Examples of org.hibernate.sql.ast.origin.hql.resolve.LuceneJPQLWalker

org.hibernate.sql.ast.origin.hql.resolve.LuceneJPQLWalker

This extends the ANTLR generated AST walker to transform a parsed tree into a Lucene Query and collect the target entity types of the query.
TODO:

It is currently human-written but should evolve into another ANTLR generated tree walker, not extending GeneratedHQLResolver but using its output as a generic normalization AST transformer.

We are assembling the Lucene Query directly, but this doesn't take into account parameter types which might need some transformation; the Hibernate Search provided {@link QueryBuilder} could do this.

Implement more predicates

Support multiple types being targeted by the Query

Support positional parameters (currently only consumed named parameters)

      treeStream.setTokenStream( tokens );
      EntityNamesResolver entityNamesResolver = getDefinedEntityNames( session.getSessionFactory() );
      FullTextSession fullTextSession = Search.getFullTextSession( session );
      SearchFactoryImplementor searchFactory = (SearchFactoryImplementor) fullTextSession.getSearchFactory();
      // Finally create the treewalker:
      LuceneJPQLWalker walker = new LuceneJPQLWalker( treeStream, searchFactory, entityNamesResolver, namedParameters );
      walker.statement();
      org.apache.lucene.search.Query luceneQuery = walker.getLuceneQuery();
      Class targetEntity = walker.getTargetEntity();
      FullTextQuery fullTextQuery = fullTextSession.createFullTextQuery( luceneQuery, targetEntity );
      //Following options are mandatory to load matching entities without using a query
      //(chicken and egg problem)
      fullTextQuery.initializeObjectsWith( ObjectLookupMethod.SKIP, DatabaseRetrievalMethod.FIND_BY_ID );
      return fullTextQuery;

Examples of org.hibernate.sql.ast.origin.hql.resolve.LuceneJPQLWalker

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