XOM API for Processing XML with Java

[luca <passani AT eunet.no>]

Elliotte Harold wrote:

> You're proposed solution seems correct. But it may be easier to just not 
> to override makeAttribute at all. It might be slower, but it might not 
> be noticeable. It would certainly be simpler

well, this has to go into a Servlet filter which parses each response
from a JSP page (or whatever else), so avoiding
the traversal of the tree when all I need is to collect the
image URLs is highly desirable....or maybe I misunderstood what
you were trying to say?
So far, I am testing the single pieces one by one.

here is the subclass of NodeFactory that makes me retrieve
the URLs:


class StreamingImgLister extends NodeFactory{

    private int depth = 0;
    private Nodes empty = new Nodes();
    public ArrayList urls = new ArrayList(20);

    // We don't need the comments.
    public Nodes makeComment(String data) {
        return empty;
    }

    // We don't need text nodes at all
    public Nodes makeText(String data) {
        return empty;
    }

    public Element startMakingElement(String name, String namespace) {
        //add to Elem List
        //if (name.equals("img") ) {
        //    urls.add(name);
        //}
        return new Element(name, namespace);
    }

    public Nodes finishMakingElement(Element element) {

        if (element.getLocalName().equals("img")) {
            System.out.println(element.toXML());
            if (element.getAttributeValue("src") != null) {
                urls.add(element.getAttributeValue("src"));
            }
        }
        if (element.getParent() instanceof Document) {
            return new Nodes(element);
        }
        else return empty;
    }

    public Nodes makeAttribute(String name, String URI,
                               String value, Attribute.Type type) {
        if (name.equals("src") ) {    
            return new Nodes(new Attribute(name, URI, value, type));
        }
        return empty;
    }

    public Nodes makeDocType(String rootElementName,
                             String publicID, String systemID) {
        return empty;
    }

    public Nodes makeProcessingInstruction(
                                           String target, String data) {
        return empty;
    }

}


BTW, is there a way for XOM to retrieve a picture through
HTTP and save it into some binary buffer?
a previous msg of yours seemed to imply this...

Luca