[英]Is there a way to auto generate a flatten pojo from a pojo with object composition
我需要将文档存储到 Elasticsearch 索引中,因此我定义了一个映射。 从我的 Java 客户端,我需要为它提供看起来像 Compony 类的 pojo。 它有很多重复的值。 我可以使用对象组合模式来解决这个问题,但 Elasticsearch 无法处理这种结构,因此它需要一个扁平结构。
class Company {
private String postalstreetName;
private String postalHouseNumer;
private String postalHouseLetter;
private String postalHouseNumberAddition;
private String postalZipCode;
private String postalCity;
private String postalCountry;
private String visitorstreetName;
private String visitorHouseNumer;
private String visitorHouseLetter;
private String visitorHouseNumberAddition;
private String visitorZipCode;
private String visitorCity;
private String visitorCountry;
private String establishmentstreetName;
private String establishmentHouseNumer;
private String establishmentHouseLetter;
private String establishmentHouseNumberAddition;
private String establishmentZipCode;
private String establishmentCity;
private String establishmentCountry;
}
我实际上想要像下面这样的 pojo,并以某种方式自动生成上面具有相同命名结构的 pojo。
class Address {
private String streetName;
private String houseNumer;
private String houseLetter;
private String houseNumberAddition;
private String zipCode;
private String city;
private String country;
}
class Company {
private Address postalAddress;
private Address visitorAddress;
private Address establishmentAddress;
}
有人知道这样的事情是否可能,从具有对象组合的 pojo 自动生成扁平 pojo,所有字段的名称前缀?
我得到了解决我的问题的方法。 Elasticsearch 需要一个 json 对象,其结构与我在第一个示例中的结构相同。 所以我所做的是将@JsonUnwrapped
添加到带有前缀值的字段中,因此我的 Company 类如下所示:
class Company {
@JsonUnwrapped(prefix = "postal")
private Address postalAddress;
@JsonUnwrapped(prefix = "visitor")
private Address visitorAddress;
@JsonUnwrapped(prefix = "Establishment")
private Address establishmentAddress;
}
结果将是:
{
"postalStreetName":"",
"postalHouseNumer":"",
"postalHouseLetter":"",
"postalHouseNumberAddition":"",
"postalCity":"",
"postalCountry":"",
"visitorStreetName":"",
"visitorHouseNumer":"",
"visitorHouseLetter":"",
"visitorHouseNumberAddition":"",
"visitorCity":"",
"visitorCountry":"",
"establishmentStreetName":"",
"establishmentHouseNumer":"",
"establishmentHouseLetter":"",
"establishmentHouseNumberAddition":"",
"establishmentCity":"",
"establishmentCountry":""
}
所以我不需要以某种方式神奇地创建那些 pojo,因为 jackson 可以创建我需要的 json 文件。
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