[jdom-interest] Problem with Jdom8 - getChildren() on root do esn't work...

[Beleznay, Dave]

Hi Bradley,


Unfortunately I think i'm having the EJB Serialization problem as well.
(didn't notice that thread before) so I can't really test (in my
debugger rootElement.getChildren() is always returning an empty list),
but I've still got a couple of questions for how it *should* be working,
as I'm not sure i'm reading you correctly...


> // get a 'live' list of rootElement's content, by 'live' we mean
changes
> // it, also show in rootElement and any other 'live' list obtained
from
> // a call to getChildren or getContent on the same element.
getChildren
> // returns a view of the Elements content where only objects of type
> // Element are visiable. Since it is live however,
children.add(someElement)
> // produces the same result as rootElement(someElement). 
> List children = rootElement.getChildren();

if I were to do a children.add(someElement) that's the same as
rootElement(someElement)?  do you mean
rootElement.addContent(someElement) ?

If I were to write the code the same way :

                List children = rootElement.getChildren();
// rootElement.removeChildren();
                ListIterator i = children.listIterator();
                
                while (i.hasNext()) {
                    Element ele = (Element) i.next();
                    String eleName = ele.getName();
                    if (eleName.equals("role")) {
                        i.next();    
                        i.add(roleDesigner);
                    }
                }
                rootElement.setChildren(children);                

only removing the line to removeChildren(),  then the last call to
setChildren is basically doing nothing?


Or should I be creating a new ArrayList and playing with that, as was
suggested?

children = new ArrayList(rootElement.getChildren());


Cheers,

Dave
-------
David Beleznay
Software Engineer
WebCT 

> -----Original Message-----
> From: Bradley S. Huffman [mailto:hip at a.cs.okstate.edu]
> Sent: Monday, April 08, 2002 12:29 PM
> To: Beleznay, Dave
> Cc: jdom-interest at jdom.org
> Subject: Re: [jdom-interest] Problem with Jdom8 - 
> getChildren() on root
> do esn't work... 
> 
> 
> "Beleznay, Dave" writes:
> 
> > Did this ever get resolved?
> 
> The part about EJB and a possible serialization problem? Not yet.
> 
> > I seem to be having the same problem when
> > I'm trying getChildren() on the root element.
> > the List children contains no elements after the assignment. 
> 
> He's you code annotated with with what the current design
> should produce and why.
> 
> // get a 'live' list of rootElement's content, by 'live' we mean
changes
> // it, also show in rootElement and any other 'live' list obtained
from
> // a call to getChildren or getContent on the same element.
getChildren
> // returns a view of the Elements content where only objects of type
> // Element are visiable. Since it is live however,
children.add(someElement)
> // produces the same result as rootElement(someElement). 
> List children = rootElement.getChildren();
> 
> // removes all Element children from rootElement, which means 
> all items are
> // also removed from List children, rootElement may still 
> have content it
> // just won't be a instanceof Element.
> rootElement.removeChildren();
> 
> // this produces a iterator where hasNext() initially will 
> return false
> // since children is empty
> ListIterator i = children.listIterator();
> 
> // hasNext() is false so the loop is never executed
> while (i.hasNext()) {
>     Element ele = (Element) i.next();
>     String eleName = ele.getName();
>     if (eleName.equals("role")) {
>         i.next();   // I assume this is a typo, otherwise you 
> have 2 next()
>                     // in a row without a corresponding hasNext() 
>         i.add(roleDesigner);
>     }
> }
> 
> // children is empty so this does nothing
> rootElement.setChildren(children);
> 
> Little long winded but there seems to be some confussion 
> caused by having
> all Lists 'live', guess we need to improve the docs.
> 
> Brad
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