package net.ramapuram.thomas.dao.hibernate;
   
   import net.ramapuram.thomas.dao.UserDao;
   import net.ramapuram.thomas.model.User;
   import org.springframework.core.annotation.AnnotationUtils;
   import org.springframework.jdbc.core.simple.SimpleJdbcTemplate;
   import org.springframework.orm.hibernate3.SessionFactoryUtils;
   import org.springframework.security.core.userdetails.UserDetails;
   import org.springframework.security.core.userdetails.UserDetailsService;
  import org.springframework.security.core.userdetails.UsernameNotFoundException;
  import org.springframework.stereotype.Repository;
  
  import javax.persistence.Table;
  import java.util.List;
  
  /**
   * This class interacts with Spring's HibernateTemplate to save/delete and
   * retrieve User objects.
   *
   * @author <a href="mailto:matt@raibledesigns.com">Matt Raible</a>
   *   Modified by <a href="mailto:dan@getrolling.com">Dan Kibler</a>
   *   Extended to implement Acegi UserDetailsService interface by David Carter david@carter.net
   *   Modified by <a href="mailto:bwnoll@gmail.com">Bryan Noll</a> to work with 
   *   the new BaseDaoHibernate implementation that uses generics.
  */
  @Repository("userDao")
  public class UserDaoHibernate extends GenericDaoHibernate<User, Long> implements UserDao, UserDetailsService {
  
      /**
       * Constructor that sets the entity to User.class.
       */
      public UserDaoHibernate() {
          super(User.class);
      }
  
      /**
       * {@inheritDoc}
       */
      @SuppressWarnings("unchecked")
      public List<User> getUsers() {
          return getHibernateTemplate().find("from User u order by upper(u.username)");
      }
  
      /**
       * {@inheritDoc}
       */
      public User saveUser(User user) {
          if (log.isDebugEnabled()) {
              log.debug("user's id: " + user.getId());
          }
          getHibernateTemplate().saveOrUpdate(user);
          // necessary to throw a DataIntegrityViolation and catch it in UserManager
          getHibernateTemplate().flush();
          return user;
      }
  
      /**
       * Overridden simply to call the saveUser method. This is happenening 
       * because saveUser flushes the session and saveObject of BaseDaoHibernate 
       * does not.
       *
       * @param user the user to save
       * @return the modified user (with a primary key set if they're new)
       */
      @Override
      public User save(User user) {
          return this.saveUser(user);
      }
  
      /** 
       * {@inheritDoc}
      */
      public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
          List users = getHibernateTemplate().find("from User where username=?", username);
          if (users == null || users.isEmpty()) {
              throw new UsernameNotFoundException("user '" + username + "' not found...");
          } else {
              return (UserDetails) users.get(0);
          }
      }
  
      /** 
       * {@inheritDoc}
      */
      public String getUserPassword(String username) {
          SimpleJdbcTemplate jdbcTemplate =
                  new SimpleJdbcTemplate(SessionFactoryUtils.getDataSource(getSessionFactory()));
          Table table = AnnotationUtils.findAnnotation(User.class, Table.class);
          return jdbcTemplate.queryForObject(
                  "select password from " + table.name() + " where username=?", String.class, username);
  
      }
      
  }