package com.gmxt.baseDao.baseDaoImpl;
  
import java.lang.reflect.ParameterizedType;
import java.util.Collections;
import java.util.List;
import javax.annotation.Resource;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.transaction.annotation.Transactional;
import com.gmxt.baseDao.BaseDao;
import com.gmxt.common.Pagination;

@Transactional
@SuppressWarnings("unchecked")
public abstract class BaseDaoImpl<T> implements BaseDao<T> {
    @Resource
    private SessionFactory sessionFactory;
    protected Class<T> clazz;
  
    public BaseDaoImpl() {
        ParameterizedType type = (ParameterizedType) this.getClass()
                .getGenericSuperclass();
        this.clazz = (Class) type.getActualTypeArguments()[0];
    }
  
    public void delete(String id) {
        Object object = (Object) getSession().get(clazz, id);
        getSession().delete(object);
    }
  
    public T getById(String id) {
        return (T) getSession().get(clazz, id);
    }
  
    public List<T> getAll() {
        return getSession().createQuery("from " + clazz.getSimpleName()).list();
    }
  
    public List<T> getByIds(String[] ids) {
        if (ids == null || ids.length == 0) {
            return Collections.EMPTY_LIST;
        }
        return getSession().createQuery(
                "FROM " + clazz.getSimpleName() + " WHERE id IN(:ids)")
                .setParameterList("ids", ids).list();
    }
  
    public int getTotalCount() {
        int totalCount = ((Long)getSession().createQuery("select count(*) from " + clazz.getSimpleName()).list().get(0)).intValue();
        return totalCount;
    }
  
    public String save(T entity) {
        String id = (String) getSession().save(entity);
        return id;
    }
  
    public void update(T entity) {
        getSession().update(entity);
    }
      
    public int update(String hql,Object...field){
        System.out.println(hql);
        for(Object obj : field){
            System.out.println(obj);
        }
        Query query = getSession().createQuery(hql);
        if(field.length != 0){
            for(int i=0 ;i < field.length; i++){
                query.setParameter(i, field[i]);
            }
        }
        return query.executeUpdate();       
    }
  
    public Pagination getPagination(int pageNo, int pageSize) {
        Pagination pagination = new Pagination(pageNo, pageSize,
                getTotalCount());
        List<T> list = getSession()
                .createQuery("from " + clazz.getSimpleName()).setFirstResult(
                        pagination.getFirstResult()).setMaxResults(
                        pagination.getPageSize()).list();
        pagination.setList(list);
        return pagination;
    }
  
    protected Session getSession() {
        return sessionFactory.getCurrentSession();
    }
  
}