如何使用推土机将类型字段映射为抽象类？

发布于 2024-12-20 15:55:00 字数 1088 浏览 1 评论 0原文

我有以下域结构：

abstract class Person { String name; //with getter and setter }
class Employer extends Person {}
class Employee extends Person {}
class Contract { Person contractor; //with getter and setter }
class PersonDTO implements Serializable { String name; String type; //type == 'Employee' or 'Employer' }
class ContractDTO implements Serializable { PersonDTO contractor; }

现在，当我设置以下推土机映射时：

<mapping>
   <class-a>Person</class-a>
   <class-b>PersonDTO</class-b>
</mapping>
<mapping>
   <class-a>Employer</class-a>
   <class-b>PersonDTO</class-b>
</mapping>
<mapping>
   <class-a>Contract</class-a>
   <class-b>ContractDTO</class-b>
</mapping>

我的问题涉及字段 Contract.contractor 从 B 到 A 的映射，因为字段 Contract.contractor 是一个抽象类，推土机无法猜测如何实例化它。

所以我的问题很简单：我如何向推土机指示，对于字段 Contract.contractor 的映射，如果 type == 'Employer ，它应该实例化 Employer 的实例>' 以及其他Employee ？

感谢您的帮助。

原文

I have the following domain structure:

abstract class Person { String name; //with getter and setter }
class Employer extends Person {}
class Employee extends Person {}
class Contract { Person contractor; //with getter and setter }
class PersonDTO implements Serializable { String name; String type; //type == 'Employee' or 'Employer' }
class ContractDTO implements Serializable { PersonDTO contractor; }

Now when I set up this following dozer mapping:

<mapping>
   <class-a>Person</class-a>
   <class-b>PersonDTO</class-b>
</mapping>
<mapping>
   <class-a>Employer</class-a>
   <class-b>PersonDTO</class-b>
</mapping>
<mapping>
   <class-a>Contract</class-a>
   <class-b>ContractDTO</class-b>
</mapping>

My problem concerns the mapping of the field Contract.contractor from B to A because the field Contract.contractor is an abstract class and dozer cannot guess how to instanciate it.

So my question is simple: how can I indicate to dozer that, for the mapping of the field Contract.contractor, it should instantiate an instance of Employer if type == 'Employer' and elsewhere Employee ?

Thank you for your help.

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风启觞 2024-12-27 15:55:00

您可以通过提示来完成此操作。
有点像这样：

<mapping>
 <class-a>Contract</class-a>
 <class-b>ContractDTO</class-b>
 <field>
   <a>contractor</a>
   <b>contractor</b>
   <a-hint>your.package.Employer, your.package.Employee</a-hint>
   <b-hint>your.DTOpackage.EmployerDTO, your.DTOpackage.EmployeeDTO</b-hint>
 </field>
</mapping>

You can do this with hints.
Somewhat like this:

<mapping>
 <class-a>Contract</class-a>
 <class-b>ContractDTO</class-b>
 <field>
   <a>contractor</a>
   <b>contractor</b>
   <a-hint>your.package.Employer, your.package.Employee</a-hint>
   <b-hint>your.DTOpackage.EmployerDTO, your.DTOpackage.EmployeeDTO</b-hint>
 </field>
</mapping>

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