[Biojava-dev] Re: StAX questions

[Michael L. Heuer]

Ok.  I've found two ways to do this, one using a nested class

class ParentHandler ...
{
  private List children;
  private ChildHandler childHandler = new ChildHandler();

  public void startTree(..) { children = new ArrayList(); }
  public void startElement(...)
  {
    if ("child".equals(qName))
      dctx.delegate(childHandler);
  }

  private class ChildHandler ...
  {
    private Child child;

    public void startTree(..) { child = new Child(); }
    public void endTree(..) { children.add(child);  return child; }
    public void startElement(...)
    {
      child.setName(...attr.getValue();...);
    }
  }
}

the other as two classes at the same level

class ParentHandler ...
{
  private List children;
  private ChildHandler childHandler = new ChildHandler();

  public void startTree(..) { children = new ArrayList(); }
  public void startElement(...)
  {
    if ("child".equals(qName))
      dctx.delegate(childHandler);
  }
  public void endElement(..., Object dResult, ...)
  {
    Child child = (Child) dResult;
    children.add(child);
  }
}
class ChildHandler ...
{
  private Child child;

  public void startTree(..) { child = new Child(); }
  public void endTree(..) { return child; }
  public void startElement(...)
  {
    child.setName(...attr.getValue();...);
  }
}

   michael


On Tue, 26 Nov 2002, Michael L. Heuer wrote:

> Hello,
>
> Two more questions about StAX,
>
> 1.  would it be possible to make DispatchOnElement.ByQName and friends
> non-final?  I end up duplicating the funcationality of DispatchOnElement
> in subclasses of StAXContentHandlerBase just because I need to parse
> attributes, for instance.
>
> 2.  when you return an object from public void endTree(StAXContext ctx),
> where does it go?  I've used StAX on several occassions now and always
> have this feeling like I'd have to type a lot less if I fully understood
> what was going on.
>
> given
>
> <parent>
>   <children>
>     <child name="child0" />
>     <child name="child1" />
>   </children>
> </parent>
>
> one has something like
>
> class ParentHandler ...
> {
>   private List children;
>   private ChildHandler childHandler = new ChildHandler();
>
>   public void startTree(..) { children = new ArrayList(); }
>   public void startElement(...)
>   {
>     if ("child".equals(qName))
>       dctx.delegate(childHandler);
>   }
>
>   private class ChildHandler ...
>   {
>     private Child child;
>
>     public void startTree(..) { child = new Child(); }
>     public void endTree(..) { return child; }
>     public void startElement(...)
>     {
>       child.setName(...attr.getValue...);
>     }
>   }
> }
>
> where's the best place to add child to the children list in ParentHandler?
>
> Maybe I'd like to see something like
>
> public void startElement(...)
> {
>   if ("child".equals(qName))
>   {
>     children.add( (Child) dctx.delegate(childHandler) );
>   }
> }
>
> Thank you in advance,
>
>    michael
>
> _______________________________________________
> biojava-dev mailing list
> biojava-dev@biojava.org
> http://biojava.org/mailman/listinfo/biojava-dev
>