XOM API for Processing XML with Java

[luca <passani AT eunet.no>]

Elliotte Harold wrote:

> Do you really want to traverse it? Why not just build the document 
> without comments by using a custom node factory that never includes 
> comments in the first place?

I have done this already (code at the end for the record).
My problem is that I am acting on an already-parsed WURFL.xml.
My understanding is that parsing from scratch wouldn't help
me much. Not only do I need to remove the comments (that's
second priority actually), but I need to remove all the capabilities
that are not in a given list and, in addition, I need to make sure that
there are no empty groups left.

The whole idea is to have a filter that lets people create
a mini-wurfl containing only capabilities relevant for that user.
Here is the first prototype:

http://demo.openwave.com:8080/wurfltests/wurflfilter.jsp

Luca

    public String filterCapabilities(HashSet capaAcceptedList) {

        if (wurflDocument == null) {
            return "";
        }
        Document tmpWurflDocument = (Document) wurflDocument.copy();
        //cleaning. remove version element
        Element version = 
tmpWurflDocument.getRootElement().getFirstChildElement("version");
        if (version != null) 
{tmpWurflDocument.getRootElement().removeChild(version);}


        Element devices_elem = 
tmpWurflDocument.getRootElement().getFirstChildElement("devices");

        //more cleaning. remove all comments
        for (int h = 0; h < devices_elem.getChildCount(); h++) {
            Node child = devices_elem.getChild(h);
            if (child instanceof Comment) {
                devices_elem.removeChild(child);
            }
        }

        Elements devices = devices_elem.getChildElements("device");
        int numberOfDevices = devices.size();

        for(int k = 0; k < devices.size(); k++) {
            Element device = devices.get(k);
            //some cleaning. remove all comments
            for (int h = 0; h < device.getChildCount(); h++) {
               Node child = device.getChild(h);
               if (child instanceof Comment) {
                   device.removeChild(child);
               }
            }
            Elements groups = device.getChildElements("group");

            //extra list to keep capabilities grouped by group
            for (int i = 0; i < groups.size(); i++) {
                Element group = groups.get(i);

                //some cleaning. remove all comments
                for (int h = 0; h < group.getChildCount(); h++) {
                    Node child = group.getChild(h);
                    if (child instanceof Comment) {
                        group.removeChild(child);
                    }
                }
                Elements capaList = group.getChildElements("capability");
                for (int j = 0; j < capaList.size(); j++) {
                    Element capa = capaList.get(j);
                    String capa_name = capa.getAttributeValue("name");
                    if (!capaAcceptedList.contains(capa_name)) {
                        //remove capability
                        group.removeChild(capa);
                    }
                }
                //if group has no capability, remove group too
                if (0 == group.getChildElements("capability").size()) {
                    device.removeChild(group);
                }
            }
        }
        try {
            return toPrettyXML(tmpWurflDocument);
        } catch (Exception e) {
            return "Error producing filtered WURFL:"+e.getMessage();
        }
    }