Add setter for mybatisMapperRegistry to support @DataPermission extensions

[weihuanwan]

We plan to add an extension to MyBatis to handle the @DataPermission annotation on each Mapper's mappedStatement. Currently, mybatisMapperRegistry in MybatisConfiguration does not provide a set method, so it is not possible to directly customize the registry to store annotation information. At present, the only feasible approach is to modify this property via reflection, which is not very elegant. Could a setMybatisMapperRegistry method be provided in a future version to allow more flexible extensions?

public class DataPermissionConfigurationCustomizer implements ConfigurationCustomizer {

    /**
     * Customize the given a {@link MybatisConfiguration} object.
     *
     * @param configuration the configuration object to customize
     */
    @Override
    public void customize(MybatisConfiguration configuration) {

        try {
            Field field = MybatisConfiguration.class.getDeclaredField("mybatisMapperRegistry");
            field.setAccessible(true);
            MapperRegistry original = (MapperRegistry) field.get(configuration);

            // 替换为我们自己的
            DataPermissionMybatisMapperRegistry custom = new DataPermissionMybatisMapperRegistry(configuration);
            field.set(configuration, custom);

            System.out.println("✅ MybatisMapperRegistry 已替换为 DataPermissionMapperRegistry");
        } catch (Exception e) {
            throw new RuntimeException("替换 MapperRegistry 失败", e);
        }
    }
}
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