create a Document index from 2 enitities using lucene + ejb3

sergiu72 · **Joined:** Tue Oct 10, 2006 2:38 pm **Posts:** 17

What is the best way to create a Document indexed having info from more than one entities? Having this 2 classes is it possible to create a Document having from ParentEntity name , and from ChildEntity info and id when have insert event in ChildEntity?

maybe adjusting add method from LuceneEventListener?

thanks for any ideea

Code:

@Entity
public class ParentEntity {
   private int id;
   private String name;
   private ChildEntity child;
   
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Keyword(id=true)
    public int getId () {
         return id;
    }
    
    public void setId (int id) {
        this.id = id;
    }


    public void setName(String name) {
      this.name = name;
   }

    public String getName() {
      return name;
   }

   public void setChild(ChildEntity child) {
      this.child = child;
   }

   @OneToMany
   @JoinColumn(name = "data")
   public ChildEntity getChild() {
      return child;
   }

}

Code:

@Entity
@Indexed(index="luceneIndex/test")
public class ChildEntity {
   private int id;
   private String info;
   private ParentEntity parent;
   
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Keyword(id=true)
    public int getId () {
         return id;
    }
    
    public void setId (int id) {
        this.id = id;
    }

   public void setInfo(String info) {
      this.info = info;
   }

   @Text(name = "info")
   public String getInfo() {
      return info;
   }

   public void setParent(ParentEntity parent) {
      this.parent = parent;
   }

   @OneToMany(mappedBy="data")
   public ParentEntity getParent() {
      return parent;
   }


}

emmanuel · **Posted:** Tue Oct 17, 2006 4:44 pm

you mean one document containing information of both classes and returning the child id?
You can do that with @FieldBridge but this is only in the lucene integration branch http://anonsvn.jboss.org/repos/hibernate/branches/Lucene_Integration/

I haven't documented that stuff yet,a nd still polishing some area. But I'm interested to hear from your feedback

puccio · **Posted:** Thu Oct 19, 2006 8:17 am

Hi,

I see you want to map the ChildEntity class to a Lucene Document, and you want to add fields with datas from the ParentEntity, right?

So, basically you can add the getter for the ParentEntiti name to the ChildEntity, to make it goes into the Lucene Index, like this:

Code:

@Entity
@Indexed(index="luceneIndex/test")
public class ChildEntity { 
   
  // ..
  // stuff in your previous message
  // ..


   @Transient
   @Text(name="name")
   protected String getName() {
       return this.parent.getName()
   }   
  
}

@Transient is needed otherwise this property gets mapped into the database also.

I know, it's a little hack, but it works :-)

sergiu72 · **Joined:** Tue Oct 10, 2006 2:38 pm **Posts:** 17

thanks for all help

I get another solution to fix my problem in the meantime, not as nice as yours.

I created a new class, having same code as org.hibernate.lucene.event.LuceneEventListener, except adding this

Code:

.   private void add(final Object entity, final DocumentBuilder<Object> builder, final Serializable id) {
      Document doc = builder.getDocument( entity, id );
      hack(entity,doc);//<-----
.....}

   protected void hack(Object entity, Document doc) {
//this method will be called in any class who extends this hacked class
   }


      

emmanuel · **Posted:** Wed Oct 25, 2006 10:50 am

FYI, I'm not gonna apply such a patch ;-)