Spatial DSL search

ruski42 · **Joined:** Tue Nov 04, 2008 8:53 am **Posts:** 3

Hi,

I am trying to integrate Hibernate Search and lucene spatial using the DSL query api though I am not sure if this is even possible. I am using:

Hibernate Core 3.6.0
Hibernate Search 3.3.0
Lucene Core 3.0.2
Lucene Spatial 3.0.2

I created the annotation for the geohash property as such:

Code:

   @Transient
   @Field(index = Index.UN_TOKENIZED, store = Store.YES, name = "geohash")
   public String getGeohash() {
      return GeoHashUtils.encode(latitude, longitude);
   }   

Now, I wanted to create a query object but I was not sure the best way to go about doing it. This was my last attempt:

Code:

   FullTextSession fullTextSession = Search.getFullTextSession(session);
   DistanceQueryBuilder distanceQueryBuilder = new DistanceQueryBuilder(lat,longitude, distance,"geohash",CartesianTierPlotter.DEFALT_FIELD_PREFIX, true);
        Query query = fullTextSession.createFullTextQuery(new ConstantScoreQuery(distanceQueryBuilder.getFilter()));

This returns no results. Is what I am trying to do possible, or do I need to do the search through the lucene api?

Michael

sanne.grinovero · **Posted:** Sun Dec 19, 2010 7:54 pm

Hi Michael,
it should be possible, but it seems to me that your example is mixing two different techniques to do geolocalization search which are incompatible.

The encoding method is using Geohashtag, and puts the single term result in the field "geohash", but the Query you perform is expecting a different encoding, and also uses prefixed to search across differently named fields.

In case you want to go for the Geohash, then encoding should be fine you only have to review the way you define the Lucene Query; in case you opt for one of the approaches using multiple fields then you have to change the encoding in such a way you create the multiple fields, you need to define an appropriate FieldBridge; Here you can find and example of a FieldBridge encoding a value into multiple fields.

Please correct me if I'm wrong, I didn't look much into Lucene Spatial yet.