G'day Folks,
Popping my head out of the woodwork here to ask a few questions about
the Batik implementation, and to point out a bug or two. This one is a
bug report, advice request to follow in the next email....
The bug: - The GVTBuilder crashes if I pass the code a Document instance
created by the default JAXP parser. The code in GraphicsNode assumes
that you will be getting a DOM Document that happens to support the
Views extension. This is not always the case - we use our own custom DOM
builder (we're creating DOM Level3 documents and providing our own DOM
implementation). The crash we get is this line:
public GraphicsNode build(BridgeContext ctx, Document document) {
// set the media type
AbstractViewCSS view;
view = (AbstractViewCSS)((DocumentView)document).getDefaultView();
System - JDK 1.4.0FCS, Batik 1.1.1 binary download.
I'm finding that the Batik code is making a hell of a lot of assumptions
about who generated the DOM instance for it. In general, the testing
looks like you've only assumed that you're using the Apache DOM
implementation (probably crimson by the looks of the included download
JARs). The code should be more rigid by first checking what capabilities
the Document has that is being passed to you. ie, You need to insert at
least these lines:
DOMImplementation impl = document.getImplementation();
if(impl.hasFeature("views", null)) {
AbstractViewCSS view;
view = (AbstractViewCSS)((DocumentView)document).getDefaultView();
....
}
Either that, or state up front in the documentation that the generator
of the document must support XYZ features for it to be usable with Batik.
--
Justin Couch http://www.vlc.com.au/~justin/
Java Architect & Bit Twiddler http://www.yumetech.com/
Author, Java 3D FAQ Maintainer http://www.j3d.org/
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"Humanism is dead. Animals think, feel; so do machines now.
Neither man nor woman is the measure of all things. Every organism
processes data according to its domain, its environment; you, with
all your brains, would be useless in a mouse's universe..."
- Greg Bear, Slant
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