[news.eclipse.tools] Re: pb building TreeView

["Knut Radloff" <knut_radloff@xxxxxxx>]

I just noticed that you initialize your children array (elnts) to a fixed size. The array you return must only have enough slots for
all the children and no extra null slots. That's probably what's causing the exception.
You need to size it to getChildNodes().getLength(). If you have no children an empty array will be returned.

Knut
"anthony saucet" <anthony.saucet@xxxxxxxxxxx> wrote in message news:b8bjer$6na$1@xxxxxxxxxxxxxxxx
> getChildNodes() is not null BUT getChildNodes().getLength() = 0 !!!
> I've printed out what happens in class contentProvider:
>
> getChildNodes: !null
> j: 0                             /* getChildNodes().getLength() */
> contentPovider getChildren end   /* end of method getChildren() */
> hasChild                         /* call method hasChild */
> contentPovider getChildren       /* calls method getChildren() */
>
> and when tries j = getChildNodes().getLength(), stops here and after lot
> of things I didn't catch, exception.
> anthony
>
>
> Knut Radloff wrote:
>
> > Does getChildNodes return null when there are no more children? You can set
> an exception breakpoint in the debugger and find
> > out.where the exception is occurring.
>
> > Knut
>
> > PS: Please continue the thread on eclipse.platform, eclipse.tools should no
> longer be used and will be made read-only soon.
>
> > "anthony saucet" <anthony.saucet@xxxxxxxxxxx> wrote in message
> news:b8bbcv$u1r$1@xxxxxxxxxxxxxxxx
> > > I'm trying to build a TreeView in my perspective to have a look on a DOM
> > > tree built in memory.
> > > I've implemented the TreeView with new TreeViewer, called
> > > setContentProvider() and setLabelProvider(). setInput() gets the
> > > rootElement of my DOM tree. Then in class contentProvider, the tree is
> > > being built by getChildren(), and everything seems ok.
> > > here's the code to get the children:
> > >
> > >    public Object[] getChildren(Object element) {
> > > Object elnts[]=new Object[20];
> > > int i = 0;
> > > int j=((Element)element).getChildNodes().getLength();
> > >
> > > for(Node child = ((Element)element).getFirstChild(); i<j;
> > > ((Element)element).getNextSibling()){
> > > elnts[i]=((Element)element).getChildNodes().item(i);
> > > i++;
> > > }
> > > return elnts;
> > >    }
> > >
> > > I don't really know what happens BUT when it arrives at the end, when no
> > > more child or items, it tries to continue and to create the tree and the
> > > following message appears:
> > > "Unable to create part: Tree" from
> > > eclipse.core.internal.runtime.InternalPlatform
> > > and the exception: "nullPointerException".
> > >
> > > Does anybody have an idea of what I need to do, or what I missed ?
> > > many thx
> > >
>
>
>
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