Entity Arguments

InterfaceProduct.java

interface ProductDesc {
  String getTitle();
  long getPrice();
  String getContent();
  boolean isDiscountable();
}

@Entity
@Getter
@EqualsAndHashCode
@ToString
@NoArgsConstructor(access = PACKAGE)
class Product implements ProductDesc {
  @Id
  @GeneratedValue
  private Long id;
  private String title;
  private long price;
  private String content;
  private boolean discountable;

  public void update(ProductDesc param) {
    if (param.getPrice() < 0) {
      throw new IllegalArgumentException("price must greater than 0");
    }
    this.title = param.getTitle();
    this.price = param.getPrice();
    this.content = param.getContent();
    this.discountable = param.isDiscountable();
  }
}

ValueProduct.java

@Value
class ProductUpdate {
  private String title;
  private long price;
  private String content;
  private boolean discountable;
  
  public ProductDesc(String title, long price, String content, boolean discountable) {
    if (param.getPrice() < 0) {
      throw new IllegalArgumentException("price must greater than 0");
    }
    this.title = title;
    this.price = price;
    this.content = content;
    this.discountable = discountable;
  }
}

@Entity
@Getter
@EqualsAndHashCode
@ToString
@NoArgsConstructor(access = PACKAGE)
class Product {
  @Id
  @GeneratedValue
  private Long id;
  private String title;
  private long price;
  private String content;
  private boolean discountable;

  public void update(ProductUpdate param) {
    this.title = param.getTitle();
    this.price = param.getPrice();
    this.content = param.getContent();
    this.discountable = param.isDiscountable();
  }
}