具有条件和 nullValuePropertyMappingStrategy 的 Mapstruct 映射

Question

如果标题不清楚，我很抱歉，让我通过示例代码说明一下：

UpdateProfileDto

public class UpdateProfileDto {

    @NotEmpty
    private String firstName;

    @NotEmpty
    private String lastName;

    @Size(max = 20)
    private String currentPassword;

    @Size(max = 20)
    private String newPassword;

    @Size(max = 20)
    private String confirmNewPassword;

    // getters and setters
}

编码映射

@Qualifier
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.CLASS)
public @interface EncodedMapping {
}

密码编码器映射器

public class PasswordEncoderMapper {
    protected final PasswordEncoder passwordEncoder;

    public PasswordEncoderMapper(PasswordEncoder passwordEncoder) {
        this.passwordEncoder = passwordEncoder;
    }

    @EncodedMapping
    public String encode(String value) {
        return passwordEncoder.encode(value);
    }
}

用户映射器

@Mapper(config = MapperConfig.class, componentModel = "spring", uses = PasswordEncoderMapper.class)
public interface UserMapper {

    @Mappings({
            @Mapping(target = "firstName", source = "firstName"),
            @Mapping(target = "lastName", source = "lastName"),
            @Mapping(target = "fullName", expression = "java(user.getFirstName() + \" \" + user.getLastName())"),
            @Mapping(target = "password",
                    source = "newPassword",
                    nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE,
                    qualifiedBy = EncodedMapping.class)
    })
    void updateUserFromDto(UpdateUserProfileDto updateUserProfileDto, @MappingTarget User user);
}

生成的 UserMapperImpl

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2020-03-11T13:51:34+0800",
    comments = "version: 1.3.0.Final, compiler: javac, environment: Java 1.8.0_231 (Oracle Corporation)"
)
@Component
public class UserMapperImpl implements UserMapper {

    @Autowired
    private PasswordEncoderMapper passwordEncoderMapper;

    @Override
    public void updateUserFromDto(UpdateUserProfileDto updateUserProfileDto, User user) {
        if ( updateUserProfileDto == null ) {
            return;
        }

        if ( updateUserProfileDto.getFirstName() != null ) {
            user.setFirstName( updateUserProfileDto.getFirstName() );
        }
        else {
            user.setFirstName( null );
        }
        if ( updateUserProfileDto.getLastName() != null ) {
            user.setLastName( updateUserProfileDto.getLastName() );
        }
        else {
            user.setLastName( null );
        }
        if ( updateUserProfileDto.getNewPassword() != null ) {
            user.setPassword( passwordEncoderMapper.encode( updateUserProfileDto.getNewPassword() ) );
        }

        user.setFullName( user.getFirstName() + " " + user.getLastName() );
    }
}

从生成的UserMapperImpl 中，我不仅要检查newPassword 是否有值...，还要检查currentPassword 和newPassword 是否有值并继续user.setPassword()。

我的意思是这样的：

...
if ( updateUserProfileDto.getCurrentPassword() != null && updateUserProfileDto.getNewPassword() != null ) {
    user.setPassword( passwordEncoderMapper.encode( updateUserProfileDto.getNewPassword() ) );
}
...

问题

如何更改我的映射器接口UserMapper，以便在设置目标user.password 之前检查currentPassword 和newPassword，并且仍将使用PasswordEncoderMapper.encode(password)？

如果我尝试使用expression 而不是source 并检查currentPassword 和newPassword 是否都有值，然后将user.password 设置为newPassword。否则，它不会对user.password使用NullValuePropertyMappingStrategy做任何事情...但似乎不允许混合expression和NullValuePropertyMappingStrategy。

谢谢！

Answer 1

我会从以下方法开始

@Mapper(config = MapperConfig.class, componentModel = "spring")
public abstract class UserMapper { // using class instead of interface to be able to inject beans

    @Autowired
    private PasswordEncoderMapper passwordEncoderMapper;

    @Mappings({
            // your non-password mappings
    })
    void updateUserFromDto(UpdateUserProfileDto updateUserProfileDto, @MappingTarget User user);


    @AfterMapping
    void setPassword(UpdateUserProfileDto updateUserProfileDto, @MappingTarget User user) {
        if (updateUserProfileDto.getCurrentPassword() != null && updateUserProfileDto.getNewPassword() != null) {
            user.setPassword(passwordEncoderMapper.encode( updateUserProfileDto.getNewPassword()));
        }
    }
}