MapStruct @Mapping whithout source parameter

Question

I need to convert a dto to entity and the entity has a field to populate which doesn't needs any field of the dto. Indeed, the @Mapping annotation doesn't take any source.

Let's illustrate it with this simple example :

public class Employee {
    private String firstName;
    private String customId;
}

public class EmployeeDto {
    private String firstName;
}

As you can the field customId of the Employee entity doesn't exist in the EmployeeDTO.

Also, I have the following formatter. Obviously, I created an @CustomIdGenerator @interface

public class EmployeeFormatter {
    @CustomIdGenerator
    public static String simulationIdGenerator() {
       return // businessLogic
    }
}

And finally my mapper looks like this :

@Mapper(uses = EmployeeFormatter.class)
public abstract class EmployeeMapper {

    @Mapping(target = "customId", qualifiedBy = customIdGenerator.class)
    public abstract Employee toEmployee(EmployeeDTO dto);

}

But in the generated classes it doesn't work. Do you know if there is any way to use a mapper whithout parameter ?

Thanks for your help ;)

EDIT :

Based on the response of @Nikolai Shevchenko the following code works :

  @AfterMapping
    void setCustomId(@MappingTarget Employee employee) {
        employee.setCustomId(EmployeeFormatter.customIdGenerator());
    }

Anshul Sharma · Accepted Answer · 2020-06-22 12:46:14Z

7

You can try using expression field in the mapping like this(another way of doing this without source param)

@Mapper(uses = EmployeeFormatter.class)
public abstract class EmployeeMapper {

    @Mapping(target = "customId", expression = "java(getCustomId())")
    public abstract Employee toEmployee(EmployeeDTO dto);

    public String getCustomId() {
        return EmployeeFormatter.customIdGenerator();
    }

}

edited Jun 22, 2020 at 12:46

answered Jun 22, 2020 at 12:37

Anshul Sharma

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Comments

Nikolai Shevchenko · Accepted Answer · 2020-06-22 09:26:43Z

2

@Mapper
public abstract class EmployeeMapper {

    @Mapping
    public abstract Employee toEmployee(EmployeeDTO dto);

    @AfterMapping
    void mapCustomId(Employee source, @MappingTarget EmployeeDTO dto) {
        dto.setCustomId(EmployeeFormatter.simulationIdGenerator())
    }
}

answered Jun 22, 2020 at 9:26

Nikolai Shevchenko

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1 Comment

Pierre Jones Over a year ago

Great ! Thanks for the response but based on your response it can be done in a simple way. Check my post edit ;)

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