Hi Harry. Harry Kao: > I'm trying to embed a stylesheet into an SVG document but the sample > code isn't working for me: > > http://xmlgraphics.apache.org/batik/using/svg-generator.html#Customizing+the+generated+SVG+style > > If I do this: > > org.w3c.dom.Document svgDoc = > GenericDOMImplementation.getDOMImplementation() > .createDocument("http://www.w3.org/2000/svg";, "svg", null); > System.out.println("el: " + svgDoc.getDocumentElement()); > System.out.println("ns: " + svgDoc.getDocumentElement().getNamespaceURI()); > System.out.println("name: " + svgDoc.getDocumentElement().getNodeName()); > SVGSVGElement s = (SVGSVGElement)svgDoc.getDocumentElement(); > > I get the following output: > > el: org.apache.batik.dom.genericelemen...@1ac88440 > ns: http://www.w3.org/2000/svg > name: svg > Exception in thread "main" java.lang.ClassCastException: > org.apache.batik.dom.GenericElementNS cannot be cast to > org.w3c.dom.svg.SVGSVGElement > at ReportRenderer.main(ReportRenderer.java:120) > > Is there an obvious reason why this cast is failing?
It fails because the kind of document that is created from the GenericDOMImplementation isn’t an SVGDocument, it’s a GenericDocument. If all you need to do to the generated document is to manipulate its tree a bit and then say serialize it, and not do any SVG DOM specific stuff, then that’s fine; it just means that the document element will be of class GenericElementNS rather than something that implements the SVGSVGElement interface. (A GenericDocument might be ever so slightly lighter weight than an SVGDocument. I wouldn’t think it’s an appreciable different, though.) If you do need to do some SVG DOM specific stuff on the document (e.g. you want to build its corresponding graphics tree so that you can call getBoundingBox() on some elements) then you need to use the SVGDOMImplementation rather than the GenericDOMImplementation. That DOMImplementation will create an SVGDocument whose root element will implement SVGSVGElement. -- Cameron McCormack ≝ http://mcc.id.au/ --------------------------------------------------------------------- To unsubscribe, e-mail: batik-users-unsubscr...@xmlgraphics.apache.org For additional commands, e-mail: batik-users-h...@xmlgraphics.apache.org
