Deltaspike data criteria support - Is it possible to query enum Sets?

[Thomas Lustig <tm...@gmail.com>]

dear community,

I really enjoy using the criteria api from the Deltaspike Data module.
At the moment i do have the problem, that I need to query an enumset.

The Class structure looks like this:

class BuildPart {
    String name;
    Set< Permission > permissions
}

class Permission {
     Long userid;
     Set<PermissionType> permissionTypes;
}

enum PermissionType {
    CREATE, READ, EDIT, DELETE
}

i want to query for  BuildParts where userid = 2 has permissions to read, I
tried:

------------ snippet  start -----------
criteria()
.join(BuildPart_.permissions,
where (Permission.class)
.eq(Permission_.userid, 2L)
)
.join(Permission_.permissionTypes,
where(PermissionType.class)
.eq(PermissionType.READ) <--- NOT possible
)
------------ snippet  end-----------

the "eq" function and also the "in" function always require a
"SingularAttribute" parameter.

when using Criteria of JPA, i got this simply working by:

------------ snippet  start -----------
SetJoin<BuildPart, Permission> permissionJoin =
root.join(BuildPart_.permissions);
Predicate readPermissions = criteriaBuilder.and(
criteriaBuilder.equal(
permissionJoin.get(Permission_.userid),
2L,
criteriaBuilder.isMember(
PermissionType.READ,
permissionJoin.get(Permission_.permissionTypes)));
------------ snippet  end-----------

Is there a way, how i could achieve such a query? (maybe with a workaround)

Thanking you very much for any idea

Tom