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Date: Mon, 23 Feb 2009 12:49:13 -0800 (PST)
From: Matt Benson <gudnabrsam@yahoo.com>
Subject: Re: JXPath over Generic Collection<?>, How?
To: Commons Users List <user@commons.apache.org>
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Andrew:
  I still don't have tons of time, but I did use your original code to see =
what I could see to start with.  Firstly, you blow away TIGER-TWO in your e=
xample code by repeating index 1 when you set TIGER-THREE.  Next, for some =
reason the [@name=3D'foo'] syntax isn't working, but [name=3D'foo'] is work=
ing for me.  I will try to make some time to research the combination of at=
tributes and dynabeans to see if I can tell you why it shouldn't work, or f=
ix it if it turns out that it should in fact work.

HTH,
Matt

--- On Mon, 2/23/09, Matt Benson <gudnabrsam@yahoo.com> wrote:

> From: Matt Benson <gudnabrsam@yahoo.com>
> Subject: Re: JXPath over Generic Collection<?>, How?
> To: "Commons Users List" <user@commons.apache.org>
> Date: Monday, February 23, 2009, 12:27 PM
>=20
> Andrew,
> =A0 I've been meaning to look into this but haven't
> yet.=A0 If you have any ready-to-run code you can send to
> the list, that wouldn't hurt...
>=20
> -Matt
>=20
> --- On Mon, 2/23/09, Andrew Hughes <ahhughes@gmail.com>
> wrote:
>=20
> > From: Andrew Hughes <ahhughes@gmail.com>
> > Subject: Re: JXPath over Generic Collection<?>,
> How?
> > To: "Commons Users List" <user@commons.apache.org>
> > Date: Monday, February 23, 2009, 5:42 AM
> > OK, email #19 to the list. I'm both
> > incredibly patient and skeptical that
> > this will ever work. I might try and run this in a
> debugger
> > and track down
> > "how" JXPath traverses the DynaBean.... but given the
> > reflection involved
> > that might be a painful task.
> > --AH
> >=20
> >=20
> > On Tue, Feb 17, 2009 at 1:11 PM, Andrew Hughes <ahhughes@gmail.com>
> > wrote:
> >=20
> > > Ping... if anyone can help with this JXPath
> &
> > DynaBeans problem I'd be
> > > REALLY THANKFUL :)
> > >
> > >
> > > On Fri, Feb 13, 2009 at 1:55 PM, Andrew Hughes
> <ahhughes@gmail.com>
> > wrote:
> > >
> > >> Howdy,
> > >> I've taken Matt's suggestion onboard and I
> have
> > investigated DynaBeans.
> > >> These look pretty good for all intestive
> purposes
> > and there's a code
> > >> examples below how to build the data
> structure:
> > >>
> > >> + root [@name=3D"ROOT"]
> > >>=A0 =A0=A0=A0+ animal [@name=3D"ANIMAL"]
> > >>=A0 =A0 =A0 =A0=A0=A0+ dog
> > [@name=3D"DOG"]
> > >>=A0 =A0 =A0 =A0 =A0
> > =A0=A0=A0+ boxer [@name=3D"BOXER"]
> > >>=A0 =A0 =A0 =A0 =A0
> > =A0=A0=A0+ labrador [@name=3D"LABRADOR"]
> > >>=A0 =A0 =A0 =A0=A0=A0+ cat
> > [@name=3D"CAT"]
> > >>=A0 =A0 =A0 =A0 =A0
> > =A0=A0=A0+ tiger [@name=3D"TIGER-ONE"]
> > >>=A0 =A0 =A0 =A0 =A0
> > =A0=A0=A0+ tiger [@name=3D"TIGER-TWO"]
> > >>=A0 =A0 =A0 =A0 =A0
> > =A0=A0=A0+ tiger [@name=3D"TIGER-THREE"]
> > >>=A0 =A0 =A0 =A0 =A0
> > =A0=A0=A0+ lion [@name=3D"LION"]
> > >>
> > >>
> > >> And the code looks like...
> > >>
> > >>=A0 LazyDynaBean lazyDynaBean =3D new
> > LazyDynaBean(); //the transparent root.
> > >>=A0 LazyDynaBean root =3D new LazyDynaBean();
> > >> LazyDynaBean animal =3D new LazyDynaBean();
> > >>=A0 LazyDynaBean dog =3D new LazyDynaBean();
> > >> LazyDynaBean cat =3D new LazyDynaBean();
> > >>=A0 LazyDynaBean boxer =3D new LazyDynaBean();
> > >> LazyDynaBean labrador =3D new LazyDynaBean();
> > >>=A0 LazyDynaBean tiger1 =3D new LazyDynaBean();
> > >> LazyDynaBean tiger2 =3D new LazyDynaBean();
> > >>=A0 LazyDynaBean tiger3 =3D new LazyDynaBean();
> > >> LazyDynaBean lion =3D new LazyDynaBean();
> > >>=A0 //set the @name property of each bean,
> user
> > UPPER to make them distinct
> > >> for examples.
> > >> root.set("name","ROOT");
> > >>=A0 animal.set("name","ANIMAL");
> > >> dog.set("name","DOG");
> > >>=A0 cat.set("name","CAT");
> > >> boxer.set("name","BOXER");
> > >>=A0 labrador.set("name","LABRADOR");
> > >> tiger1.set("name","TIGER-ONE");
> > >>=A0 tiger2.set("name","TIGER-TWO");
> > >> tiger3.set("name","TIGER-THREE");
> > >>=A0 lion.set("name","LION");
> > >> //build the bean hierarchy.
> > >>=A0 lazyDynaBean.set("root",0, root);
> > >> root.set("animal",0, animal);
> > >>=A0 animal.set("dog",0,dog);
> > >> animal.set("cat",0,cat);
> > >> dog.set("labrador",0,labrador);
> > >>=A0 dog.set("boxer",0, boxer);
> > >> cat.set("tiger",0,tiger1);//duplicate
> > >>=A0 cat.set("tiger",1,tiger2);//duplicate
> > >> cat.set("tiger",1,tiger3);//duplicate
> > >>=A0 cat.set("lion",0,lion);
> > >>=A0 =A0 =A0
> > =A0=A0=A0JXPathContext context =3D
> > JXPathContext.newContext(lazyDynaBean);
> > >>=A0 =A0 =A0 =A0=A0=A0String query
> > =3D "/root/animal/cat/tiger";
> > >>=A0 =A0 =A0 =A0=A0=A0Object value
> > =3D context.getValue(query);
> > >>
> > >>
> > >> But there's a problem with JXPath querying
> this
> > also. Absolute Paths like
> > >>=A0 '/root/animal/cat/tiger' or
> > '/root/animal/cat/tiger'[2]' work perfectly.
> > >> But I don't have anyluck doing "deep"
> searches.
> > For examples the following
> > >> just won't work.
> > >> '//cat'
> > >> //*[@name=3D'LION']
> > >> /root/animal/cat/tiger[@name=3D'TIGER-TWO']
> > >>
> > >> Things are looking up, but is this behavior
> to be
> > expected?
> > >>
> > >>=A0 Cheers,
> > >> --AH
> > >>
> > >>
> > >> On Thu, Feb 12, 2009 at 6:43 AM, Matt Benson
> > <gudnabrsam@yahoo.com>wrote:
> > >>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> --- On Wed, 2/11/09, Andrew Hughes <ahhughes@gmail.com>
> > wrote:
> > >>>
> > >>> > From: Andrew Hughes <ahhughes@gmail.com>
> > >>> > Subject: Re: JXPath over Generic
> > Collection<?>, How?
> > >>> > To: "Commons Users List" <user@commons.apache.org>
> > >>> > Date: Wednesday, February 11, 2009,
> 4:19
> > AM
> > >>> > Still No Luck, I have removed
> recursive
> > generic collections
> > >>> > and have tried
> > >>> > the following code... this is
> becoming a
> > marathon effort
> > >>> > :'(
> > >>> >
> > >>> > public class Thing {
> > >>> >
> > >>> >=A0 =A0=A0=A0public
> > Thing(String name) {
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0this.name =3D name;
> > >>> >=A0 =A0=A0=A0}
> > >>> >=A0 =A0=A0=A0private String
> > name =3D "";
> > >>> >
> > >>> >=A0 =A0=A0=A0public String
> > getName() {
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0return name;
> > >>> >=A0 =A0=A0=A0}
> > >>> >=A0 =A0=A0=A0private
> > ArrayList<Thing> children =3D new
> > >>> > ArrayList<Thing>();
> > >>> >
> > >>> >=A0 =A0=A0=A0public
> > ArrayList<Thing> getChildren() {
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0return children;
> > >>> >=A0 =A0=A0=A0}
> > >>> >
> > >>> > }
> > >>> >
> > >>> >
> > >>> >=A0 =A0=A0=A0public static
> > void main(String[] args) {
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0//get some same data
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0Thing animal =3D new Thing("Animal");
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0//Animal.Dog.*
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0Thing dog =3D new Thing("Dog");
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0dog.getChildren().add(new
> > >>> > Thing("Labrador"));
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0dog.getChildren().add(new
> > >>> > Thing("Boxer"));
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0animal.getChildren().add(dog);
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0//Animal.Cat.*
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0Thing cat =3D new Thing("Cat");
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0cat.getChildren().add(new Thing("Lion"));
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0cat.getChildren().add(new
> > >>> > Thing("Tiger"));
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0animal.getChildren().add(cat);
> > >>> >
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0//run a query on it
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0JXPathContext context =3D
> > >>> > JXPathContext.newContext(animal);
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0String query =3D "/Animal";
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0Thing result =3D (Thing)
> > context.getValue(query);
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0String path =3D
> > context.getPointer(query).asPath();
> > >>> >=A0 =A0 =A0
> > =A0=A0=A0System.out.println("Ran '" + query +
> > >>> > "' and got '" +
> > >>> > result.getName() + "' on path '" +
> path
> > +
> > >>> > "'.");
> > >>> >=A0 =A0=A0=A0}
> > >>> >
> > >>>
> > >>> What would you be trying to select?=A0 If
> > you want to know how to look for
> > >>> a given Thing in this graph, I can
> probably
> > help.=A0 If you want to know what
> > >>> graph will allow you to use a
> preconceived
> > notion of the xpath you want to
> > >>> use, that will be harder.=A0 You might
> use
> > [beanutils] dynabeans in
> > >>> conjunction with [jxpath] to try and
> achieve
> > the latter.
> > >>>
> > >>> -Matt
> > >>>
> > >>> >
> > >>> >
> > >>> >
> > >>> > On Wed, Feb 11, 2009 at 3:08 PM,
> Andrew
> > Hughes
> > >>> > <ahhughes@gmail.com>
> > wrote:
> > >>> >
> > >>> > > Yeah, that makes sense. The
> part
> > that was confusing me
> > >>> > is that if I
> > >>> > > have...
> > >>> > >
> > >>> > > public class Thing {
> > >>> > >
> > >>> > >=A0 =A0 private
> > List<Thing> children;
> > >>> > >
> > >>> > > }
> > >>> > >
> > >>> > > I was assuming I would need to
> > prefix all of my
> > >>> > expressions "steps" with
> > >>> > > '/children'. From what you
> said
> > earlier this
> > >>> > is not the case as collections
> > >>> > > are "auto traversed/loaded".
> > >>> > >
> > >>> > > Thanks again matt! I won't get
> to
> > test this out
> > >>> > til later tonight be look
> > >>> > > foward to seeing it working!!!
> > >>> > >
> > >>> > > Andrew
> > >>> > >
> > >>> > >
> > >>> > > On Wed, Feb 11, 2009 at 2:57
> PM,
> > Matt Benson
> > >>> > <gudnabrsam@yahoo.com>
> > wrote:
> > >>> > >
> > >>> > >>
> > >>> > >> It should be as simple as
> Thing
> > _containing_ a
> > >>> > List<Thing> rather than
> > >>> > >> _being_ a
> > List<Thing>.=A0 Composition over
> > >>> > inheritance, do you see?
> > >>> > >>
> > >>> > >> HTH,
> > >>> > >> Matt
> > >>> > >>
> > >>> > >>
> > >>> > >> --- On Tue, 2/10/09,
> Andrew
> > Hughes
> > >>> > <ahhughes@gmail.com>
> > wrote:
> > >>> > >>
> > >>> > >> > From: Andrew Hughes
> > >>> > <ahhughes@gmail.com>
> > >>> > >> > Subject: Re: JXPath
> over
> > Generic
> > >>> > Collection<?>, How?
> > >>> > >> > To: "Commons Users
> List"
> > >>> > <user@commons.apache.org>,
> > >>> > >> gudnabrsam@yahoo.com
> > >>> > >> > Date: Tuesday,
> February 10,
> > 2009, 7:06 PM
> > >>> > >> > Matt, Thank You.
> > >>> > >> >
> > >>> > >> > Is there any other
> data
> > structure I can use
> > >>> > that would work
> > >>> > >> > with JXPath? My
> > >>> > >> > requirement is that...
> a
> > "Thing"
> > >>> > can have contain
> > >>> > >> > multiple child
> "Thing(s)"
> > >>> > >> > (and the children are
> > allowed to be
> > >>> > non-unique).
> > >>> > >> > This is equivalent to
> an
> > XML element as it
> > >>> > can contain
> > >>> > >> > multiple child
> > >>> > >> > elements, how do
> these
> > guy's handle it I
> > >>> > wonder?
> > >>> > >> >
> > >>> > >> > --Andrew
> > >>> > >> >
> > >>> > >> >
> > >>> > >> > On Wed, Feb 11, 2009
> at
> > 9:09 AM, Matt Benson
> > >>> > >> > <gudnabrsam@yahoo.com>
> > wrote:
> > >>> > >> >
> > >>> > >> > >
> > >>> > >> > > I admit I hadn't
> > looked at this with
> > >>> > a highly
> > >>> > >> > critical eye, but
> this
> > >>> > >> > > business of
> Thing
> > extending
> > >>> > ArrayList<Thing>
> > >>> > >> > seems quite strange to
> me.
> > >>> > >> > >=A0 JXPath
> basically
> > functions by
> > >>> > "opening up"
> > >>> > >> > collections
> automatically,
> > so
> > >>> > >> > > the very fact
> that
> > Thing is itself a
> > >>> > Collection
> > >>> > >> > implies that a Thing
> will
> > be
> > >>> > >> > > opened up, and
> its
> > children will be
> > >>> > searched... but in
> > >>> > >> > this example, either
> > >>> > >> > > there are no
> children,
> > at the leaves, or
> > >>> > the children
> > >>> > >> > themselves are
> > >>> > >> > > (possibly empty)
> > collections.=A0 It looks
> > >>> > as though
> > >>> > >> > you're trying to
> represent
> > >>> > >> > > a tree
> > structure.=A0 This may be a good
> > >>> > example of a
> > >>> > >> > reason for the idea
> of
> > >>> > >> > > composition over
> > inheritance.=A0 I
> > >>> > don't think
> > >>> > >> > you're going to get
> any
> > >>> > >> > > traction using
> JXPath
> > with this object
> > >>> > model.
> > >>> > >> > >
> > >>> > >> > > Sorry for the
> bad
> > news,
> > >>> > >> > > Matt
> > >>> > >> > >
> > >>> > >> > >
> > >>> > >> > > --- On Tue,
> 2/10/09,
> > Andrew Hughes
> > >>> > >> > <ahhughes@gmail.com>
> > wrote:
> > >>> > >> > >
> > >>> > >> > > > From:
> Andrew
> > Hughes
> > >>> > <ahhughes@gmail.com>
> > >>> > >> > > > Subject:
> Re:
> > JXPath over Generic
> > >>> > >> > Collection<?>,
> How?
> > >>> > >> > > > To:
> "Commons
> > Users List"
> > >>> > >> > <user@commons.apache.org>
> > >>> > >> > > > Date:
> Tuesday,
> > February 10, 2009,
> > >>> > 7:16 AM
> > >>> > >> > > > Still
> busted.
> > Example is now
> > >>> > simplified. As soon
> > >>> > >> > as a
> > >>> > >> > > > generic
> > Collection
> > >>> > >> > > > becomes
> involved
> > BOOM!
> > >>> > >> > > >
> > >>> > >> > > > The Main
> Method
> > to exec:
> > >>> > >> > > > public class
> App
> > {
> > >>> > >> > > >=A0
> > =A0=A0=A0public static void main(
> > >>> > String[] args ){
> > >>> > >> > > >=A0 =A0
> > =A0 =A0=A0=A0JXPathContext context =3D
> > >>> > >> > > >
> > JXPathContext.newContext(new
> > >>> > ThingRoot());
> > >>> > >> > > >
> > >>> > >> > > >
> > >>> > >> >
> > >>> >
> >
> System.out.println(((Thing)context.getValue("/root")).getName());
> > >>> > >> > > >=A0
> > =A0=A0=A0}
> > >>> > >> > > > }
> > >>> > >> > > >
> > >>> > >> > > > The
> (populated)
> > context root I am
> > >>> > using, where
> > >>> > >> > root is a
> > >>> > >> > > > single
> object
> > >>> > >> > > > holding a
> List of
> > Thing's.
> > >>> > >> > > > package
> > jxpathresearch;
> > >>> > >> > > >
> > >>> > >> > > > import
> > java.util.ArrayList;
> > >>> > >> > > > import
> > java.util.List;
> > >>> > >> > > >
> > >>> > >> > > > public
> class
> > ThingRoot {
> > >>> > >> > > >=A0
> > =A0=A0=A0private List<Thing> root
> > >>> > new
> > >>> > >> > ArrayList(); //this
> > >>> > >> > > > will serve
> as the
> > root.
> > >>> > >> > > >=A0
> > =A0=A0=A0public ThingRoot() {
> > >>> > >> > > >=A0 =A0
> > =A0 =A0=A0=A0Thing animal =3D new
> > >>> > >> > Thing("Animal");
> > >>> > >> > > >=A0 =A0
> > =A0 =A0=A0=A0root.add(animal);//Animal
> > >>> > >> > > >=A0 =A0
> > =A0 =A0=A0=A0Thing dog =3D new
> > >>> > Thing("Dog");
> > >>> > >> > > >
> > >>> > animal.add(dog);//Animal.Dog
> > >>> > >> > > >=A0 =A0
> > =A0 =A0=A0=A0dog.add(new
> > >>> > >> > > >
> > >>> > >> >
> > >>> >
> Thing("Labrador"));//Animal.Dog.Labrador
> > >>> > >> > > >=A0 =A0
> > =A0 =A0=A0=A0dog.add(new
> > >>> > >> > > >
> > >>> > Thing("Boxer"));//Animal.Dog.Boxer
> > >>> > >> > > >=A0
> > =A0=A0=A0}
> > >>> > >> > > >=A0
> > =A0=A0=A0public List<Thing>
> > >>> > getRoot() { return
> > >>> > >> > root; }
> > >>> > >> > > > }
> > >>> > >> > > >
> > >>> > >> > > > Finally
> here's a
> > very simple
> > >>> > 'Thing'
> > >>> > >> > that
> > >>> > >> > > > contains a
> List
> > of Thing(s):
> > >>> > >> > > > public
> class
> > Thing extends
> > >>> > ArrayList<Thing>
> > >>> > >> > {
> > >>> > >> > > >=A0
> > =A0=A0=A0public Thing(String
> > >>> > name){this.name =3D name;}
> > >>> > >> > > >=A0
> > =A0=A0=A0private String name =3D
> > >>> > "";
> > >>> > >> > > >=A0
> > =A0=A0=A0public String getName() {return
> > >>> > name;}
> > >>> > >> > > > }
> > >>> > >> > > >
> > >>> > >> > > > I can't
> query
> > anything beyond
> > >>> > /root, it
> > >>> > >> > doesn't
> > >>> > >> > > > seem to ever
> get
> > traversed.
> > >>> > >> > > > I would
> expect
> > results for //Thing
> > >>> > and
> > >>> > >> > > >
> > //Thing[@name=3D'Labrador']
> > >>> > etc but I
> > >>> > >> > > > get no
> results
> > only exceptions.
> > >>> > >> > > >
> > >>> > >> > > >
> > >>> > >> > > > My brain is
> > hurting.
> > >>> > >> > > >
> > >>> > >> > > >
> > >>> > >> > > >
> > >>> > >> > > > On Tue, Feb
> 10,
> > 2009 at 12:22 AM,
> > >>> > Andrew Hughes
> > >>> > >> > > > <ahhughes@gmail.com>
> > wrote:
> > >>> > >> > > >
> > >>> > >> > > > > I've
> noew
> > tested a whole
> > >>> > heap of
> > >>> > >> > expressions even
> > >>> > >> > > >
> //name=3D'Tiger'
> > nothing
> > >>> > >> > > > > works.
> > >>> > >> > > > >
> > >>> > >> > > > > On Tue,
> Feb
> > 10, 2009 at 12:01
> > >>> > AM, Andrew
> > >>> > >> > Hughes
> > >>> > >> > > > <ahhughes@gmail.com>wrote:
> > >>> > >> > > > >
> > >>> > >> > > > >> I
> got
> > cracking on testing
> > >>> > this out... no
> > >>> > >> > luck
> > >>> > >> > > > (yet).
> Here's my
> > testing
> > >>> > >> > > > >>
> code if
> > some kind person
> > >>> > could please
> > >>> > >> > take a
> > >>> > >> > > > look....
> > >>> > >> > > > >>
> First my
> > generic
> > >>> > collection hierarchy
> > >>> > >> > (which only
> > >>> > >> > > > contains a
> name
> > and
> > >>> > >> > > > >>
> > children)...
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> package
> > jxpathresearch;
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> import
> > >>> > java.util.ArrayList;
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> public
> > class HierarchyPojo
> > >>> > extends
> > >>> > >> > > >
> > ArrayList<HierarchyPojo> {
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0public
> > >>> > HierarchyPojo(String name){
> > >>> > >> > > > >>
> > >>> > this.setName(name);
> > >>> > >> > > > >>=A0
> > =A0=A0=A0}
> > >>> > >> > > > >>=A0
> > =A0=A0=A0private String name =3D
> > >>> > "";
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0public String
> > >>> > getName() {
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0return name;
> > >>> > >> > > > >>=A0
> > =A0=A0=A0}
> > >>> > >> > > > >>=A0
> > =A0=A0=A0public void
> > >>> > setName(String name) {
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0this.name =3D name;
> > >>> > >> > > > >>=A0
> > =A0=A0=A0}
> > >>> > >> > > > >>
> > >>> > >> > > > >> }
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> Next,
> > the wrapper for the
> > >>> > root context
> > >>> > >> > (as Matt
> > >>> > >> > > > suggested)
> and
> > populated
> > >>> > >> > > > >>
> with
> > animals...
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> package
> > jxpathresearch;
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> public
> > class
> > >>> > CollectionRoot {
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0private HierarchyPojo
> > >>> > hierarchyPojo;
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0public
> > >>> > CollectionRoot(){
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0//Animal
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0hierarchyPojo =3D
> > >>> > new
> > >>> > >> > > >
> > HierarchyPojo("Animal");
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0//Animal.Dog
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0HierarchyPojo dog
> > >>> > =3D new
> > >>> > >> > > >
> > HierarchyPojo("Dog");
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > //Animal.Dog.Labrador
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0dog.add(new
> > >>> > >> > > >
> > >>> > HierarchyPojo("Labrador"));
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0//Animal.Dog.Boxer
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0dog.add(new
> > >>> > >> > > >
> > HierarchyPojo("Boxer"));
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > //Animal.Dog.Mastiff
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0dog.add(new
> > >>> > >> > > >
> > >>> > HierarchyPojo("Mastiff"));
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0//Animal.Cat
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0HierarchyPojo cat
> > >>> > =3D new
> > >>> > >> > > >
> > HierarchyPojo("Cat");
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0//Animal.Cat.Tiger
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0cat.add(new
> > >>> > >> > > >
> > HierarchyPojo("Tiger"));
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > //Animal.Cat.Cougar
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0cat.add(new
> > >>> > >> > > >
> > HierarchyPojo("Cougar"));
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > //Animal.Cat.Leopard
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0cat.add(new
> > >>> > >> > > >
> > >>> > HierarchyPojo("Leopard"));
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0//Add Animal.Dog
> > >>> > &
> > >>> > >> > Animal.Cat
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > hierarchyPojo.add(dog);
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > hierarchyPojo.add(cat);
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0}
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0public HierarchyPojo
> > >>> > >> > getHierarchyPojo()
> > >>> > >> > > > {return
> > hierarchyPojo;}
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0public void
> > >>> > >> >
> > setHierarchyPojo(HierarchyPojo
> > >>> > >> > > >
> hierarchyPojo)
> > >>> > >> > > > >>
> > {this.hierarchyPojo =3D
> > >>> > hierarchyPojo;}
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >> }
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> Finally
> > invoke and test...
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> public
> > class App
> > >>> > >> > > > >>
> > >>> > >> > > > >> {
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0public static void
> > >>> > main( String[]
> > >>> > >> > args )
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0{
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0JXPathContext
> > >>> > context =3D
> > >>> > >> > > >
> > JXPathContext.newContext(new
> > >>> > >> > > > >>
> > CollectionRoot());
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0String query =3D
> > >>> > >> > > >
> > >>> > >> >
> > >>> > "//hierarchyPojo[@name=3D'Tiger']";
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0 =A0 =A0=A0=A0String fName =3D
> > >>> > >> > > >
> > context.getValue(query).toString();
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > System.out.println("Ran
> > >>> > >> > > > '"+query+"'
> and
> > >>> > got
> > >>> > >> > > >
> > >>> > '"+fName+"'");
> > >>> > >> > > > >>
> > >>> > >> > > > >>=A0
> > =A0=A0=A0}
> > >>> > >> > > > >>
> > >>> > >> > > > >> }
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> Above,
> > should find one
> > >>> > entry for
> > >>> > >> > > > 'name=3DTiger'
> but
> > it does
> > >>> > not, I get an
> > >>> > >> > > > >>
> > exception. This still
> > >>> > doesn't seem
> > >>> > >> > to traverse
> > >>> > >> > > > the
> Collection
> > correctly. Any
> > >>> > >> > > > >>
> help
> > would be most
> > >>> > welcome.
> > >>> > >> > > > >>
> > Exception in thread
> > >>> > "main"
> > >>> > >> > > > >>
> > >>> > >> >
> > >>> >
> > org.apache.commons.jxpath.JXPathNotFoundException:
> > >>> > >> > > > No value
> for
> > xpath:
> > >>> > >> > > > >>
> > >>> > //hierarchyPojo[@name=3D'Tiger']
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> Thanks
> > for reading,
> > >>> > >> > > > >>
> Andrew
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >>
> > >>> > >> > > > >> On
> Mon,
> > Feb 9, 2009 at
> > >>> > 10:24 PM, Andrew
> > >>> > >> > Hughes
> > >>> > >> > > > <ahhughes@gmail.com>wrote:
> > >>> > >> > > > >>
> > >>> > >> > > >
> >>>
> > Thanks Matt - I will
> > >>> > test this out
> > >>> > >> > tomorrow
> > >>> > >> > > > when I am
> back in
> > the
> > >>> > >> > > >
> >>>
> > office...
> > >>> > >> > > >
> >>>
> > >>> > >> > > >
> >>>
> > Being constructive...
> > >>> > >> > > >
> >>>
> > Surely this should at
> > >>> > least be a
> > >>> > >> > precondition
> > >>> > >> > > > check and
> throw a
> > specific
> > >>> > >> > > >
> >>>
> > exception if it's
> > >>> > not supported?
> > >>> > >> > > >
> >>>
> > Thank You
> > >>> > >> > > >
> >>>
> > --Andrew
> > >>> > >> > > >
> >>>
> > >>> > >> > > >
> >>>
> > >>> > >> > > > >>>
> On
> > Mon, Feb 9, 2009 at
> > >>> > 2:27 PM, Matt
> > >>> > >> > Benson
> > >>> > >> > > > <gudnabrsam@yahoo.com>wrote:
> > >>> > >> > > >
> >>>
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > Most likely your
> > >>> > problem is not
> > >>> > >> > with
> > >>> > >> > > > generics,
> but
> > simply with the fact
> > >>> > >> > > >
> >>>>
> > that JXPath has a
> > >>> > hard time
> > >>> > >> > using a
> > >>> > >> > > > collection
> as its
> > root.=A0 The
> > >>> > easiest
> > >>> > >> > > >
> >>>>
> > workaround is to
> > >>> > use some parent
> > >>> > >> > object to
> > >>> > >> > > > hold a
> reference
> > to your
> > >>> > >> > > >
> >>>>
> > container.
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > HTH,
> > >>> > >> > > >
> >>>>
> > Matt
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > --- On Sun,
> > >>> > 2/8/09, Andrew
> > >>> > >> > Hughes
> > >>> > >> > > > <ahhughes@gmail.com>
> > wrote:
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > > From: Andrew
> > >>> > Hughes
> > >>> > >> > > > <ahhughes@gmail.com>
> > >>> > >> > > >
> >>>>
> > > Subject:
> > >>> > JXPath over
> > >>> > >> > Generic
> > >>> > >> > > >
> > Collection<?>, How?
> > >>> > >> > > >
> >>>>
> > > To:
> > >>> > "Commons Users
> > >>> > >> > List"
> > >>> > >> > > > <user@commons.apache.org>
> > >>> > >> > > >
> >>>>
> > > Date: Sunday,
> > >>> > February 8,
> > >>> > >> > 2009, 5:09
> > >>> > >> > > > PM
> > >>> > >> > > >
> >>>>
> > > Hi All,
> > >>> > >> > > >
> >>>>
> > > Hopefully the
> > >>> > solution is
> > >>> > >> > as easy as
> > >>> > >> > > > the
> question. I
> > would
> > >>> > >> > > >
> >>>>
> > > like to
> > >>> > perform
> > >>> > >> > > >
> >>>>
> > > evaluation on
> > >>> > a (very
> > >>> > >> > simple) generic
> > >>> > >> > > >
> collection... as
> > you
> > >>> > >> > > >
> >>>>
> > > can see below
> > >>> > >> > > >
> >>>>
> > >
> > >>> > (HeirarchyPojo). I should
> > >>> > >> > be able to
> > >>> > >> > > > ask for a
> > >>> > >> > > >
> >>>>
> > >
> > >>> > HeirarchyPojo's with
> > >>> > >> > > >
> >>>>
> > >
> > >>> > name=3D'Bill' or the
> > >>> > >> > 3rd
> > >>> > >> > > > Child...
> The
> > problem is that
> > >>> > >> > > >
> >>>>
> > > nothing ever
> > >>> > evaluate on
> > >>> > >> > > >
> >>>>
> > > this data
> > >>> > structure.
> > >>> > >> > What's the
> > >>> > >> > > > deal with
> > Generic
> > >>> > >> > > >
> >>>>
> > > Collections
> > >>> > and JXPath?
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > > p.s this is
> > >>> > not in the
> > >>> > >> > userguide and
> > >>> > >> > > > would be a
> most
> > >>> > >> > > >
> >>>>
> > > welcomed
> > >>> > addition (if
> > >>> > >> > > >
> >>>>
> > > we can nut
> > >>> > this out with
> > >>> > >> > your help).
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > > Cheers.
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > > package
> > >>> > xpath.and.generics;
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > > import
> > >>> > java.util.ArrayList;
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > > public class
> > >>> > HeirarchyPojo
> > >>> > >> > extends
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> >
> > ArrayList<HeirarchyPojo>{
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0public
> > >>> > >> > HeirarchyPojo(){}
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0private
> > >>> > String id;
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0private
> > >>> > String name;
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0public
> > >>> > String getId() {
> > >>> > >> > > >
> >>>>
> > >
> > >>> > return id;
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0}
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0public
> > >>> > void
> > >>> > >> > setId(String id) {
> > >>> > >> > > >
> >>>>
> > >
> > >>> > this.id =3D id;
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0}
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0public
> > >>> > String getName()
> > >>> > >> > {
> > >>> > >> > > >
> >>>>
> > >
> > >>> > return name;
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0}
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0public
> > >>> > void
> > >>> > >> > setName(String name)
> > >>> > >> > > > {
> > >>> > >> > > >
> >>>>
> > >
> > >>> > this.name =3D name;
> > >>> > >> > > >
> >>>>
> > >=A0 =A0=A0=A0}
> > >>> > >> > > >
> >>>>
> > >
> > >>> > >> > > >
> >>>>
> > > }
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> > >>> > >> >
> > >>> >
> >
> ---------------------------------------------------------------------
> > >>> > >> > > >
> >>>>
> > To unsubscribe,
> > >>> > e-mail:
> > >>> > >> > > > user-unsubscribe@commons.apache.org
> > >>> > >> > > >
> >>>>
> > For additional
> > >>> > commands, e-mail:
> > >>> > >> > > > user-help@commons.apache.org
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>>
> > >>> > >> > > >
> >>>
> > >>> > >> > > > >>
> > >>> > >> > > > >
> > >>> > >> > >
> > >>> > >> > >
> > >>> > >> > >
> > >>> > >> > >
> > >>> > >> > >
> > >>> > >> >
> > >>> >
> >
> ---------------------------------------------------------------------
> > >>> > >> > > To unsubscribe,
> > e-mail:
> > >>> > >> > user-unsubscribe@commons.apache.org
> > >>> > >> > > For additional
> > commands, e-mail:
> > >>> > >> > user-help@commons.apache.org
> > >>> > >> > >
> > >>> > >> > >
> > >>> > >>
> > >>> > >>
> > >>> > >>
> > >>> > >>
> > >>> > >>
> > >>> >
> >
> ---------------------------------------------------------------------
> > >>> > >> To unsubscribe, e-mail:
> > >>> > user-unsubscribe@commons.apache.org
> > >>> > >> For additional commands,
> > e-mail:
> > >>> > user-help@commons.apache.org
> > >>> > >>
> > >>> > >>
> > >>> > >
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> >
> ---------------------------------------------------------------------
> > >>> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> > >>> For additional commands, e-mail: user-help@commons.apache.org
> > >>>
> > >>>
> > >>
> > >
> >=20
>=20
>=20
>=20
>=20
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>=20
> =0A=0A=0A      

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