[jdom-interest] How to get nextSibling, prevSibling, firstChild and lastChild in JDOM?

[Meghasyam Bokam]

Thank You Harry.

Is there any possibility of having two elements with the same
content and everything in the xml file, then the List.indexOf(Object o)
returns the first element in the tree. I don't know whether the parser
removes the redundant elements when it parses the xml file.

Meghasyam.

On Tue, 17 Sep 2002, Harry Evans wrote:

> It is a bit more roundabout but:
>
> //myElement is the <Element> element in your example
> //List implementation:
> Element parent = myElement.getParent();
> List children = parent.getChildren();
> int myIndex = children.indexOf(myElement);
> //get prevSibling
> if(myIndex > 0 && myIndex < children.size()) {
>   Element prevElement = (Element)children.get(myIndex - 1);
> }
> //get nextSibling
> if(myIndex >= 0 && myIndex < children.size() - 1) {
>   Element nextElement = (Element)children.get(myIndex + 1);
> }
>
> //Iterator implementation
> ListIterator iterator = myElement.getParent().getChildren().listIterator();
> boolean done = false;
> while(iterator.hasNext() && !done) {
>   Element element = (Element)iterator.next();
>   if(myElement.equals(element) {
>     done = true;
>   }
> }
> if(!done) {
>   //error
> } else {
>   //get prevSibling
>   if(iterator.hasPrevious()) {
>     Element prevElement = (Element)iterator.previous();
>     iterator.next(); //put it back on myElement
>   }
>   //get nextSibling
>   if(iterator.hasNext()) {
>     Element nextElement = (Element)iterator.next();
>     iterator.previous(); //put it back on myElement
> }
>
> In my experience, usually getting next sibling and previous siblings is
> done, at least in my experience, in the context of looking at all the
> siblings, though your usage may vary.
>
> Anyone else have a more elegant solution?
>
> Harry
>
> > -----Original Message-----
> > From: Meghasyam Bokam [mailto:mbokam at cs.nmsu.edu]
> > Sent: Tuesday, September 17, 2002 4:59 PM
> > To: Harry Evans
> > Subject: RE: [jdom-interest] How to get nextSibling, prevSibling,
> > firstChild and lastChild in JDOM?
> >
> >
> > Thank You Harry. I understood getting the first and last child of an
> > element. But I will explain what I mean by siblings.
> >
> > <?xml version="1.0"?>
> > <root>
> >    <prevSibling>
> >    	text
> >    </prevSibling>
> >    <Element>
> > 	<child1> text </child1>
> > 	<child2> text </child2>
> >    </Element>
> >    <nextSibling>
> > 	text
> >    </nextSibling>
> > </root>
> >
> > Now if I am processing at "Element" , how to get the "nextSibling" and
> > "prevSibling" elements, considering only I have "Element" at my hand.
> >
> > Thank You.
> >
> > Meghasyam.
> >
> >
> > On Mon, 16 Sep 2002, Harry Evans wrote:
> >
> > > You can access the children of any element as a standard
> > java.util.List by
> > > just calling getChildren() on the Element.  Some examples
> > of how you could
> > > get what you are asking for:
> > >
> > > xml:
> > > <?xml version="1.0"?>
> > > <root>
> > >   <child>1</child>
> > >   <child>2</child>
> > >   <child>3</child>
> > >   <child>4</child>
> > >   <child>5</child>
> > > </root>
> > >
> > > java code:
> > > List children = myElement.getChildren();
> > > //first child element
> > > Element firstElement = (Element)children.get(0);
> > > //last child element
> > > Element lastElement = (Element)children.get(children.size() - 1);
> > > Element arbitraryElement = (Element)children.get(3);
> > > int currentIndex = children.indexOf(arbitraryElement);
> > > if(currentIndex >= 0 && currentIndex < children.size() + 1) {
> > > //sibling after arbitrary element
> > > 	Element nextElement = children.get(currentIndex + 1);
> > > }
> > >
> > > You could also just use an iterator, as the List returned
> > by getChildren()
> > > is a standard java.util.List.
> > >
> > > Harry
> > >
> > > > -----Original Message-----
> > > > From: jdom-interest-admin at jdom.org
> > > > [mailto:jdom-interest-admin at jdom.org]On Behalf Of Meghasyam Bokam
> > > > Sent: Monday, September 16, 2002 5:21 PM
> > > > To: jdom-interest at jdom.org
> > > > Subject: [jdom-interest] How to get nextSibling, prevSibling,
> > > > firstChild
> > > > and lastChild in JDOM?
> > > >
> > > >
> > > > Hi all,
> > > >
> > > >     I am new to JDOM, and I see there are no methods to get
> > > > nextSibling,
> > > > prevSibling, firstChild and lastChild of an ELEMENT. Can
> > > > anybody help me
> > > > to write those specific methods which I can use in my application.
> > > >
> > > > Thanks for the help.
> > > >
> > > > Meghasyam.
> > > >
> > > >
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> >
>