Thanks Georg,
That's great. I was doing something a bit similar however I did not use the
sax result to get a node of the DOM tree and traverse using XPath.
I am not sure this will be efficient enough for me as I need to traverse,
modify and then render various nodes repeatedly in a very short space of
time. I was keen to find a method that would allow me to alter and
reevaluate a fragment of the area tree (rerendering that part of the AT
using FOP without wasting time, rendering the rest).
So I don't suppose anyone knows a way to handle, manipulate and re-render a
fragment of the area tree using FOP?
I will keep experimenting in the meantime!
Cheers,
Tom
Georg Datterl wrote:
>
> Hi Tom,
>
> I get the area tree using
>
> FOUserAgent foUserAgent = getFopFactory().newFOUserAgent();
> Transformer transformer =
> getMultipassFactory().newTransformer();
> TransformerHandler handler =
> getMultipassFactory().newTransformerHandler();
> DOMResult domResult = new DOMResult();
> handler.setResult(domResult);
>
> org.apache.fop.render.Renderer targetRenderer =
> foUserAgent.getRendererFactory().createRenderer(
> foUserAgent, MimeConstants.MIME_PDF);
>
> XMLRenderer renderer = new XMLRenderer();
> renderer.mimicRenderer(targetRenderer);
> renderer.setContentHandler(handler);
> renderer.setUserAgent(foUserAgent);
>
> foUserAgent.setRendererOverride(renderer);
>
> Fop fop =
> getFopFactory().newFop(MimeConstants.MIME_FOP_AREA_TREE, foUserAgent);
> Result res = new SAXResult(fop.getDefaultHandler());
> transformer.transform(source, res);
> org.w3c.dom.Document doc = domResult.getNode();
>
> Then I get values from the tree through Xpath
>
> XPathFactory factory=XPathFactory.newInstance();
> XPath xPath=factory.newXPath();
> NodeList nl =
> (NodeList)xPath.evaluate("//blo...@prod-id='"+DT_TAG+id+"']", doc,
> XPathConstants.NODESET);
> xPath.evaluate(".//blo...@prod-id='"+L1_TAG+id+"']/@bpd",
> nl.item(i),
> XPathConstants.NUMBER)
>
> The blocks I'm interested in have well-known ids and I'm interested in
> more than one information below the node with id DT_TAGxx, that's why I
> use a nodelist. When you find a smarter way to get the information, please
> tell me, cause this xpath solution is not very fast in large documents...
>
> Regards,
>
> Georg Datterl
>
> ------ Kontakt ------
>
> Georg Datterl
>
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> -----Ursprüngliche Nachricht-----
> Von: TomWilcox [mailto:[email protected]]
> Gesendet: Freitag, 10. Juli 2009 18:52
> An: [email protected]
> Betreff: Area Tree Handling
>
>
> Hi,
>
> First of all, I am a FOP dummy. I can make PDFs from FO but I don't know
> about the inner workings.
>
> I have FOP 0.95 embedded in my Java application. I would like to construct
> an FO document and modify/examine the AreaTree for it on the fly.
>
> This is in an attempt to fill blocks (of set size and position) on a page
> with text/graphics and until the areatree info shows that block is full.
>
> I would like to do this as fast as possible and I thought this would imply
> the best route is to get hold of the areatree object in my application and
> modify/access the objects of interest. (Or, failing that, to get hold area
> tree xml fragments maybe)..
>
> Can anyone tell me how I might go about achieving this?
>
> Or even better, can anyone point me in the direction of any good
> tutorials/examples that show Java code using embedded FOP to generate an
> area tree object for an FO stream/file and then modify it with code..?
>
> That would be awesome :)
>
> Thanks in advance,
> Tom
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