请问这两块代码是什么意思, 能详细的说下吗,谢谢

        xstream = new XStream(new DomDriver()){
            @Override
            protected MapperWrapper wrapMapper(MapperWrapper next) {
                return new MapperWrapper(next) {
                    @SuppressWarnings("rawtypes")
                    @Override
                    public boolean shouldSerializeMember(Class definedIn, String fieldName) {
                        if (definedIn == Object.class) {
                            return false;
                        }
                        return super.shouldSerializeMember(definedIn, fieldName);
                    }
                };
            }
        };