代码之家 › 专栏 › 技术社区 › declan roche

使用mapstruct如何使用弹簧组件映射器将对象映射到对象列表

mapstruct

declan roche · 技术社区 · 7 年前

我试图将一个对象A映射到对象B的列表。

例如,我尝试了许多不同的方法尝试使用“表达式”创建包含一个对象a的列表和“qualifiedByName”,但这不起作用,因为我认为当您使用表达式/限定名时,您不能使用

我还尝试使用@aftermapper方法调用映射器地图绘制者。获取目标映射器的句柄未填充的位置。后映射中的映射使我可以用源代码调用目标映射器然后将目标添加到列表中。所以我希望是从映射器中获取映射器组件句柄的另一种方法。

我所有的地图绘制者都使用 @Mapper(componentModel="spring",

欢迎所有建议

当做

    // SPECIESTOLOGSPECY.JAVA
    // From this mapper I want to call SpecyToLogDeclarationMapperApi mapper
    // to map âspeciesâ to âlogdeclarationsâ which is a list of logdeclaration
    // you can see want I am trying to do in the aftermapping method
    // where I map species to logdeclaration and then put this into a list
    // unfortunately I need other mapping components (ConfigMapperFromCode & SpecyToFishDeclarationMapperApi)
    // to be autowired into  SpecyToLogDeclarationMapperApi and this is not happening.
    // is there another way to get a handle to the spring managed 
    // SpecyToLogDeclarationMapperApi mapper ?

     @Mapper(componentModel="spring",
     uses = {
         ConfigMapperFromCode.class, 
         GeoInfoMapper.class,
         SpecyToLogDeclarationMapperApi.class
            })
     public interface SpeciesToLogSpecy {
     SpecyToLogDeclarationMapperApi MAPPER = Mappers.getMapper(SpecyToLogDeclarationMapperApi.class);

@Mappings(
        {
            @Mapping(target="createdate", expression = "java(java.sql.Timestamp.valueOf(java.time.LocalDateTime.now()))"),
            @Mapping(target="speciesid", qualifiedByName={"ConfigMapperFromCode", "speciesIdFromCodeAsDecimal"},  source = "species.speciesCode"),
            @Mapping(target="unitweight", constant = "1"),
            @Mapping(target = "inactiveind", constant = "N"),
            @Mapping(target = "unitdefaultind", constant = "Y"),
            @Mapping(target = "sectiontypeid", expression = "java(new BigDecimal(ie.gov.agriculture.fisheries.logsheet.mapping.constants.MappingConstants.LOG_SPECIES_SECTION_TYPE_SHEETDECLARATION))"),
            @Mapping(target = "unituomid", expression = "java(new BigDecimal(ie.gov.agriculture.fisheries.logsheet.mapping.constants.MappingConstants.LOGSHEET_CATCHUNITS_KG))"),
            @Mapping(target="catchtypeid",  qualifiedByName={"ConfigMapperFromCode", "returnCatchTypeId"},  source = "species.spType"),
            @Mapping(target="legalfishsizetypeid",  qualifiedByName={"ConfigMapperFromCode", "legalFishSizeTypeIdFromCode"},  source = "species.fishSizeClass"),
            @Mapping(target="presenttypeid",  qualifiedByName={"ConfigMapperFromCode", "presentationTypeIdFromCode"},  source = "species.presentation.presentationType"),
            //@Mapping(target="logdeclarations", source = "species")                
        }           
         )
Logspecy speciesToLogspecy(Species species, @Context ExtraFields extraFields);


    @AfterMapping
    default void afterMap(@MappingTarget Logspecy logspecy, @Context ExtraFields extraFields){
    Logdeclaration logDeclaration = MAPPER.SpeciesToLogDeclarations(species, extraFields);

    List<Logdeclaration> logdeclarations = new ArrayList<Logdeclaration>(); 
    logdeclarations.add(logDeclaration);
    logSpecy.setLogdeclarations(logdeclarations);    
    {




    // SPECYTOLOGDECLARATIONMAPPERAPI.JAVA



    @Mapper(componentModel="spring",
    uses = {
        ConfigMapperFromCode.class,
        SpecyToFishDeclarationMapperApi.class       
        }    
)
public interface SpecyToLogDeclarationMapperApi {


@Mappings(
        {
            @Mapping(target="createdate", expression = "java(java.sql.Timestamp.valueOf(java.time.LocalDateTime.now()))"),              
            @Mapping(target="geartypeid", qualifiedByName={"ConfigMapperFromCode", "gearIdFromCode"},  source = "species.gearType"),
            @Mapping(target="fishcount", source = "species.qty"),
            @Mapping(target = "inactiveind", constant = "N"),
            @Mapping(target="packagetypeid", qualifiedByName={"ConfigMapperFromCode", "packagingTypeIdFromCode"},  source = "species.presentation.packaging"),
            @Mapping(target="packagecount", source = "species.presentation.pkgunit"),
            @Mapping(target="avgpackageweight", source = "species.presentation.pkgUnitWeight"),
            @Mapping(target="conversionfactor", source = "species.presentation.convFactor"),
            @Mapping(target="fishdeclaration", source = "species.geoInfo")              
        }           
        )
Logdeclaration SpeciesToLogDeclarations (Species species, @Context ExtraFields extraFields);

1 回复 | 直到 7 年前

Filip 7 年前

问题是您正在尝试映射 Species List<Logdeclaration> MapStruct找不到这种映射方法。为了使其工作,您可以将以下方法添加到 SpecyToLogDeclarationMapperApi

default List<Logdeclaration> SpeciesToLogDeclarationsToList(Species species, @Context ExtraFields extraFields) {
    if ( species == null ) {
        return null;
    }

    Logdeclaration logDeclaration = SpeciesToLogDeclarations(species, extraFields);

    List<Logdeclaration> logdeclarations = new ArrayList<Logdeclaration>();
    logdeclarations.add(logDeclaration);
    return logdeclarations;
}

我认为您可以做一些额外的事情来改进代码并“更正确地”使用MapStruct:

Mappers#getMapper(Class) 当组件模型不是 default
如果不想在表达式中使用FQN,可以使用 Mapper#imports MapStruct将在实现中导入它们。
如果只有一个源参数,则不必在映射中使用它的名称

例如

@Mapping(target="fishcount", source = "species.qty")

@Mapping(target="fishcount", source = "qty")