/Hibernate Search Annotations.
@AnalyzerDef(name = "ngram",tokenizer = @TokenizerDef(factory =  StandardTokenizerFactory.class),
filters = {
@TokenFilterDef(factory = StandardFilterFactory.class),//Remove dots from acronyms and 's from words
@TokenFilterDef(factory = LowerCaseFilterFactory.class),//Lowercases all words
@TokenFilterDef(factory = StopFilterFactory.class),//Remove words (tokens) matching a list of stop words
@TokenFilterDef(factory = SnowballPorterFilterFactory.class,
params = {@Parameter(name = "language", value = "English")}),//Reduces a word to it's root in a given language. (eg. protect, protects, protection share the same root). Using such a filter allows searches matching related words.
@TokenFilterDef(factory =SynonymFilterFactory.class,
// expand all synonyms in the token stream
params = {@Parameter(name="expand",value="true")})
})

@Entity
@Table(name="CategoryMapping",catalog="dbname")
@Indexed
public class CategoryMapping  implements Serializable{
   
   /**
    *
    */
   private static final long serialVersionUID = 1L;

   @Id
   @GeneratedValue
   @Column(name="sno" , nullable=false)
   private BigInteger sno;
   
   @Column(name="product_type", nullable=false)
   //@Field(index=Index.TOKENIZED,store=Store.YES)
   @Field(index=Index.TOKENIZED,analyzer=@Analyzer(definition="ngram"),store=Store.YES)
   private String product_type;
   
   @Column(name="category", nullable=false)
   //@Field(index=Index.TOKENIZED,store=Store.YES)
   @Field(index=Index.TOKENIZED,analyzer=@Analyzer(definition="ngram"),store=Store.YES)
   private String category;
   

   /**
    * @return the sno
    */
   public BigInteger getSno() {
      return sno;
   }

   /**
    * @param sno the sno to set
    */
   public void setSno(BigInteger sno) {
      this.sno = sno;
   }

   /**
    * @return the product_type
    */
   public String getProduct_type() {
      return product_type;
   }

   /**
    * @param product_type the product_type to set
    */
   public void setProduct_type(String product_type) {
      this.product_type = product_type;
   }

   /**
    * @return the category
    */
   public String getCategory() {
      return category;
   }

   /**
    * @param category the category to set
    */
   public void setCategory(String category) {
      this.category = category;
   }
}

/**
    * This method Indexes the CategoryMapping database.
    */
   @Transactional(propagation=Propagation.REQUIRED,isolation=Isolation.REPEATABLE_READ)
   public void indexCategoryMapping()throws HibernateException,NullPointerException,ParseException,
   Exception{

      logger.info("Indexing CategoryMapping Database.......");
      Session   session=null;
      FullTextSession fullTextSession=null;

      //Getting current session object.
      session=sessionFactory.getCurrentSession();

      if(session==null){
         logger.info("session is null in IndexCategoryMapping");
         throw new NullPointerException();
      }

      //Creating 'fullTextSession' Object.
      fullTextSession = Search.getFullTextSession(session);

      if(fullTextSession==null){
         logger.info("fullTextSession is null in IndexCategoryMapping");
         throw new NullPointerException();
      }
      @SuppressWarnings("unchecked")
      List<CategoryMapping> categories = session.createQuery("from CategoryMapping as cm").list();
      
      for (CategoryMapping cm : categories) {
         fullTextSession.index(cm);
      }
   }