DOMParser API getting slow
--------------------------
Key: XERCESC-1788
URL: https://issues.apache.org/jira/browse/XERCESC-1788
Project: Xerces-C++
Issue Type: Bug
Components: DOM
Affects Versions: 2.7.0
Environment: Windows XP, VC++ 6
Reporter: Sanish Kanjany
Fix For: Nightly build (please specify the date)
I have been using xerces-c2.2 for a long and now moved to xerces-c2.7. I was
using deprecated DOM_Parser(with 2.2) and now using XercesDOMParser(with 2.7)
itself. I had to write some wrappers for DOMNode, DOMDocument, DOMNodeList etc
to avoid changes in my existing code as DOM_Node, DOM_Document, DOM_NodeList
etc. I could see the parsing time is significantly reduced with xerces-2.7.
But some APIs to the parser is getting slow down.
For example, in the function given below, to get all element children of a
node, is very slow when the reference node has a large number of child nodes.
The function spends more time inside the for loop. The same function is very
fast with old version of xerces-c(2.2).
bool CMyDomParser::GetAllChildNodes(DOM_Node node, std::vector<DOM_Node>& nodes)
{
nodes.clear();
if(node == NULL)
return false;
DOM_NodeList nodelist = node.getChildNodes();
if(nodelist == NULL)
return true;
bool retval = false;
int iLisSize=nodelist.getLength();
for(int i=0; i < iLisSize; i++)
{
DOM_Node oTempNode=nodelist.item(i);
if(oTempNode.getNodeType() != DOM_Node::ELEMENT_NODE)
continue;
retval = true;
nodes.push_back(oTempNode);
}
return true;
}
What will be the base reason ?
Anyadvancement needed in my code?
Is there any change in implementation of DOMNodelist ::item(int) ?
Thanks,
Sanish
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