龙目岛等于和哈希代码与继承

Question

我想使用lombok：EqualsAndHashCode，只考虑Id，设置在Item class上，在分层结构之上。这些是我的课程： 1.流程：

@Data
@Entity
@EqualsAndHashCode(callSuper = true, onlyExplicitlyIncluded = true)
@ToString(callSuper = true)
public class Process extends ResourceWithFlows {

  @OneToOne
  private Cost cost;
  private UUID referenceProduct; //flowBaseId
  private UUID processBaseId;
  private UUID processTemplateId;
  private boolean paretoApplied;

  //ref
  @ManyToOne
  @JoinColumn(name = "fk_equipment")
  private Equipment equipment;

  @ManyToOne
  @JoinColumn(name = "fk_production_line")
  private ProductionLine productionLine;

  @ManyToOne
  @JoinColumn(name = "fk_company")
  private Company company;

  @ManyToOne
  @JoinColumn(name = "fk_supply_chain")
  private SupplyChain supplyChain;

}

2.资源流动：

@Data
@Entity
@EqualsAndHashCode(callSuper = true, onlyExplicitlyIncluded = true)
@ToString(callSuper = true)
public class ResourceWithFlows extends Resource {
    @OneToMany
    @JoinColumn(name = "fk_flow")
    private Set<Flow> flows;
    @OneToMany
    @JoinColumn(name = "fk_elementary_flow")
    private Set<ElementaryFlow> elementaryFlows;
    
}

3.项目：

@Data
@Entity
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public class Item {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @EqualsAndHashCode.Include
    private UUID id;
    private String name;
    private LocalDateTime creationDate;
    @Lob
    private String description;
    @OneToOne
    private AuthUser creatorUser;

    @PrePersist
    void creationDate () {
        this.creationDate = LocalDateTime.now();;
    }

}

这是正确的还是有其他方法可以通过Id来比较像Process这样的项的子项？我在孩子中使用了callSuper=true和onlyExplicitlyIncluded=true，设置了@EqualsAndHashCode。包含父项的id属性，但我不确定它是否正确。

Answer 1

您所做的确实有效，但鉴于您的要求，似乎完全没有必要。如果您只打算使用最顶层类中的id字段来识别对象，则无需在层次结构中的任何位置应用@EqualsAndHashCode。项目中生成的方法将适用于所有子类。