Ways create Xpath Expressions and evaluate them.

[Sami Islam]

Title: Ways create Xpath Expressions and evaluate them.

Hello,
I found atleast 2 ways to create Xpath Expressions and evaluate them. Is there any documentation where I can find more info on which is the better way or perhaps which is suitable for what situations?

Can someone give me some insight on this?

1) With XPathEvaluator e.g.

// Initialize stuff...
XPathEvaluator  theEvaluator;

XalanNode* const theContextNode = theEvaluator.selectSingleNode(
                                        theDOMSupport,
                                        theDocument,
                                        XalanDOMString(argv[2]).c_str(),
                                        thePrefixResolver);
NodeRefList theNodeList = theEvaluator.selectNodeList(
                                theDOMSupport,
                                theContextNode,
                                XalanDOMString(argv[3]).c_str(),
                                thePrefixResolver);

size_t numNodes = theNodeList.getLength();

for(size_t i=0; i<numNodes; ++i)
{      
        XalanNode* const        node = theNodeList.item(i);
        XalanDOMString          str;
        const int theType = node->getNodeType();
       
        // Do stuff with Nodes and Elements.
}

2) With Xpath Object e.g.

// Initialize stuff...
XPath* const    contextXPath = theXPathFactory.create();

theXPathProcessor.initXPath(*contextXPath,
                                theXPathConstructionContext,
                                XalanDOMString(context),
                                ElementPrefixResolverProxy(rootElem, theEnvSupport, theDOMSupport));

XObjectPtr      xObj = contextXPath->execute(rootElem,
                                                ElementPrefixResolverProxy(rootElem, theEnvSupport, theDOMSupport),
                                                theExecutionContext);

const NodeRefListBase&  contextNodeList = xObj->nodeset();

const unsigned int      theLength = contextNodeList.getLength();

XPath* const    xpath = theXPathFactory.create();
theXPathProcessor.initXPath(*xpath,
                                theXPathConstructionContext,
                                TranscodeFromLocalCodePage(expr),
                                ElementPrefixResolverProxy(rootElem, theEnvSupport, theDOMSupport));

xObj = xpath->execute(contextNodeList.item(0),
                                ElementPrefixResolverProxy(rootElem, theEnvSupport, theDOMSupport),
                                theExecutionContext);

switch (xObj->getType())
// Do stuff with Nodes and Elements.

Regards

Sami

Regards,

Sami