cz.muni.fi.dndtroops.dao.UserDaoImpl.java Source code

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Here is the source code for cz.muni.fi.dndtroops.dao.UserDaoImpl.java

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package cz.muni.fi.dndtroops.dao;

import cz.muni.fi.dndtroops.entity.User;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Repository;

/**
 *
 * @author Karel Auf
 */
@Repository
public class UserDaoImpl implements UserDao {

    final static Logger log = LoggerFactory.getLogger(UserDaoImpl.class);

    @PersistenceContext
    private EntityManager em;

    @Override
    public void create(User u) {
        log.debug("create({})", u);
        validate(u);
        if (u.getId() != null) {
            throw new IllegalArgumentException("user id is already set");
        }
        em.persist(u);
    }

    @Override
    public User findById(Long id) {
        log.debug("findById({})", id);
        if (id == null) {
            throw new IllegalArgumentException("id is null");
        }
        return em.find(User.class, id);
    }

    @Override
    public User findByName(String name) {
        log.debug("findByName({})", name);
        if (name == null) {
            throw new IllegalArgumentException("name is null");
        }
        if (name.length() == 0) {
            throw new IllegalArgumentException("name is empty string");
        }
        try {
            TypedQuery<User> query = em.createQuery("SELECT u FROM User u WHERE u.name = :name", User.class);
            return query.setParameter("name", name).getSingleResult();
        } catch (NoResultException nre) {
            return null;
        }
    }

    @Override
    public List<User> findAll() {
        log.debug("findAll({})");
        return em.createQuery("select u from User u", User.class).getResultList();
    }

    @Override
    public void delete(User u) {
        log.debug("delete({})", u);
        if (u == null) {
            throw new IllegalArgumentException("user pointer is null");
        }
        em.remove(u);
    }

    private static void validate(User u) {
        if (u == null) {
            throw new IllegalArgumentException("user pointer is null");
        }
        if (u.getName() == null) {
            throw new IllegalArgumentException("user name is null");
        }
        if (u.getPasswdHash() == null) {
            throw new IllegalArgumentException("user password is null");
        }
    }

}