RE: [JXPath] and Collections

[Matt Benson <gu...@yahoo.com>]

--- Jeffrey Puro <jp...@sterlingtesting.com> wrote:

> If I change this to a List, how do I set an element
> on it or add one to
> it?  
> 
> context.setValue("myList/", "New object on list");
> 
> Do I have to specify a particular index or can
> setValue just add on its
> own?

You have to specify the index.  And unfortunately it
seems JXPath isn't smart enough to be able to take an
expression as an index.  Here's what I had to do here:

//given MyBean { List getList(){...} void
setList(List)}:

        MyBean myBean = new MyBean();
        myBean.getList().add("foo");
        JXPathContext context =
JXPathContext.newContext(myBean);
        context.setFactory(new AbstractFactory() {
            public boolean createObject(JXPathContext
context, Pointer pointer,
                    Object parent, String name, int
index) {
                if (pointer instanceof
PropertyPointer) {
                    Object baseValue =
((PropertyPointer) pointer).getBaseValue();
                    if (baseValue instanceof List) {
                        List list = (List) baseValue;
                        while (index >= list.size()) {
                            list.add(null);
                        }
                        return true;
                    }
                }
                return false;
            }
        });
        int listSize = ((Integer)
context.getValue("size(/list)")).intValue();
        context.createPathAndSetValue("/list[" +
(listSize + 1) + "]", "bar");

HTH,
Matt

> 
> Thanks,
> 
> Jeff
> 
> -----Original Message-----
> From: Matt Benson [mailto:gudnabrsam@yahoo.com] 
> Sent: Wednesday, February 06, 2008 3:55 PM
> To: Jakarta Commons Users List
> Subject: Re: JXPath and Collections
> 
> 
> --- Jeffrey Puro <jp...@sterlingtesting.com> wrote:
> 
> > I have a pojo that has the following properties:
> > 
> 
> Looks like a set is unsupported.  :(  Could you
> possibly use some kind of wrapper object, possibly
> returning asList() from a commons-collections
> ListOrderedSet from a getSetAsList() method or
> something similar?  JXPath can add an element to a
> list.
> 
> -Matt
> 
> >  
> > 
> > Class MyPojo {
> > 
> >  
> > 
> >             private Set mySet;
> > 
> >  
> > 
> > }
> > 
> >  
> > 
> > Using JXPath, I am trying to add a new object to
> my
> > Set object called
> > mySet by using an expression as follows:
> > 
> >  
> > 
> > context.setValue("mySet/", "New object on set");
> > 
> >  
> > 
> > However, this does not work when attempting to add
> > elements to a
> > collection (as it's trying to replace the Set
> object
> > with my new
> > String).  I'm not sure how one would do this with
> > the setValue method,
> > but any help would be appreciated.
> > 
> >  
> > 
> > Regards,
> > 
> >  
> > 
> > Jeff
> > 
> > 
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> 
>  
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