Re: How can I sort elements by an attribute value?

Hi,

you can just define a comparator that compares elements by their attribute
value, like

public class ElementAttributeComparator implements Comparator<Element> {

    public int compare(Element e1, Element e2) {

        String href1 = e1.getAtttibuteValue("href");
        String href2 = e2.getAttributeValue("href");

        if (href1 == null) {
            if (href2 == null) return 0;
            else return -1;
        }
        else {
             if (href2 == null) return 1;
             else return hef1.compareTo(href2);
        }

    }

}
(something may be wrong, writing from memory)


and use it as parameter 'c' in sortElments

Best Regards,
Grzegorz

2008/3/1, msook <[email protected]>:
>
>
> Hello,
> I'm pretty new in JDOM world, and I've got very excited project that I am
> really interested in.
>
> The xml file looks like
> <resources>
> <resource type="webcontent" identifier="acb-123"
> href="aaa/bbb263.xhtml">
> <file href="aaa/bbb263.xhtml" />
> </resource>
> <resource type="webcontent" identifier="sbs-345"
> href="aaa/ccc264.xhtml">
> <file href="aaa/ccc264.xhtml" />
> </resource>
> <resource type="quiz" identifier="ccc-222"
> href="aaa/bbb159.xml">
> <file href="aaa/ccc159.xml" />
> </resource>
> <resource type="quiz" identifier="ddd-123"
> href="aaa/ddd170.xml">
> <file href="aaa/ddd170.xml" />
> </resource>
> </resources>
>
> And as you guess, there is a node called "resources" and under that node,
> each resource's attribute href value is added(showing).
> But I need to fix it to show that under "resources" node(parent), each
> resouce should be shown by href's alphabetical order.
>
> I've read the codes example regarding "Sorting elements in a document
> by a Node" and this is it.
>
> public static void sortElements(Element parent, Comparator c) {
> // Create a new, static list of child elements, and sort it.
> List children = new ArrayList(parent.getChildren());
> Collections.sort(children, c);
> ListIterator childrenIter = children.listIterator();
>
> // Create a new, static list of all content items.
> List content = new ArrayList(parent.getContent());
> ListIterator contentIter = content.listIterator();
>
> // Loop through the content items, and whenever we find an Element,
> // we'll insert the next ordered Element in its place. Because the
> // content list is not live, it won't complain about an Element
> being
> // added twice.
> while(contentIter.hasNext())
> {
> Object obj = contentIter.next();
> if (obj instanceof Element)
> contentIter.set(childrenIter.next());
> }
>
> // Finally, we set the content list back into the parent Element.
> parent.setContent(null);
> parent.setContent(content);
> }
>
> But how can I sort elements by attribute?
> Please share the code example if you have.
>
> Thanks in advance.
>
> --
> View this message in context:
> http://www.nabble.com/How-can-I-sort-elements-by-an-attribute-value--tp15773258p15773258.html
> Sent from the JDOM - General mailing list archive at Nabble.com.
>
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