public <T> T getMapper(Class<T> type, SqlSession sqlSession) {
    MapperProxyFactory mapperProxyFactory = (MapperProxyFactory)this.knownMappers.get(type);
    if(mapperProxyFactory == null) {
        throw new BindingException("Type " + type + " is not known to the MapperRegistry.");
 } else {
        try {
            return mapperProxyFactory.newInstance(sqlSession);
 } catch (Exception var5) {
            throw new BindingException("Error getting mapper instance. Cause: " + var5, var5);
 }
    }
}

泛型 T的定义