Mapper array to List example

Hi,

Would be nice to have an example that shows the usage of MapStruct with array (like int[] ) to immutable list with specific add and addAll (like in protobuf).

example:
proto file

    message UserDTO {
        string id = 1;
        string email = 2;
        repeated PermissionDTO permissions = 3;
        repeated DepartmentDTO main_departments  = 4;
        repeated DepartmentDTO departments  = 5;
    }

java file

 public class User {

     private String id;
     private String email;
     private Permission[] permissions = new Permission[0];
     private List<Department> mainDepartments = new ArrayList<>();
     private List<Department> departments = new ArrayList<>();

     public String getId() {
         return id;
     }

     public void setId(String id) {
         this.id = id;
     }

     public String getEmail() {
         return email;
     }

     public void setEmail(String email) {
         this.email = email;
     }

     public Permission[] getPermissions() {
         return permissions;
     }

     public void setPermissions(Permission[] permissions) {
         this.permissions = permissions;
     }

public List<Department> getDepartments() {
	return departments;
}

public void setDepartments(List<Department> departments) {
	this.departments = departments;
}

public List<Department> getMainDepartments() {
	return mainDepartments;
}

public void setMainDepartments(List<Department> mainDepartments) {
	this.mainDepartments = mainDepartments;
}
 }

Mapper

 @Mapper(collectionMappingStrategy = CollectionMappingStrategy.ADDER_PREFERRED,
         nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS)
 public interface UserMapper {

     UserMapper INSTANCE = Mappers.getMapper(UserMapper.class);


     @Mapping(source = "permissions", target = "permissionsList")
     @Mapping(source = "mainDepartments", target = "mainDepartmentsList")
     @Mapping(source = "departments", target = "departmentsList")
     UserDTO map(User user);
 }

Error:
Can't map property "Permission[] permissions" to "PermissionDTO permissionsList".

### Desired solution:

 public class UserMapperImpl implements UserMapper {

     @Override
     public UserDTO map(User user) {
         if ( user == null ) {
             return null;
         }

         Builder userDTO = UserDTO.newBuilder();

         if ( user.getPermissions() != null ) {
             for ( Permission permission : user.getPermissions() ) {
                 userDTO.addPermissions( map( permission ) );
             }
         }
    
        ...

         return userDTO.build();
     }
 }

or

 public class UserMapperImpl implements UserMapper {

     @Override
     public UserDTO map(User user) {
         if ( user == null ) {
             return null;
         }

         Builder userDTO = UserDTO.newBuilder();

         if ( user.getPermissions() != null ) {
             userDTO.addAllPermissions( map( user.getPermissions()) );
         }
    
        ...

         return userDTO.build();
     }
 }

Is it possible to do this with actual release?

Bắt đầu từ ví dụ UserMapper và UserMapperImpl được tạo như trong issue, sau đó kiểm tra cách protobuf UserDTO builder cung cấp addPermissions và addAllPermissions. Ví dụ được hoàn tất khi minh họa việc ánh xạ nguồn Permission[] vào trường permissions repeated của protobuf và bao gồm hành vi chuyển từ mảng sang danh sách tương ứng được yêu cầu.