Berin,
Thanks! Are there any code samples of this kind of
transformation around? Specificly mapping back and forth.
And your point about the ::Initialize() calls is well taken.
Thanks again. -R
Berin Lautenbach writes:
> Russell,
>
> Not sure exactly what you are trying to do, but some thoughts.....
>
> You want to be doing all the initialisation prior to using any
> Xalan/Xerces objects. So :
>
> XMLPlatformUtils::Initialize();
> XPathEvaluator::initialize();
>
> Should be at the start of the code, and everything else should be in a
> procedure/method call or embedded in its own code block. I.e.
> {
> XercesParserLiaison theParserLiaison;
> ...
> }
>
> That way everything will be destroyed before you call terminate.
>
> Assuming you pull the Xerces DOMDocument from the ParserLiaison, any
> changes you make to it will not be mirrored in the XalanDOM - the map
> between is (by default) built at the point when the document is created
> and is not modified after that point.
>
> I _think_ you can set it (using
> XercesParserLiaison::setBuildWrapperNodes(false)) so that the maps are
> not build until called on, and that may cause nodes that you have
> created to be auto-added to the wrapper map. HOWEVER - I'd say this is
> extremely unwise as modifications to existing nodes may not be detected
> and deletions of nodes could get even more interesting.
>
> If you want to modify the DOM structures and then perform an XPath
> expression and continue, I've found it best to build and modify the
> document using straight Xerces calls, wrap in Xalan when I want to do
> XPath and then map back to Xerces and continue. If I need to do another
> XPath - I re-map to ensure any changes I have done are caught.
>
> Cheers,
> Berin
>
> Russell C. Hadley wrote:
>
> >Hi David,
> > Unsing the Xerces DOM all the function calls new complete but the
> >nodes returned from create element don't seem to be well formed (can't
> >be dumped with my dumper routine like everything else could) and none
> >of the updates appear in the output tree generated by the FormaterToXML
> >and FormatterTreeWalker.
> >
> >My initialization goes like this:
> >
> >// snip...
> >
> >XalanSourceTreeInit theSourceTreeInit;
> >XercesDOMSupport theDOMSupport;
> >
> >XercesParserLiaison theLiaison(theDOMSupport);
> >
> >XalanDocument *theDocument;
> >const LocalFileInputSource *theInputSource;
> >
> >XPathEvaluator theEvaluator;
> >
> >XalanNode* pTheContextNode;
> >
> >XMLPlatformUtils::Initialize();
> >
> >XPathEvaluator::initialize();
> >
> >pTheInputSource = new LocalFileInputSource(
> > c_wstr(XalanDOMString(filename.c_str())));
> >
> >// Parse the document...
> >theDocument =
> > theLiaison.parseXMLStream(*pTheInputSource);
> >
> >
> >// OK, let's find the context node...
> >pTheContextNode =
> > theEvaluator.selectSingleNode(
> > theDOMSupport,
> > theDocument,
> > XalanDOMString("/blah").c_str(),
> > theDocument->getDocumentElement());
> >
> >
> >Then I go on to create elements through the DOM document interface but
> >the nodes don't look bonafide and no changes seem to update in the DOM
> >when it's output by the Formatter. (the number of children of a given
> >node change though they can't be printed.)
> >
> >Any clue would be greatly appreciated. Or a pointer to a sample that
> >programattically adds nodes to an existant xerces DOM. (something
> >that uses createElement and appendChild) The cases I've been able to
> >track down through google (in java) arn't giving me a clue as to what
> >wires could be crossed.
> >
> >Thanks.
> >
> >-R
> >
> >David N Bertoni/Cambridge/IBM writes:
> > >
> > >
> > >
> > >
> > > Hi Russell,
> > >
> > > > David,
> > > > One more thing. Can't seem to find the
> > > TransformToXercesDOM
> > > > sample (In either the Xerces or Xalan trees). Am I looking in the
> > > > right place? (or tree?) Thanks again. -R
> > >
> > > You need the latest sources from CVS. If you've been getting your
> > > sources
> > > from the CVS repository, you should make sure you use the -d option when
> > > you update. If you're using a CVS tarball, get a new one.
> > >
> > > Dave
> >
> >
> >
> >
>
