package com.xg.ssh2.dao.impl;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;

import org.hibernate.criterion.DetachedCriteria;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.xg.ssh2.dao.IBaseDao;


/**
 * 基础DAO实现类 实现基本CRUD等功能
 * 
 * @author xg
 * @version 1.0
 * @date 2012-12-29
 * @param <T>
 */
public class BaseDaoImpl<T extends Serializable> extends HibernateDaoSupport
		implements IBaseDao<T> {

	/**
	 * 泛型的具体类型
	 */
	protected Class<T> entityClass;

	public BaseDaoImpl() { // 根据实例类自动获取实体类类型
		this.entityClass = null;
		Class c = getClass();
		Type t = c.getGenericSuperclass();
		if (t instanceof ParameterizedType) {
			Type[] p = ((ParameterizedType) t).getActualTypeArguments();
			this.entityClass = (Class<T>) p[0];
		}
	}

	@Override
	public void delete(T entity) {
		getHibernateTemplate().delete(entity);
	}

	@Override
	public T get(Serializable id) {
		if (id != null) {
			return (T) getHibernateTemplate().get(entityClass, id);
		}
		return null;
	}

	@Override
	public Collection<T> queryAll() {
		DetachedCriteria detached = DetachedCriteria.forClass(entityClass);
		return this.getHibernateTemplate().findByCriteria(detached);
	}

	@Override
	public void save(T entity) {
		getHibernateTemplate().save(entity);
	}

	@Override
	public void update(T entity) {
		getHibernateTemplate().update(entity);
	}

}