package com.epam.dao.hiberhate;

import java.lang.reflect.ParameterizedType;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;

import com.epam.dao.BaseDao;

@SuppressWarnings("unchecked")
public abstract class GenericDao<T> implements BaseDao<T> {

    @Autowired
    protected SessionFactory sessionFactory;

    private Class<?> getEntityClass() {
        return ((Class) ((ParameterizedType) getClass().getGenericSuperclass())
                .getActualTypeArguments()[0]);
    }

    public T get(Integer id) {
        return (T) sessionFactory.getCurrentSession()
                .get( getEntityClass(), id );
    }

    public T save(T entity) {
        Integer id = (Integer) sessionFactory.getCurrentSession().save( entity );
        return (T) sessionFactory.getCurrentSession()
                .get( getEntityClass(), id );
    }

    public T update(T entity) {
        sessionFactory.getCurrentSession().update( entity );
        return entity;
    }

    public void delete(T entity) {
        sessionFactory.getCurrentSession().delete( entity );
    }

    public void delete(Integer id) {
        T entity = (T) sessionFactory.getCurrentSession().get(
                getEntityClass(), id );
        sessionFactory.getCurrentSession().delete( entity );
    }

}