
if (parent.getSize() < maxNodes) maxNodes = (int) parent.getSize();
Stack<XMLNode> stack = new Stack<XMLNode>();
HashMap<Long, XpathHolder> xpathCache = new HashMap<Long, XpathHolder>();
l =
ss.createSQLQuery(
"select * from xml_node_"
+ parent.getXmlObject().getDbID()
+ " where xml_node_id >= :parentId order by xml_node_id")
.addEntity(XMLNode.class)
.setLong("parentId", parent.getNodeId())
.setMaxResults(maxNodes)
.list();
// now every node has the wrong parent and XpathHolder and no Children..
for (XMLNode x : l) {
// find the right place in stack
x.setChildren(new ArrayList<XMLNode>());
while (!stack.isEmpty()) {
if (stack.peek().getNodeId() != x.getParentNode().getNodeId()) stack.pop();
else break;
}
if (!stack.isEmpty()) {
x.setParentNode(stack.peek());
stack.peek().getChildren().add(x);
}
stack.push(x);
// now the xpathholder
XpathHolder path = xpathCache.get(x.getXpathHolder().getDbID());
if (path == null) {
path = DB.getXpathHolderDAO().findById(x.getXpathHolder().getDbID(), false);
xpathCache.put(path.getDbID(), path);
}
x.setXpathHolder(path);
x.setXmlObject(parent.getXmlObject());
}
if (l.size() > 0) return l.get(0);
else return null;
}
/**
* Cursor over all nodes. (You still have to get XpathHolders the normal way) Call the index
* function on given object. Proceeds in node order.
*
* @param xo
* @param ni
*/
public void indexNodes(XmlObject xo, NodeIndexer ni) {
StatelessSession ss = DB.getStatelessSession();
Stack<XMLNode> stack = new Stack<XMLNode>();
HashMap<Long, XpathHolder> xpathCache = new HashMap<Long, XpathHolder>();
ScrollableResults sr = null;
try {
sr =
ss.createSQLQuery("select * from xml_node_" + xo.getDbID() + " order by xml_node_id")
.addEntity(XMLNode.class)
.scroll(ScrollMode.FORWARD_ONLY);
while (sr.next()) {
XMLNode x = (XMLNode) sr.get()[0];
while (!stack.isEmpty()) {
if ((x.getParentNode() == null)
|| (stack.peek().getNodeId() != x.getParentNode().getNodeId())) stack.pop();
else break;
}
stack.push(x);
// now the xpathholder
XpathHolder path = xpathCache.get(x.getXpathHolder().getDbID());
if (path == null) {
path = DB.getXpathHolderDAO().findById(x.getXpathHolder().getDbID(), false);
xpathCache.put(path.getDbID(), path);
}
x.setXpathHolder(path);
x.setXmlObject(xo);
// node ready to index
ni.index(x);
}
ni.index(null);
} catch (Exception e) {
log.error("Error while scrolling XMLNodes for indexing.", e);
} finally {
if (sr != null) sr.close();
}
}
