@SuppressWarnings("unchecked")
protected SetJoin<UserEntity, ExtensionFieldValueEntity> createOrGetJoin(
String alias,
Root<UserEntity> root,
SetAttribute<UserEntity, ExtensionFieldValueEntity> attribute) {
for (Join<UserEntity, ?> currentJoin : root.getJoins()) {
if (currentJoin.getAlias() == null) {
// if alias is null, it is not an alias for an extension join, so we ignore it
continue;
}
if (currentJoin.getAlias().equals(alias)) {
return (SetJoin<UserEntity, ExtensionFieldValueEntity>) currentJoin;
}
}
final SetJoin<UserEntity, ExtensionFieldValueEntity> join = root.join(attribute, JoinType.LEFT);
join.alias(alias);
return join;
}
