@Override
 public <T extends GettableById> List<T> get(
     Class<T> bookEntityClass,
     int from,
     int to,
     Map<String, List<Criterion>> restrictions,
     OrderByFilter filter) {
   validateTransaction();
   Criteria criteria = getSession().createCriteria(bookEntityClass);
   criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
   criteria.setFirstResult(from);
   if (to != 0) criteria.setMaxResults(to);
   for (String key : restrictions.keySet()) {
     if (key.equals(RestrictionsFields.MAIN_RESTRICTIONS)) {
       for (Criterion restriction : restrictions.get(RestrictionsFields.MAIN_RESTRICTIONS))
         criteria.add(restriction);
     } else if (restrictions.get(key).size() > 0) {
       Criteria c = criteria.createCriteria(key);
       for (Criterion restriction : restrictions.get(key)) c.add(restriction);
     }
   }
   if (filter != null) {
     if (filter.getDirection().equals(OrderByFilter.ASC))
       criteria.addOrder(Order.asc(filter.field));
     else criteria.addOrder(Order.desc(filter.field));
   }
   return criteria.list();
 }
 @Override
 public <T extends GettableById> Number count(Class<T> currentClass, Criterion... restrictions) {
   validateTransaction();
   Criteria criteria = getSession().createCriteria(currentClass);
   criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
   criteria.setProjection(Projections.rowCount());
   for (Criterion restriction : restrictions) criteria.add(restriction);
   return ((Number) criteria.uniqueResult());
 }
 @Override
 public <T extends GettableById> Collection<Integer> getIds(
     Class<T> currentClass, Criterion... restrictions) {
   validateTransaction();
   Criteria criteria = getSession().createCriteria(currentClass);
   criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
   criteria.setProjection(Projections.id());
   for (Criterion restriction : restrictions) criteria.add(restriction);
   return criteria.list();
 }
  private <P> Criteria buildProjectionCriteria(
      Class<P> projectClass, Criteria criteria, Projection projections, boolean distinctResult) {
    if (distinctResult) {
      criteria.setProjection(Projections.distinct(projections));
    } else {
      criteria.setProjection(projections);
    }

    return criteria.setResultTransformer(Transformers.aliasToBean(projectClass));
  }
 @Override
 public <T extends GettableById> List<T> get(
     Class<T> bookEntityClass, int from, int to, Criterion... restrictions) {
   validateTransaction();
   Criteria criteria = getSession().createCriteria(bookEntityClass);
   criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
   criteria.setFirstResult(from);
   if (to != 0) criteria.setMaxResults(to);
   for (Criterion restriction : restrictions) criteria.add(restriction);
   return criteria.list();
 }
 @Override
 public <T extends GettableById> List<T> get(
     Class<T> bookEntityClass, int from, int to, OrderByFilter filter) {
   validateTransaction();
   Criteria criteria = getSession().createCriteria(bookEntityClass);
   criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
   criteria.setFirstResult(from);
   if (to != 0) criteria.setMaxResults(to);
   if (filter != null) {
     if (filter.getDirection().equals(OrderByFilter.ASC))
       criteria.addOrder(Order.asc(filter.field));
     else criteria.addOrder(Order.desc(filter.field));
   }
   return criteria.list();
 }
 @Override
 public <T extends GettableById> Number count(
     Class<T> currentClass, Map<String, List<Criterion>> restrictions) {
   validateTransaction();
   Criteria criteria = getSession().createCriteria(currentClass);
   criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
   criteria.setProjection(Projections.rowCount());
   for (String key : restrictions.keySet()) {
     if (key.equals(RestrictionsFields.MAIN_RESTRICTIONS)) {
       for (Criterion restriction : restrictions.get(RestrictionsFields.MAIN_RESTRICTIONS))
         criteria.add(restriction);
     } else if (restrictions.get(key).size() > 0) {
       Criteria c = criteria.createCriteria(key);
       for (Criterion restriction : restrictions.get(key)) c.add(restriction);
     }
   }
   return ((Number) criteria.uniqueResult());
 }
 @Override
 public <T extends GettableById> List<T> get(
     Class<T> bookKeywordEntityClass,
     String bookKeywordEntity,
     int offset,
     int limit,
     HashMap<String, FetchMode> fetchMode,
     HashMap<String, String> alias,
     Criterion... criterions) {
   validateTransaction();
   Criteria criteria = getSession().createCriteria(bookKeywordEntityClass, bookKeywordEntity);
   criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
   criteria.setFirstResult(offset);
   if (limit != 0) criteria.setMaxResults(limit);
   for (Criterion restriction : criterions) criteria.add(restriction);
   for (Map.Entry<String, FetchMode> stringObjectEntry : fetchMode.entrySet()) {
     criteria.setFetchMode(stringObjectEntry.getKey(), stringObjectEntry.getValue());
   }
   for (Map.Entry<String, String> stringObjectEntry : alias.entrySet()) {
     criteria.createAlias(stringObjectEntry.getKey(), stringObjectEntry.getValue());
   }
   return criteria.list();
 }