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possym
 Post subject: dynamic hibernate search?
PostPosted: Mon Mar 23, 2009 1:10 pm 
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Joined: Mon Mar 23, 2009 12:46 pm
Posts: 6
recently i implemented hibernate search on a project i'm working on, but then i was asked if there was a way to generalize it. I tried looking online for the answer, but couldn't find anything and thought the search forums would be my best bet.

Currently I create my query like:
Code:
FullTextQuery query = entityManager.createFullTextQuery(luceneQuery, Foo.class, Bar.class);


but I would like to not explicitly name the classes I want to search over. Is there any way to construct the query to get the class information that needs to be search over? Thanks.
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amin-mc
 Post subject:
PostPosted: Tue Mar 24, 2009 4:03 am 
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Joined: Wed Oct 03, 2007 2:31 pm
Posts: 205
Just a thought (not sure this will help much and more for the hibernate Search Team). Would it be possible to do the following:

Code:
FullTextQuery query = entityManager.createFullTextQuery(luceneQuery, org...Entity );


I don't know... I guess it would help people who may forget to put their class in the createFullTextQuery and be wondering why they don't get a result.

It's early in the morning and I haven't had my coffee so I may not be making sense...
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amin-mc
 Post subject:
PostPosted: Tue Mar 24, 2009 4:04 am 
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Posts: 205
Just a thought (not sure this will help much and more for the hibernate Search Team). Would it be possible to do the following:

Code:
FullTextQuery query = entityManager.createFullTextQuery(luceneQuery, org...Indexed);


I don't know... I guess it would help people who may forget to put their class in the createFullTextQuery and be wondering why they don't get a result.

It's early in the morning and I haven't had my coffee so I may not be making sense...
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possym
 Post subject:
PostPosted: Tue Mar 24, 2009 11:59 am 
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Joined: Mon Mar 23, 2009 12:46 pm
Posts: 6
thanks for the reply, but i think i figured it out. I was able to get a set of class names as strings and then i used Class.forName() to convert them into an array of classes. then i just pass in the array of classes instead of the explicit class name and it works.
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amin-mc
 Post subject:
PostPosted: Wed Mar 25, 2009 4:48 am 
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Joined: Wed Oct 03, 2007 2:31 pm
Posts: 205
Hi

Is it possible to see a snippet of code of how you have done this?

Cheers
Amin
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possym
 Post subject:
PostPosted: Wed Mar 25, 2009 10:04 am 
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Joined: Mon Mar 23, 2009 12:46 pm
Posts: 6
sure no problem, but the HibernateUtil is from a framework I'm using so you'll need to get the session another way.

Code:
   Session session = HibernateUtil.getSession(entityManager);
   Map map = session.getSessionFactory().getAllClassMetadata();
   Set<String> entities = map.keySet();
   Iterator<String> entitiesI = entities.iterator();

   Class[] classes = new Class[entities.size()];
   int j=0;
      //converts the set of strings into an array of classes
      try{
         while(entitiesI.hasNext()){
            classes[j] = Class.forName(entitiesI.next());
            j++;
         }
      }catch(ClassNotFoundException cnfe){
         cnfe.printStackTrace();
         numberOfResults = -1;
         return;
      }
........
FullTextQuery query = entityManager.createFullTextQuery(luceneQuery, classes);


that's all you need to do to get the search to work, but there is still an issue with what to do with the results because you get a list of objects and they can be a number of different class types.
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possym
 Post subject:
PostPosted: Wed Mar 25, 2009 11:15 am 
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Joined: Mon Mar 23, 2009 12:46 pm
Posts: 6
sorry for the double post, but i have another question, if I have a couple of classes like

Code:
Foo{
  String name
  String summary
}

Bar{
  String header
  String desc
}


if I put the @Field Annotation in them so the field names are the same (so the field name would be like title and description) would I be access them when I'm going to display the information? I would think this is possible, but I'm not sure how to do it.

I'm talking about something like
Code:
Foo {

  String name;
  String summary;

  @Field(name = "title", index = Index.TOKENIZED)
  String getName(){
    return this.string;
  }
 
  @Field(name = "description", index = Index.TOKENIZED)
  String getSummary(){
    return this.summary
  }

}

Bar {

  String header;
  String desc;

  @Field(name = "title", index = Index.TOKENIZED)
  String getHeader(){
    return this.string;
  }
 
  @Field(name = "description", index = Index.TOKENIZED)
  String getDesc(){
    return this.summary
  }

}


and then i would be able to access the title and description of the objects no matter what their class is. is this possible?
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amin-mc
 Post subject:
PostPosted: Thu Mar 26, 2009 3:59 am 
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Pro

Joined: Wed Oct 03, 2007 2:31 pm
Posts: 205
possym wrote:
sure no problem, but the HibernateUtil is from a framework I'm using so you'll need to get the session another way.

Code:
   Session session = HibernateUtil.getSession(entityManager);
   Map map = session.getSessionFactory().getAllClassMetadata();
   Set<String> entities = map.keySet();
   Iterator<String> entitiesI = entities.iterator();

   Class[] classes = new Class[entities.size()];
   int j=0;
      //converts the set of strings into an array of classes
      try{
         while(entitiesI.hasNext()){
            classes[j] = Class.forName(entitiesI.next());
            j++;
         }
      }catch(ClassNotFoundException cnfe){
         cnfe.printStackTrace();
         numberOfResults = -1;
         return;
      }
........
FullTextQuery query = entityManager.createFullTextQuery(luceneQuery, classes);


that's all you need to do to get the search to work, but there is still an issue with what to do with the results because you get a list of objects and they can be a number of different class types.


Yeah, that was what I was wondering. I guess some kind of annotation to specify what the return type should be...for example:

@Indexed
@SearchResultType (something)

And then the search code could be:

Code:
FullTextQuery query = entityManager.createFullTextQuery(luceneQuery, ..SearchResultType.class);


Under the hood some processor collects the classes marketed with the annotation and populates the code..just an idea..
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