Mapper array to List example

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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 mainDepartments = new ArrayList<>();
private List 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 getDepartments() {
return departments;
}

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

public List getMainDepartments() {
return mainDepartments;
}

public void setMainDepartments(List 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?**

Parti dall’esempio UserMapper e dal UserMapperImpl generato mostrato nell’issue, quindi esamina come il builder protobuf UserDTO espone addPermissions e addAllPermissions. L’esempio è completo quando dimostra il mapping della sorgente Permission[] al campo protobuf permissions di tipo repeated e include il comportamento corrispondente da array a lista richiesto.

Scritto dal modello di indicizzazione a partire dal testo della issue.