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From Andrew Hughes <ahhug...@gmail.com>
Subject Re: JXPath over Generic Collection<?>, How?
Date Thu, 26 Feb 2009 00:22:17 GMT
Indeed Matt, you are correct and I do apologize... but I must say I find
your emailed explanation much better. Kudos & Thanks!
I'll (finally) get a chance to work on this tomorrow, but I think I am still
stuck :'(


Cheers for everything so far!!!!


On Tue, Feb 24, 2009 at 1:43 PM, Matt Benson <gudnabrsam@yahoo.com> wrote:

>
> I won't get to look at this again at least before tomorrow (9PM for me now
> and still have some late-night $work to look at), but I thought I would
> mention straight off that the @name feature actually IS mentioned in the
> userguide under the section about working with (java.util.)Maps.  If you
> have a suggestion of where in the guide would be another good place to
> mention it as a caveat and/or even the wording to use, feel free to open a
> documentation issue in JIRA for it.
>
> TBC,
> Matt
>
> --- On Mon, 2/23/09, 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: Monday, February 23, 2009, 6:24 PM
> > Hi Matt,
> > Thanks HEAPS for you reply, I am really really really
> > grateful. I think that
> > I have progressed just a little with this but there are
> > still some BIG
> > shortfalls with this. I've attached code that should run
> > out the box and is
> > based on previous emails. If I can get the expressions
> > below to correctly
> > evaluate I would be heaps happy.
> >
> > Thanks heaps again, hopefully this will work soon enough.
> >
> > p.s. I can understand the 'name' vs '@name', perhaps the
> > userguide could
> > mention this is about all I can add.
> >
> >
> > code...
> >
> > package rnd;
> >
> > import java.util.ArrayList;
> >
> > import org.apache.commons.beanutils.LazyDynaBean;
> > import org.apache.commons.jxpath.JXPathContext;
> > import org.apache.log4j.Logger;
> >
> > public class Main {
> >
> > private static final Logger log =
> > Logger.getLogger(Main.class);
> >
> > public static void main(String[] args) {
> > log.info("Starting...");
> > LazyDynaBean lazyDynaBean = new LazyDynaBean(); //the
> > transparent root.
> > LazyDynaBean root = new LazyDynaBean();
> > LazyDynaBean animal = new LazyDynaBean();
> > LazyDynaBean dog = new LazyDynaBean();
> > LazyDynaBean cat = new LazyDynaBean();
> > LazyDynaBean boxer = new LazyDynaBean();
> > LazyDynaBean labrador = new LazyDynaBean();
> > LazyDynaBean tiger1 = new LazyDynaBean();
> > LazyDynaBean tiger2 = new LazyDynaBean();
> > LazyDynaBean tiger3 = new LazyDynaBean();
> > LazyDynaBean lion = new LazyDynaBean();
> > //set the @objectName property of each bean, user UPPER to
> > make them
> > distinct for examples.
> > root.set("objectName","ROOT");
> > animal.set("objectName","ANIMAL");
> > dog.set("objectName","DOG");
> > cat.set("objectName","CAT");
> > boxer.set("objectName","BOXER");
> > labrador.set("objectName","LABRADOR");
> > tiger1.set("objectName","TIGER-ONE");
> > tiger2.set("objectName","TIGER-TWO");
> > tiger3.set("objectName","TIGER-THREE");
> > lion.set("objectName","LION");
> > //build the bean hierarchy.
> > lazyDynaBean.set("root",0, root);
> > root.set("animal",0, animal);
> > animal.set("dog",0,dog);
> > animal.set("cat",0,cat);
> > dog.set("labrador",0,labrador);
> > dog.set("boxer",0, boxer);
> > cat.set("tiger",0,tiger1);//duplicate
> > cat.set("tiger",1,tiger2);//duplicate
> > cat.set("tiger",2,tiger3);//duplicate
> > cat.set("lion",0,lion);
> >         JXPathContext context =
> > JXPathContext.newContext(lazyDynaBean);
> >
> >         //these all work
> >
> > runEvaluation("/root/animal/dog", context); //absolute &
> > single
> >
> > runEvaluation("/root/animal/cat/tiger[2]", context);
> > //absolute &
> > single
> >
> > runEvaluation("/root/animal/cat/tiger", context); //absolute
> > &
> > multiple
> >         //everything below fails
> >
> > runEvaluation("/root/animal/cat/tiger[last()]", context);
> > //absolute
> > & single
> >
> > runEvaluation("/root/animal/dog/*", context); //absolute
> > & multiple
> >         runEvaluation("//dog",
> > context); //deep search
> >         runEvaluation("//dog/*",
> > context);//deep multiple
> >
> > runEvaluation("//cat/*[objectName='LION']", context);//deep
> > filter
> >
> > }
> >  public static void runEvaluation(String
> > expression,JXPathContext context){
> > log.info("About to evaulate the expression: "+expression);
> >         try {
> > Object value = context.getValue(expression);
> > //we got a single result.
> > if (value instanceof LazyDynaBean) {
> > LazyDynaBean r =
> > (LazyDynaBean)context.getValue(expression);
> > log.info("Ran '" + expression + "' and got objectName='" +
> > r.get("objectName") + "'");
> >  }
> > //we got multiple results
> > else if (value instanceof ArrayList) {
> > String titles = "";
> > for (LazyDynaBean bean : ((ArrayList<LazyDynaBean>)
> > value )){
> > titles += (bean.get("objectName")+",");
> > }
> > log.info("Ran " + expression + " and got
> > "+((ArrayList)value).size()+"
> > results: "+titles);
> > }
> > //we got a non-dyna bean.
> > else {
> > log.info("Ran '" + expression + "' and got a class '" +
> > value.getClass().getName() + "' with toString() '"
> > +value.toString() + "'");
> > }
> > } catch (Exception e) {
> > log.error(e);
> > }
> > }
> > }
> >
> >
> >
> >
> >
> > On Tue, Feb 24, 2009 at 8:58 AM, Matt Benson <gudnabrsam@yahoo.com>
> > wrote:
> >
> > >
> > > And the answer is:
> > >
> > >  In JXPath, a decision was made to overload the
> > name attribute to refer to
> > > an "element"'s property name WRT its parent.  The
> > reason this was done was
> > > to support query maps with non-String keys in
> > JXPath.  This means that
> > > anytime you actually want to refer to a property whose
> > name literally is
> > > "name", you must treat it as a child element rather
> > than an attribute.  So
> > > in your case you could either change "name" to "title"
> > and query
> > > [@title='foo'] or simply use [name='foo'].
> > >
> > > Regards,
> > > 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, 2:58 PM
> > > >
> > > > To follow up, the 'name' attribute in particular
> > is what
> > > > doesn't seem to be working here (change it to
> > e.g. 'game'
> > > > and it works fine)... if you could file a bug it
> > would help
> > > > me remember as I don't have time to do it myself
> > right this
> > > > minute.
> > > >
> > > > -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
> > > > >
> > > > > Andrew,
> > > > >   I've been meaning to look
> > into this but haven't
> > > > > yet.  If you have any ready-to-run code
> > you can send
> > > > to
> > > > > the list, that wouldn't hurt...
> > > > >
> > > > > -Matt
> > > > >
> > > > > --- On Mon, 2/23/09, 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: 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
> > > > > >
> > > > > >
> > > > > > On Tue, Feb 17, 2009 at 1:11 PM, Andrew
> > Hughes
> > > > <ahhughes@gmail.com>
> > > > > > wrote:
> > > > > >
> > > > > > > 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="ROOT"]
> > > > > > >>     +
> > animal [@name="ANIMAL"]
> > > > > > >>
> >    + dog
> > > > > > [@name="DOG"]
> > > > > > >>
> > > > > >    + boxer [@name="BOXER"]
> > > > > > >>
> > > > > >    + labrador
> > [@name="LABRADOR"]
> > > > > > >>
> >    + cat
> > > > > > [@name="CAT"]
> > > > > > >>
> > > > > >    + tiger
> > [@name="TIGER-ONE"]
> > > > > > >>
> > > > > >    + tiger
> > [@name="TIGER-TWO"]
> > > > > > >>
> > > > > >    + tiger
> > [@name="TIGER-THREE"]
> > > > > > >>
> > > > > >    + lion [@name="LION"]
> > > > > > >>
> > > > > > >>
> > > > > > >> And the code looks like...
> > > > > > >>
> > > > > > >>  LazyDynaBean
> > lazyDynaBean = new
> > > > > > LazyDynaBean(); //the transparent
> > root.
> > > > > > >>  LazyDynaBean root = new
> > > > LazyDynaBean();
> > > > > > >> LazyDynaBean animal = new
> > > > LazyDynaBean();
> > > > > > >>  LazyDynaBean dog = new
> > > > LazyDynaBean();
> > > > > > >> LazyDynaBean cat = new
> > LazyDynaBean();
> > > > > > >>  LazyDynaBean boxer =
> > new
> > > > LazyDynaBean();
> > > > > > >> LazyDynaBean labrador = new
> > > > LazyDynaBean();
> > > > > > >>  LazyDynaBean tiger1 =
> > new
> > > > LazyDynaBean();
> > > > > > >> LazyDynaBean tiger2 = new
> > > > LazyDynaBean();
> > > > > > >>  LazyDynaBean tiger3 =
> > new
> > > > LazyDynaBean();
> > > > > > >> LazyDynaBean lion = new
> > LazyDynaBean();
> > > > > > >>  //set the @name property
> > of each
> > > > bean,
> > > > > user
> > > > > > UPPER to make them distinct
> > > > > > >> for examples.
> > > > > > >> root.set("name","ROOT");
> > > > > > >>
> > animal.set("name","ANIMAL");
> > > > > > >> dog.set("name","DOG");
> > > > > > >>  cat.set("name","CAT");
> > > > > > >> boxer.set("name","BOXER");
> > > > > > >>
> > labrador.set("name","LABRADOR");
> > > > > > >>
> > tiger1.set("name","TIGER-ONE");
> > > > > > >>
> > tiger2.set("name","TIGER-TWO");
> > > > > > >>
> > tiger3.set("name","TIGER-THREE");
> > > > > > >>
> > lion.set("name","LION");
> > > > > > >> //build the bean hierarchy.
> > > > > > >>
> > lazyDynaBean.set("root",0, root);
> > > > > > >> root.set("animal",0, animal);
> > > > > > >>
> > animal.set("dog",0,dog);
> > > > > > >> animal.set("cat",0,cat);
> > > > > > >>
> > dog.set("labrador",0,labrador);
> > > > > > >>  dog.set("boxer",0,
> > boxer);
> > > > > > >>
> > cat.set("tiger",0,tiger1);//duplicate
> > > > > > >>
> > cat.set("tiger",1,tiger2);//duplicate
> > > > > > >>
> > cat.set("tiger",1,tiger3);//duplicate
> > > > > > >>  cat.set("lion",0,lion);
> > > > > > >>
> > > > > >    JXPathContext context =
> > > > > >
> > JXPathContext.newContext(lazyDynaBean);
> > > > > > >>
> >    String query
> > > > > > = "/root/animal/cat/tiger";
> > > > > > >>
> >    Object value
> > > > > > = context.getValue(query);
> > > > > > >>
> > > > > > >>
> > > > > > >> But there's a problem with
> > JXPath
> > > > querying
> > > > > this
> > > > > > also. Absolute Paths like
> > > > > > >>  '/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='LION']
> > > > > > >>
> > > > /root/animal/cat/tiger[@name='TIGER-TWO']
> > > > > > >>
> > > > > > >> Things are looking up, but is
> > this
> > > > behavior
> > > > > to be
> > > > > > expected?
> > > > > > >>
> > > > > > >>  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 {
> > > > > > >>> >
> > > > > > >>> >
> >    public
> > > > > > Thing(String name) {
> > > > > > >>> >
> > > > > >    this.name = name;
> > > > > > >>> >
> >    }
> > > > > > >>> >
> >    private String
> > > > > > name = "";
> > > > > > >>> >
> > > > > > >>> >
> >    public String
> > > > > > getName() {
> > > > > > >>> >
> > > > > >    return name;
> > > > > > >>> >
> >    }
> > > > > > >>> >
> >    private
> > > > > > ArrayList<Thing> children = new
> > > > > > >>> >
> > ArrayList<Thing>();
> > > > > > >>> >
> > > > > > >>> >
> >    public
> > > > > > ArrayList<Thing> getChildren() {
> > > > > > >>> >
> > > > > >    return children;
> > > > > > >>> >
> >    }
> > > > > > >>> >
> > > > > > >>> > }
> > > > > > >>> >
> > > > > > >>> >
> > > > > > >>> >
> >    public static
> > > > > > void main(String[] args) {
> > > > > > >>> >
> > > > > >    //get some same data
> > > > > > >>> >
> > > > > >    Thing animal = new
> > Thing("Animal");
> > > > > > >>> >
> > > > > >    //Animal.Dog.*
> > > > > > >>> >
> > > > > >    Thing dog = new
> > Thing("Dog");
> > > > > > >>> >
> > > > > >    dog.getChildren().add(new
> > > > > > >>> > Thing("Labrador"));
> > > > > > >>> >
> > > > > >    dog.getChildren().add(new
> > > > > > >>> > Thing("Boxer"));
> > > > > > >>> >
> > > > > >
> > animal.getChildren().add(dog);
> > > > > > >>> >
> > > > > >    //Animal.Cat.*
> > > > > > >>> >
> > > > > >    Thing cat = new
> > Thing("Cat");
> > > > > > >>> >
> > > > > >    cat.getChildren().add(new
> > Thing("Lion"));
> > > > > > >>> >
> > > > > >    cat.getChildren().add(new
> > > > > > >>> > Thing("Tiger"));
> > > > > > >>> >
> > > > > >
> > animal.getChildren().add(cat);
> > > > > > >>> >
> > > > > > >>> >
> > > > > >    //run a query on it
> > > > > > >>> >
> > > > > >    JXPathContext context =
> > > > > > >>> >
> > > > JXPathContext.newContext(animal);
> > > > > > >>> >
> > > > > >    String query = "/Animal";
> > > > > > >>> >
> > > > > >    Thing result = (Thing)
> > > > > > context.getValue(query);
> > > > > > >>> >
> > > > > >    String path =
> > > > > > context.getPointer(query).asPath();
> > > > > > >>> >
> > > > > >    System.out.println("Ran '"
> > + query +
> > > > > > >>> > "' and got '" +
> > > > > > >>> > result.getName() + "'
> > on path
> > > > '" +
> > > > > path
> > > > > > +
> > > > > > >>> > "'.");
> > > > > > >>> >
> >    }
> > > > > > >>> >
> > > > > > >>>
> > > > > > >>> What would you be trying
> > to
> > > > select?  If
> > > > > > you want to know how to look for
> > > > > > >>> a given Thing in this
> > graph, I can
> > > > > probably
> > > > > > help.  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.  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 {
> > > > > > >>> > >
> > > > > > >>> > >
> > 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>.  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.
> > > > > > >>> > >> >
> > >  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.  It looks
> > > > > > >>> > as though
> > > > > > >>> > >> > you're
> > trying to
> > > > > represent
> > > > > > >>> > >> > > a
> > tree
> > > > > > structure.  This may be a good
> > > > > > >>> > example of a
> > > > > > >>> > >> > reason
> > for the
> > > > idea
> > > > > of
> > > > > > >>> > >> > >
> > composition
> > > > over
> > > > > > inheritance.  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
> > > > > > {
> > > > > > >>> > >> > >
> > >
> > > > > >    public static void main(
> > > > > > >>> > String[] args ){
> > > > > > >>> > >> > >
> > >
> > > > > >      JXPathContext
> > context =
> > > > > > >>> > >> > >
> > >
> > > > > > JXPathContext.newContext(new
> > > > > > >>> > ThingRoot());
> > > > > > >>> > >> > >
> > >
> > > > > > >>> > >> > >
> > >
> > > > > > >>> > >> >
> > > > > > >>> >
> > > > > >
> > > > >
> > > >
> > System.out.println(((Thing)context.getValue("/root")).getName());
> > > > > > >>> > >> > >
> > >
> > > > > >    }
> > > > > > >>> > >> > >
> > > }
> > > > > > >>> > >> > >
> > >
> > > > > > >>> > >> > >
> > > 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 {
> > > > > > >>> > >> > >
> > >
> > > > > >    private List<Thing>
> > root
> > > > > > >>> > new
> > > > > > >>> > >> >
> > ArrayList();
> > > > //this
> > > > > > >>> > >> > >
> > > will
> > > > serve
> > > > > as the
> > > > > > root.
> > > > > > >>> > >> > >
> > >
> > > > > >    public ThingRoot() {
> > > > > > >>> > >> > >
> > >
> > > > > >      Thing animal = new
> > > > > > >>> > >> >
> > Thing("Animal");
> > > > > > >>> > >> > >
> > >
> > > > > >
> > root.add(animal);//Animal
> > > > > > >>> > >> > >
> > >
> > > > > >      Thing dog = new
> > > > > > >>> > Thing("Dog");
> > > > > > >>> > >> > >
> > >
> > > > > > >>> >
> > animal.add(dog);//Animal.Dog
> > > > > > >>> > >> > >
> > >
> > > > > >      dog.add(new
> > > > > > >>> > >> > >
> > >
> > > > > > >>> > >> >
> > > > > > >>> >
> > > > > Thing("Labrador"));//Animal.Dog.Labrador
> > > > > > >>> > >> > >
> > >
> > > > > >      dog.add(new
> > > > > > >>> > >> > >
> > >
> > > > > > >>> >
> > > > Thing("Boxer"));//Animal.Dog.Boxer
> > > > > > >>> > >> > >
> > >
> > > > > >    }
> > > > > > >>> > >> > >
> > >
> > > > > >    public 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>
> > > > > > >>> > >> > {
> > > > > > >>> > >> > >
> > >
> > > > > >    public Thing(String
> > > > > > >>> > name){this.name =
> > name;}
> > > > > > >>> > >> > >
> > >
> > > > > >    private String name =
> > > > > > >>> > "";
> > > > > > >>> > >> > >
> > >
> > > > > >    public 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='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='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> {
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    public
> > > > > > >>> > HierarchyPojo(String
> > name){
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > this.setName(name);
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    }
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    private String name =
> > > > > > >>> > "";
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    public String
> > > > > > >>> > getName() {
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        return
> > name;
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    }
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    public void
> > > > > > >>> > setName(String name)
> > {
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        this.name =
> > name;
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    }
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >> }
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > Next,
> > > > > > the wrapper for the
> > > > > > >>> > root context
> > > > > > >>> > >> > (as
> > Matt
> > > > > > >>> > >> > >
> > >
> > > > suggested)
> > > > > and
> > > > > > populated
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > with
> > > > > > animals...
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > package
> > > > > > jxpathresearch;
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > public
> > > > > > class
> > > > > > >>> > CollectionRoot {
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    private HierarchyPojo
> > > > > > >>> > hierarchyPojo;
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    public
> > > > > > >>> > CollectionRoot(){
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        //Animal
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >
> > hierarchyPojo =
> > > > > > >>> > new
> > > > > > >>> > >> > >
> > >
> > > > > > HierarchyPojo("Animal");
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >
> > //Animal.Dog
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >
> > HierarchyPojo dog
> > > > > > >>> > = new
> > > > > > >>> > >> > >
> > >
> > > > > > HierarchyPojo("Dog");
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> >
> > //Animal.Dog.Labrador
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        dog.add(new
> > > > > > >>> > >> > >
> > >
> > > > > > >>> >
> > HierarchyPojo("Labrador"));
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >
> > //Animal.Dog.Boxer
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        dog.add(new
> > > > > > >>> > >> > >
> > >
> > > > > > HierarchyPojo("Boxer"));
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > //Animal.Dog.Mastiff
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        dog.add(new
> > > > > > >>> > >> > >
> > >
> > > > > > >>> >
> > HierarchyPojo("Mastiff"));
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >
> > //Animal.Cat
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >
> > HierarchyPojo cat
> > > > > > >>> > = new
> > > > > > >>> > >> > >
> > >
> > > > > > HierarchyPojo("Cat");
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >
> > //Animal.Cat.Tiger
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        cat.add(new
> > > > > > >>> > >> > >
> > >
> > > > > > HierarchyPojo("Tiger"));
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > //Animal.Cat.Cougar
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        cat.add(new
> > > > > > >>> > >> > >
> > >
> > > > > > HierarchyPojo("Cougar"));
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > //Animal.Cat.Leopard
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        cat.add(new
> > > > > > >>> > >> > >
> > >
> > > > > > >>> >
> > HierarchyPojo("Leopard"));
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        //Add
> > Animal.Dog
> > > > > > >>> > &
> > > > > > >>> > >> >
> > Animal.Cat
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> >
> > hierarchyPojo.add(dog);
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> >
> > hierarchyPojo.add(cat);
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    }
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    public HierarchyPojo
> > > > > > >>> > >> >
> > > > getHierarchyPojo()
> > > > > > >>> > >> > >
> > >
> > > > {return
> > > > > > hierarchyPojo;}
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    public void
> > > > > > >>> > >> >
> > > > > > setHierarchyPojo(HierarchyPojo
> > > > > > >>> > >> > >
> > >
> > > > > hierarchyPojo)
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > {this.hierarchyPojo =
> > > > > > >>> > hierarchyPojo;}
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >> }
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > Finally
> > > > > > invoke and test...
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > public
> > > > > > class App
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >> {
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    public static void
> > > > > > >>> > main( String[]
> > > > > > >>> > >> > args )
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    {
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >
> > JXPathContext
> > > > > > >>> > context =
> > > > > > >>> > >> > >
> > >
> > > > > > JXPathContext.newContext(new
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > CollectionRoot());
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        String query
> > =
> > > > > > >>> > >> > >
> > >
> > > > > > >>> > >> >
> > > > > > >>> >
> > > > "//hierarchyPojo[@name='Tiger']";
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >        String fName
> > =
> > > > > > >>> > >> > >
> > >
> > > > > > context.getValue(query).toString();
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> >
> > System.out.println("Ran
> > > > > > >>> > >> > >
> > >
> > > > '"+query+"'
> > > > > and
> > > > > > >>> > got
> > > > > > >>> > >> > >
> > >
> > > > > > >>> > '"+fName+"'");
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > >    }
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >> }
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > > >>> > >> > >
> > >
> > > > >>
> > > > > Above,
> > > > > > should find one
> > > > > > >>> > entry for
> > > > > > >>> > >> > >
> > >
> > > > 'name=Tiger'
> > > > > 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='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.  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='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>{
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     public
> > > > > > >>> > >> >
> > > > HeirarchyPojo(){}
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     private
> > > > > > >>> > String id;
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     private
> > > > > > >>> > String name;
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     public
> > > > > > >>> > String getId() {
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > return id;
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     }
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     public
> > > > > > >>> > void
> > > > > > >>> > >> >
> > setId(String id)
> > > > {
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > this.id = id;
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     }
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     public
> > > > > > >>> > String getName()
> > > > > > >>> > >> > {
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > return name;
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     }
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     public
> > > > > > >>> > void
> > > > > > >>> > >> >
> > setName(String
> > > > name)
> > > > > > >>> > >> > >
> > > {
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > this.name = name;
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >     }
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > > }
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > >>> > >> > >
> > >
> > > > > > >>> > >> >
> > > > > > >>> >
> > > > > >
> > > > >
> > > >
> > ---------------------------------------------------------------------
> > > > > > >>> > >> > >
> > >
> > > > > >>>>
> > > > > > 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
> > > > > > >>>
> > > > > > >>>
> > > > > > >>
> > > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > ---------------------------------------------------------------------
> > > > > 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
> > >
> > >
> >
>
>
>
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