From: "Thomas DeWeese"
I'm currently using a Tomcat servlet to transform an uploaded SVG document. Once the document is transformed, I generate a PNG preview with Batik and then insert that image into the transformed document as a base64 encoding image; however, my preview image is always blank.
[snip]
The problem almost certainly has to do with the base url of the document. If you transcode from a stream it doesn't have one (unless you provide one to the input stream). You can also provide an xml:base attribute to set the base to resolve URL's against.
> ).createSVGDocument( > "http://localhost:8080/uploadTest/";, > new StringReader( some_string_here ) > );
Actually it looks like you are providing a base so scratch this...
Are you sure you aren't getting error messages of any sort?
AFAIK, I'm catching all exceptions and none of them are firing and the transformed document is generated correctly, minus the blank preview.
Not all errors are communicated using exceptions. Non-fatal errors are sent to the Transcoders ErrorHandler. By default it writes these to System.err - in Tomcat this probably goes to some error log or something... You could provide your own ErrorHandler that always threw an exception.
What's confusing me is that if I build the SVGDocument from the uploaded file (which is a string), I get a preview, but when I build from the results of the XSLT transform (again a string), I don't. I generate the SVGDocument with the exact same call (except for the string parameter, of course):
SVGDocument svgDocument = new SAXSVGDocumentFactory( XMLResourceDescriptor.getXMLParserClassName()
You could see what happens with a 'null' XSL transformation (still probably mucks with doc types etc). Can you provide sample 'transformed' content? Also you might try printing/dumping the output of 'toString' on a bunch of the DOM nodes in this SVGDocument - you should get things like: batik.dom.svg.SVGOMSVGElement, batik.dom.svg.SVGOMGElement, batik.dom.svg.SVGOMPathElement, ... if instead you get batik.dom.GenericElement then you definately have a namespace/config issue.
I'm not doubting your suggestion...I'm just trying to understand what I'm doing wrong.
FWIW, I am serializing the transformed and then reparsing to create a
new
SVG document. My understanding from the code in Squiggle is that I have to do this.
Pretty much, what you really need is for Xalan to create the output document using our DOM implementation. You might find it faster to deep clone the DOM into our implementation rather than serialize and parse.
Do you by any chance know of an example showing this that I can look at? This is my first real foray into Java+XML and embarrassingly, I'm feeling a little lost at this point.
Actually the latest version of the transcoders (I think in 1.5 but it might have happened shortly there after) will do this for you. So you could look at 'batik.transcoder.SVGAbstractTranscoder.java:206' from viewCVS. You could try it but for now I would stick with the parsing route.
Thanks for the help, Kevin KevLinDev - http://www.kevlindev.com
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