[英]Extends a class(which implements interface) and implements same interface doesn't require method defination in class?
[英]DTOs and entities which implements the same interface
我有下一個 Maven 項目:
我打算從項目模型中刪除 JPA 實體,只在那里放置 DTO 的 pojo 和接口,並將我的 JPA 實體放在其余項目中,以便從項目模型中刪除 jpa 依賴項。 這是因為我不想在project-android 、 project-web和project-desktop 中有 JPA 依賴項。
我正在考慮遵循下一個架構:
@JsonSerialize(as=CountryDto.class)
@JsonDeserialize(as=CountryDto.class)
public interface ICountry extends Serializable
{}
@Entity
@Table(name = "COUNTRY")
@JsonSerialize(as=Country.class)
@JsonDeserialize(as=Country.class)
public class Country implements ICountry
{}
public class CountryDto implements ICountry
{}
如果我需要從實體轉換為 DTO,請使用 mapstruct 或 Selma。
但我不確定這是否是最佳實踐,因為我的代碼中存在如下問題:
@JsonSerialize(as=CityDto.class)
@JsonDeserialize(as=CityDto.class)
public interface ICity extends Serializable
{
public Integer getIdCity();
public void setIdCity(Integer idCity);
public String getName();
public void setName(String name);
public ICountry getCountryId();
public void setCountryId(ICountry countryId);
}
public class CityDto implements ICity
{
private static final long serialVersionUID = -6960160473351421716L;
private Integer idCity;
private String name;
private CountryDto countryId;
public CityDto()
{
// TODO Auto-generated constructor stub
}
public CityDto(Integer idCity, String name, CountryDto countryId)
{
super();
this.idCity = idCity;
this.name = name;
this.countryId = countryId;
}
public CityDto(Integer idCity, String name)
{
super();
this.idCity = idCity;
this.name = name;
}
@Override
public Integer getIdCity()
{
return idCity;
}
@Override
public void setIdCity(Integer idCity)
{
this.idCity = idCity;
}
@Override
public String getName()
{
return name;
}
@Override
public void setName(String name)
{
this.name = name;
}
@Override
public ICountry getCountryId()
{
return countryId;
}
@Override
public void setCountryId(ICountry countryId)
{
this.countryId = (CountryDto) countryId;
}
}
@Entity
@Table(name = "CITY")
@JsonSerialize(as=City.class)
@JsonDeserialize(as=City.class)
public class City implements ICity
{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "ID_CITY")
private Integer idCity;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 100)
@Column(name = "NAME")
private String name;
@JoinColumn(name = "COUNTRY_ID", referencedColumnName = "ID_COUNTRY")
@ManyToOne(optional = false)
private Country countryId;
private static final long serialVersionUID = 1L;
public City()
{
}
public City(Integer idCity)
{
this.idCity = idCity;
}
public City(Integer idCity, String name)
{
this.idCity = idCity;
this.name = name;
}
@Override
public Integer getIdCity()
{
return idCity;
}
@Override
public void setIdCity(Integer idCity)
{
this.idCity = idCity;
}
@Override
public String getName()
{
return name;
}
@Override
public void setName(String name)
{
this.name = name;
}
@Override
public ICountry getCountryId()
{
return countryId;
}
@Override
public void setCountryId(ICountry countryId)
{
this.countryId = (Country) countryId;
}
@Override
public int hashCode()
{
int hash = 0;
hash += (idCity != null ? idCity.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object)
{
// TODO: Warning - this method won't work in the case the id fields are
// not set
if (!(object instanceof City))
{
return false;
}
City other = (City) object;
if ((this.idCity == null && other.idCity != null) || (this.idCity != null && !this.idCity.equals(other.idCity)))
{
return false;
}
return true;
}
@Override
public String toString()
{
return "com.neology.ebreeder.model.entities.City[ idCity=" + idCity + " ]";
}
}
正如您在實體中看到的,我有使用共享接口的 getter 和 setter,我認為這可能會引發問題,我想使用實體覆蓋 getter,但我無法覆蓋 setter。
我不能這樣做:
@Override
public Country getCountryId()
{
return countryId;
}
但我不能這樣做:
@Override
public void setCountryId(Country countryId)
{
this.countryId = (Country) countryId;
}
你有沒有看到更好的解決方案,或者你能給我你的觀點:)
謝謝
根據過去的經驗,我認為使用 DTO 模型和 JPA 模型之間共享的接口不是一個好主意。
本質上,您使用這種方法將 DTO 模型與 JPA 模型緊密耦合。
我寧願讓它們松散耦合並使用單獨的框架在這兩個模型之間進行復制。 這將需要由元模型(可以從 JPA 派生)提供支持,以基於 getter 和 setter 將數據從一個模型復制到另一個模型。
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