package nu.xss.jpa.dao;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;

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

public abstract class GenericJpaDao<E,K> implements Dao<E,K>, Serializable {
	
	private static final long serialVersionUID = 4998055731089977476L;
	
	@PersistenceContext
	protected EntityManager entityManager;
	
	protected Class<E> entity;
	
	@SuppressWarnings("unchecked")
	public GenericJpaDao() {
		ParameterizedType genericSuperclass = (ParameterizedType) getClass().getGenericSuperclass();
		this.entity = (Class<E>) genericSuperclass.getActualTypeArguments()[1];
	}
	
	public void persist(E entity) {
		entityManager.persist(entity);
		
	}

	public void remove(E entity) {
		entityManager.remove(entity);
	}

	public E findById(K id) {
		return entityManager.find(entity, id);
	}

	public List<E> findAll() {
		// TODO Auto-generated method stub
		return null;
	}

}