Object equality

[Anna Lu]

The code is like this

Genre genreAct = new Genre("Action", "Action");
Genre genreSci = new Genre("Science fiction", "Science fiction");
Genre genreAdv = new Genre("Adventure", "Adventure");

//if I don't save genres, I cannot load them in the following step. Aren't they stored automatically when they are created?
genreAct.save();
genreSci.save();
genreAdv.save();

Movie movie = createMovie("movie3"); //"movie3" is the Id

movie.getGenres().add(genreAct);
movie.getGenres().add(genreSci);
movie.getGenres().add(genreAdv);

Genre g1 = new Genre().load("Action");
Genre g2 = new Genre().load("Science fiction");
Genre g3 = new Genre().load("Adventure");

Collection<Genre> aGenres = movie.getGenres();
for (Genre aGenre: aGenres){
           if (aGenre.equals(g1))
                System.out.println("Action!");
            else if (aGenre.equals(g2))
                System.out.println("Science!");
            else if (aGenre.equals(g3))
                System.out.println("Adventure!");
 }

The output should be
Action!
Science!
Adventure!

But only "Adventure!" was printed out. Do you have any idea? Thanks for your help in advance.

[uoccou]

What is your ID field - when you create the 3 genres are they overwriting each other ?
If you add a check to the end of your loop, for genres that match nothing, do you get any extra output ?

Beans have to be save to your model, otherwise they just exist in the JVM. Doing a load() wont locate them from the model.

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[Taylor Cowan]

No, they are not saved automatically unless you are using the jpa wrapper...ill give a longer answer once im online

Sent from my HTC

---

From: Anna Lu <lyc....@gmail.com>
Sent: 08 July 2010 9:38 AM
To: jenabe...@googlegroups.com
Subject: Object equality

The code is like this

Genre genreAct = new Genre("Action", "Action");
Genre genreSci = new Genre("Science fiction", "Science fiction");
Genre genreAdv = new Genre("Adventure", "Adventure");

//if I don't save genres, I cannot load them in the following step. Aren't they stored automatically when they are created?
genreAct.save();
genreSci.save();
genreAdv.save();

Movie movie = createMovie("movie3"); //"movie3" is the Id

movie.getGenres().add(genreAct);
movie.getGenres().add(genreSci);

[The entire original message is not included]

[Anna Lu]

1. The ID field is defined like
     @Id
    private String Id;
   
    public Genre(String Id, String Name) {
        super();
        this.Name = Name;
        setId(Id);
    }
   
    With differenct Id, I don't think they overwritten each other.

2. There is no extra ouput.

3. I don't understand. If load() couldn't locate them, there should be NotFoundException but there wasn't.

[Anna Lu]

Hi Taylor,

I don't have much knowledge about JPA but we are using Jena SDB.

--

[uoc]

what is your movie class like ? what does createMovie() do ?

[Anna Lu]

public Movie createMovie(String id) {
        Movie movie = new Movie();   
        movie.setId(id);    
        movie.save();
        return movie;
 }

The @id field is the same as Genre,
@Id
private String Id;

[uoc]

Have your overriden Object.equals and hashcode method on genre ? If not
what is happening during your call to equals() in the loop ?

On 09/07/2010 09:21, Anna Lu wrote:
> public Movie createMovie(String id) {
> Movie movie = new Movie();
> movie.setId(id);
> movie.save();
> return movie;
> }
>
> The @id field is the same as Genre,
> @Id
> private String Id;
>
> On Fri, Jul 9, 2010 at 10:14 AM, uoc<uoc...@gmail.com> wrote:
>
>
>> what is your movie class like ? what does createMovie() do ?
>>
>>
>> On 09/07/2010 08:54, Anna Lu wrote:
>>
>> Hi Taylor,
>>
>> I don't have much knowledge about JPA but we are using Jena SDB.
>>
>>
>> On Thu, Jul 8, 2010 at 7:53 PM, Taylor Cowan<thewebs...@gmail.com>wrote:
>>
>>
>>> No, they are not saved automatically unless you are using the jpa
>>> wrapper...ill give a longer answer once im online
>>>
>>> Sent from my HTC
>>>

>>> ------------------------------

>>> From: Anna Lu<lyc....@gmail.com>
>>> Sent: 08 July 2010 9:38 AM
>>> To: jenabe...@googlegroups.com
>>> Subject: Object equality
>>>
>>>
>>> The code is like this
>>>
>>> Genre genreAct = new Genre("Action", "Action");
>>> Genre genreSci = new Genre("Science fiction", "Science fiction");
>>> Genre genreAdv = new Genre("Adventure", "Adventure");
>>>
>>> //if I don't save genres, I cannot load them in the following step. Aren't
>>> they stored automatically when they are created?
>>> genreAct.save();
>>> genreSci.save();
>>> genreAdv.save();
>>>
>>> Movie movie = createMovie("movie3"); //"movie3" is the Id
>>>
>>> movie.getGenres().add(genreAct);
>>> movie.getGenres().add(genreSci);
>>>
>>>
>>> [The entire original message is not included]
>>> --
>>> You received this message because you are subscribed to the Google Groups
>>> "jenabean-dev" group.
>>> To post to this group, send email to jenabe...@googlegroups.com.
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>>> jenabean-dev...@googlegroups.com<jenabean-dev%2Bunsu...@googlegroups.com>

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>>> For more options, visit this group at
>>> http://groups.google.com/group/jenabean-dev?hl=en.
>>>
>>>
>> --

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> From: Taylor Cowan<thewebs...@gmail.com>
> Subject: RE: NotBound Exception ... exists but is not bound to or able to
> coerce as class
> Date: Thu, 8 Jul 2010 11:43:44 -0500
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>
> When working with existing rdf you need 2 help jb bind. You can do this in several ways, see bind() method on RDF2bean
>
> Sent from my HTC
>
> -----Original Message-----
> From: Arthur<arthur...@gmail.com>
> Sent: 08 July 2010 9:25 AM
> To: jenabean-dev<jenabe...@googlegroups.com>
> Subject: NotBound Exception ... exists but is not bound to or able to coerce as class
>
> I am using JenaBeans to access an existing owl model containing an
> instance (of Well) that imports a schema model (containing the Well
> class). I open the instance model, but when I use the RDF2Bean reader
> to load Well instances, it throws an exception. It is finding the
> correct instance (of Well), but it says that it cannot bind or coerce
> to the class (Well). I am sure this is just a configuration issue.
> Any ideas?
>
> Exception in thread "main" thewebsemantic.NotBoundException:
> http://www.objectreservoir.com/owl/2010/04/14/BP/SampleWell#SampleWell
> exists but is not bound to or able to coerce as class
> com.or.orka.jena_reference.Well
> at thewebsemantic.RDF2Bean.javaclass(RDF2Bean.java:528)
> at thewebsemantic.RDF2Bean.newInstance(RDF2Bean.java:496)
> at thewebsemantic.RDF2Bean.applyProperties(RDF2Bean.java:436)
> at thewebsemantic.RDF2Bean.testCycle(RDF2Bean.java:397)
> at thewebsemantic.RDF2Bean.toObject(RDF2Bean.java:393)
> at thewebsemantic.RDF2Bean.loadIndividuals(RDF2Bean.java:178)
> at thewebsemantic.RDF2Bean.loadAll(RDF2Bean.java:172)
> at thewebsemantic.RDF2Bean.load(RDF2Bean.java:156)
> at thewebsemantic.RDF2Bean.load(RDF2Bean.java:123)
> at
> com.or.orka.jena_reference.WorkspaceManager.main(WorkspaceManager.java:
> 55)
>
> Here is the Well Class. I am not mapping to all the properties of
> Well as this is a feasibility test and well has about 30 properties.
> Could that be the issue?
>
> @Namespace("http://www.objectreservoir.com/owl/2010/02/22/well#")
> public class Well {
>
> String name;
> String API;
> @Id
> URI uri;
>
> public Well(URI uri) {
> this.uri = uri;
> }
>
> public String getAPI() {
> return API;
> }
>
> public void setAPI(String API) {
> this.API = API;
> }
>
> public String getName() {
> return name;
> }
>
> public void setName(String name) {
> this.name = name;
> }
>
> public URI getUri() {
> return uri;
> }
>
> public v

[Anna Lu]

Aha! I know what it is now. You are right. I should overrid Object.equals and hashcode to match genres with Id. Genre A equals genre B if their Ids are the same, right?

[uoc]

according to RDF, if IDs are same, yes