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Date: Mon, 16 May 2011 14:38:26 -0500
Message-ID: <BANLkTimTF0UzCWciU3WVcYEcVDhKCyA1hA@mail.gmail.com>
Subject: Re: [jxpath] Navigating across Lists
From: Matt Benson <gudnabrsam@gmail.com>
To: Commons Users List <user@commons.apache.org>
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On Mon, May 16, 2011 at 2:16 PM, Romain Rouvoy <romain.rouvoy@lifl.fr> wrot=
e:
> On 16 mai 2011, at 16:06, Matt Benson wrote:
>> On Mon, May 16, 2011 at 4:51 AM, Romain Rouvoy <romain.rouvoy@lifl.fr> w=
rote:
>>> I'm using JXPath to query a graph of beans, which are heavily using lis=
ts, e.g.:
>>>> public class A {
>>>> =A0 =A0 =A0 List<B> getB() {...}
>>>> }
>>>>
>>>> public class B {
>>>> =A0 =A0 =A0 String getName() {...}
>>>> =A0 =A0 =A0 List<C> getC() {...}
>>>> }
>>>>
>>>> public class C {
>>>> =A0 =A0 =A0 String getName() {...}
>>>> }
>>>
>>> However, when I'm querying this graph of beans, the following request d=
oes not match any elements (while it should return several elements):
>>>> org.apache.commons.jxpath.JXPathContext.newContext(new A());
>>>> context.getValue("b[@name=3D'foo']/c/name");
>>> Any idea? Does JXPath support navigation within lists?
>> What should happen is that getValue(expr) returns the first value specif=
ied by your expression, while iterate(expr) would be the way you would retr=
ieve multiple results. =A0If you can distill your problem down to a failing=
 JUnit test, please feel free to attach this to a JIRA issue.
>
> Thanks Matt, actually I use Scala to develop my application:
>> import scala.reflect.BeanProperty
>>
>> case class B(@BeanProperty val name:String)
>>
>> object a {
>> =A0 =A0 @BeanProperty val b =3D List[B](new B("FOOs"), new B("BARs"))
>> }
>
> The annotation @BeanProperty is used to generate getters at compile-time.
>
>
>> scala> val context =3D org.apache.commons.jxpath.JXPathContext.newContex=
t(a)
>> context: org.apache.commons.jxpath.JXPathContext =3D org.apache.commons.=
jxpath.ri.JXPathContextReferenceImpl@132bb617
>>
>> scala> context.getValue("b")
>> res27: java.lang.Object =3D List(B(FOOs), B(BARs))
>
> This is an expected behavior...
>
>
>> scala> context.getValue("b/name")
>> org.apache.commons.jxpath.JXPathNotFoundException: No value for xpath: b=
/name
>> =A0 =A0 =A0 at org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.g=
etValue(JXPathContextReferenceImpl.java:383)
>> =A0 =A0 =A0 at org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.g=
etValue(JXPathContextReferenceImpl.java:313)
>> =A0 =A0 =A0 at .<init>(<console>:29)
>> =A0 =A0 =A0 at .<clinit>(<console>)
>> =A0 =A0 =A0 at RequestResult$.<init>(<console>:9)
>> =A0 =A0 =A0 at RequestResult$.<clinit>(<console>)
>> =A0 =A0 =A0 at RequestResult$scala_repl_result(<console>)
>> =A0 =A0 =A0 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Metho=
d)
>> =A0 =A0 =A0 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodA=
ccessorImpl.java:39)
>> =A0 =A0 =A0 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Delegatin=
gMethodAccessorImpl.java:25)
>> =A0 =A0 =A0 at java.lang.reflect.Method.invoke(Method.java:597)
>> =A0 =A0 =A0 at scala.tools.nsc.Interpreter$Request$$a...
>
> According to your answer, I should get a String ("FOOs") and not an excep=
tion...
> Ideally, I would have expected a collection of String containing "FOOs" a=
nd "BARs"... :)
>
>
>> scala> val i =3D context.iterate("b/name")
>> i: java.util.Iterator[_] =3D org.apache.commons.jxpath.ri.compiler.Expre=
ssion$ValueIterator@3b29642c
>>
>> scala> i.hasNext
>> res30: Boolean =3D false
>
> And even when using the context.iterate method, the returned iterator is =
empty...
>
> Is that ok if I submit my Scala code except within JIRA?
>

It'd probably be best to first verify whether your example (or
something mostly like it) works in Java before proceeding on to
figuring out what, if anything, fails when doing the same thing in
Scala.  I personally don't have any experience with Scala, although
I've been interested to get my feet wet in that regard.

Matt

> Romain
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