UserDaoImpl.java

/*
 * Copyright 2012
 * Ubiquitous Knowledge Processing (UKP) Lab and FG Language Technology
 * Technische Universität Darmstadt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.tudarmstadt.ukp.clarin.webanno.security;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;

import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import de.tudarmstadt.ukp.clarin.webanno.security.model.User;

/**
 * Implementation of methods defined in the {@link UserDao} interface
 *
 *
 */
@Repository
public class UserDaoImpl
	implements UserDao
{
	@PersistenceContext
	private EntityManager entityManager;

	@Override
	@Transactional
	public boolean exists(final String aUsername)
	{
		return entityManager
				.createQuery("FROM " + User.class.getName() + " o WHERE o.username = :username")
				.setParameter("username", aUsername).getResultList().size() > 0;
	}

	   @Override
    @Transactional
	    public void create(User aUser)
	    {
	        entityManager.persist(aUser);
	        entityManager.flush();
	    }

	    @Override
        @Transactional
	    public User update(User aUser)
	    {
	        return entityManager.merge(aUser);
	    }

	@Override
	@Transactional
	public int delete(String aUsername)
	{
		User toDelete = get(aUsername);
		if (toDelete == null) {
			return 0;
		}
		else {
			delete(toDelete);
			return 1;
		}
	}

	@Override
	@Transactional
	public void delete(User aUser)
	{
		entityManager.remove(entityManager.merge(aUser));
	}

	@Override
    @Transactional(noRollbackFor = NoResultException.class)
	public User get(String aUsername)
	{
		if (!exists(aUsername)) {
			return null;
		}
		return entityManager
				.createQuery("FROM " + User.class.getName() + " o WHERE o.username = :username",
						User.class).setParameter("username", aUsername).getSingleResult();
	}

	@Override
	@Transactional
	public List<User> list()
	{
		return entityManager.createQuery("FROM " + User.class.getName(), User.class)
				.getResultList();
	}
}