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Date: Tue, 10 Feb 2009 00:01:12 +1030
Message-ID: <5f528cf40902090531n24fa6a4dwd469f63f1a1d0b1d@mail.gmail.com>
Subject: Re: JXPath over Generic Collection<?>, How?
From: Andrew Hughes <ahhughes@gmail.com>
To: Commons Users List <user@commons.apache.org>
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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;
>> >     }
>> >
>> > }
>>
>>
>>
>>
>> ---------------------------------------------------------------------
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>>
>

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