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Posted to c-dev@xerces.apache.org by "Scott Cantor (JIRA)" <xe...@xml.apache.org> on 2018/03/12 02:34:00 UTC
[jira] [Closed] (XERCESC-1788) DOMParser API getting slow
[ https://issues.apache.org/jira/browse/XERCESC-1788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Scott Cantor closed XERCESC-1788.
---------------------------------
> 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
> Priority: Major
>
> 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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