Use the nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS on the mapping property you want to be checked. In the following snippet you can see a PostalAdress entity is mapped to an entity of the same type, but the id is overwritten only when it is present in the source:
import java.time.LocalDateTime;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.NullValueCheckStrategy;
import com.example.entity.PostalAddress;
@Mapper(
componentModel = "cdi",
imports = {LocalDateTime.class})
public interface PostalAddressEntity2EntityMapperService {
@Mapping(source = "id", target = "id", nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS)
PostalAddress toPostalAddressntityToPostalAddressEntity(
PostalAddress PostalAddress);
}
This will generate something similar with the following
package com.example.entitytoentity;
import com.example.entity.PostalAddress;
import java.time.LocalDateTime;
import javax.annotation.processing.Generated;
import javax.enterprise.context.ApplicationScoped;
@Generated(
value = "org.mapstruct.ap.MappingProcessor",
date = "2021-09-01T14:28:11+0200",
comments = "version: 1.4.2.Final, compiler: javac, environment: Java 11.0.12 (Azul Systems, Inc.)"
)
@ApplicationScoped
public class PostalAddressEntity2EntityMapperServiceImpl implements PostalAddressEntity2EntityMapperService {
@Override
public PostalAddress toPostalAddressEntity(PostalAddress PostalAddress) {
if ( PostalAddress == null ) {
return null;
}
PostalAddress PostalAddress1 = new PostalAddress();
if ( PostalAddress.getId() != null ) {
PostalAddress1.setId( PostalAddress.getId() );
}
PostalAddress1.setStreeNo( PostalAddress.getStreetNo() );
PostalAddress1.setStreet( PostalAddress.getStreet() );
PostalAddress1.setMainAdress( PostalAddress.getMainAdress() );
return PostalAddress1;
}
}
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