public static Predicate[] deviceListPredicates(
      CriteriaBuilder cb,
      Root<Device> from,
      List<String> guids,
      Optional<HivePrincipal> principal) {
    final List<Predicate> predicates = deviceSpecificPrincipalPredicates(cb, from, principal);
    if (guids != null && !guids.isEmpty()) {
      predicates.add(from.get(GUID).in(guids));
    }

    return predicates.toArray(new Predicate[predicates.size()]);
  }
 public static Predicate[] networkPermissionsPredicates(
     CriteriaBuilder cb, Root<?> from, Set<AccessKeyPermission> permissions) {
   List<Predicate> predicates = new ArrayList<>();
   for (AccessKeyBasedFilterForDevices extraFilter :
       AccessKeyBasedFilterForDevices.createExtraFilters(permissions)) {
     List<Predicate> filter = new ArrayList<>();
     if (extraFilter.getNetworkIds() != null) {
       filter.add(from.get("id").in(extraFilter.getNetworkIds()));
     }
     predicates.add(cb.and(filter.toArray(new Predicate[filter.size()])));
   }
   return predicates.toArray(new Predicate[predicates.size()]);
 }
  @SuppressWarnings("unchecked")
  private static List<Predicate> deviceSpecificPrincipalPredicates(
      CriteriaBuilder cb, Root<Device> from, Optional<HivePrincipal> principal) {
    final List<Predicate> predicates = new LinkedList<>();
    final Join<Device, Network> networkJoin = (Join) from.fetch("network", JoinType.LEFT);
    final Join<Device, Network> usersJoin = (Join) networkJoin.fetch("users", JoinType.LEFT);
    from.fetch("deviceClass", JoinType.LEFT); // need this fetch to populate deviceClass
    principal.ifPresent(
        p -> {
          User user = p.getUser();
          if (user == null && p.getKey() != null) {
            user = p.getKey().getUser();
          }
          if (user != null && !user.isAdmin()) {
            predicates.add(cb.equal(usersJoin.<Long>get("id"), user.getId()));
          }

          if (p.getDevice() != null) {
            predicates.add(cb.equal(from.<Long>get("id"), p.getDevice().getId()));
          }

          if (p.getKey() != null) {
            for (AccessKeyBasedFilterForDevices extraFilter :
                AccessKeyBasedFilterForDevices.createExtraFilters(p.getKey().getPermissions())) {
              if (extraFilter.getDeviceGuids() != null) {
                predicates.add(from.<String>get("guid").in(extraFilter.getDeviceGuids()));
              }
              if (extraFilter.getNetworkIds() != null) {
                predicates.add(networkJoin.<Long>get("id").in(extraFilter.getNetworkIds()));
              }
            }
          }
        });

    return predicates;
  }
  public static Predicate[] oAuthClientListPredicates(
      CriteriaBuilder cb,
      Root<OAuthClient> from,
      Optional<String> nameOpt,
      Optional<String> namePattern,
      Optional<String> domainOpt,
      Optional<String> oauthIdOpt) {
    List<Predicate> predicates = new LinkedList<>();

    if (namePattern.isPresent()) {
      namePattern.ifPresent(pattern -> predicates.add(cb.like(from.get("name"), pattern)));
    } else {
      nameOpt.ifPresent(name -> predicates.add(cb.equal(from.get("name"), name)));
    }
    domainOpt.ifPresent(domain -> predicates.add(cb.equal(from.get("domain"), domain)));
    oauthIdOpt.ifPresent(id -> predicates.add(cb.equal(from.get("oauthId"), id)));

    return predicates.toArray(new Predicate[predicates.size()]);
  }
  public static Predicate[] deviceClassListPredicates(
      CriteriaBuilder cb,
      Root<DeviceClass> from,
      Optional<String> name,
      Optional<String> namePattern,
      Optional<String> version) {
    final List<Predicate> predicates = new LinkedList<>();
    if (namePattern.isPresent()) {
      namePattern.ifPresent(np -> predicates.add(cb.like(from.get("name"), np)));
    } else {
      name.ifPresent(n -> predicates.add(cb.equal(from.get("name"), n)));
    }

    version.ifPresent(v -> predicates.add(cb.equal(from.get(DeviceClass.VERSION_COLUMN), v)));
    return predicates.toArray(new Predicate[predicates.size()]);
  }
  public static Predicate[] userListPredicates(
      CriteriaBuilder cb,
      Root<User> from,
      Optional<String> loginOpt,
      Optional<String> loginPattern,
      Optional<Integer> roleOpt,
      Optional<Integer> statusOpt) {
    List<Predicate> predicates = new LinkedList<>();

    if (loginPattern.isPresent()) {
      loginPattern.ifPresent(pattern -> predicates.add(cb.like(from.get("login"), pattern)));
    } else {
      loginOpt.ifPresent(login -> predicates.add(cb.equal(from.get("login"), login)));
    }

    roleOpt.ifPresent(role -> predicates.add(cb.equal(from.get("role"), role)));
    statusOpt.ifPresent(status -> predicates.add(cb.equal(from.get("status"), status)));

    return predicates.toArray(new Predicate[predicates.size()]);
  }
  public static Predicate[] accessKeyListPredicates(
      CriteriaBuilder cb,
      Root<AccessKey> from,
      Long userId,
      Optional<String> labelOpt,
      Optional<String> labelPatten,
      Optional<Integer> typeOpt) {
    List<Predicate> predicates = new LinkedList<>();

    Join user = (Join) from.fetch("user", JoinType.LEFT);
    predicates.add(cb.equal(user.get("id"), userId));

    if (labelPatten.isPresent()) {
      labelPatten.ifPresent(pattern -> predicates.add(cb.like(from.get("label"), pattern)));
    } else {
      labelOpt.ifPresent(label -> predicates.add(cb.equal(from.get("label"), label)));
    }

    typeOpt.ifPresent(type -> predicates.add(cb.equal(from.get("type"), type)));

    return predicates.toArray(new Predicate[predicates.size()]);
  }
  /**
   * Creates an array of JPA predicates for networks list query. Add filter predicates for name and
   * principal if required. 1) if name is specified adds 'name = ?' predicate 2) if name pattern is
   * specified adds 'name like ?' predicate 3) if principal is user of key without ADMIN role adds
   * predicate for filtering not assigned networks 4) if principal is key which has permissions only
   * to specific networks adds 'network.id in (allowed_networks)' predicates
   *
   * @return array of above predicates
   * @see {@link com.devicehive.service.NetworkService#list(String, String, String, boolean,
   *     Integer, Integer, HivePrincipal)}
   */
  public static Predicate[] networkListPredicates(
      CriteriaBuilder cb,
      Root<Network> from,
      Optional<String> nameOpt,
      Optional<String> namePatternOpt,
      Optional<HivePrincipal> principalOpt) {
    List<Predicate> predicates = new LinkedList<>();

    nameOpt.ifPresent(name -> predicates.add(cb.equal(from.get("name"), name)));

    namePatternOpt.ifPresent(pattern -> predicates.add(cb.like(from.get("name"), pattern)));

    principalOpt
        .flatMap(
            principal -> {
              User user = principal.getUser();
              if (user == null && principal.getKey() != null) {
                user = principal.getKey().getUser();
              }
              return ofNullable(user);
            })
        .ifPresent(
            user -> {
              if (!user.isAdmin()) {
                predicates.add(from.join("users").in(user));
              }
            });

    principalOpt
        .map(HivePrincipal::getKey)
        .ifPresent(
            key ->
                predicates.add(
                    cb.or(networkPermissionsPredicates(cb, from, key.getPermissions()))));

    return predicates.toArray(new Predicate[predicates.size()]);
  }
  @SuppressWarnings("unchecked")
  public static Predicate[] deviceListPredicates(
      CriteriaBuilder cb,
      Root<Device> from,
      Optional<String> name,
      Optional<String> namePattern,
      Optional<String> status,
      Optional<Long> networkId,
      Optional<String> networkName,
      Optional<Long> deviceClassId,
      Optional<String> deviceClassName,
      Optional<String> deviceClassVersion,
      Optional<HivePrincipal> principal) {
    final List<Predicate> predicates = new LinkedList<>();

    name.ifPresent(n -> predicates.add(cb.equal(from.<String>get("name"), n)));
    namePattern.ifPresent(np -> predicates.add(cb.like(from.<String>get("name"), np)));
    status.ifPresent(s -> predicates.add(cb.equal(from.<String>get("status"), s)));

    final Join<Device, Network> networkJoin = (Join) from.fetch("network", JoinType.LEFT);
    networkId.ifPresent(nId -> predicates.add(cb.equal(networkJoin.<Long>get("id"), nId)));
    networkName.ifPresent(
        nName -> predicates.add(cb.equal(networkJoin.<String>get("name"), nName)));

    final Join<Device, DeviceClass> dcJoin = (Join) from.fetch("deviceClass", JoinType.LEFT);
    deviceClassId.ifPresent(dcId -> predicates.add(cb.equal(dcJoin.<Long>get("id"), dcId)));
    deviceClassName.ifPresent(
        dcName -> predicates.add(cb.equal(dcJoin.<String>get("name"), dcName)));
    deviceClassVersion.ifPresent(
        dcVersion -> predicates.add(cb.equal(dcJoin.<String>get("version"), dcVersion)));

    predicates.addAll(deviceSpecificPrincipalPredicates(cb, from, principal));

    return predicates.toArray(new Predicate[predicates.size()]);
  }
  public static Predicate[] oAuthGrantsListPredicates(
      CriteriaBuilder cb,
      Root<OAuthGrant> from,
      User user,
      Optional<Date> startOpt,
      Optional<Date> endOpt,
      Optional<String> oAuthIdOpt,
      Optional<Integer> typeOpt,
      Optional<String> scopeOpt,
      Optional<String> redirectUri,
      Optional<Integer> accessType) {
    List<Predicate> predicates = new LinkedList<>();

    if (!user.isAdmin()) {
      predicates.add(from.join("user").in(user));
    }

    startOpt.ifPresent(start -> predicates.add(cb.greaterThan(from.get("timestamp"), start)));
    endOpt.ifPresent(end -> predicates.add(cb.lessThan(from.get("timestamp"), end)));
    oAuthIdOpt.ifPresent(id -> predicates.add(cb.equal(from.join("client").get("oauthId"), id)));
    typeOpt.ifPresent(type -> predicates.add(cb.equal(from.get("type"), type)));
    scopeOpt.ifPresent(scope -> predicates.add(cb.equal(from.get("scope"), scope)));
    redirectUri.ifPresent(uri -> predicates.add(cb.equal(from.get("redirectUri"), uri)));
    accessType.ifPresent(at -> predicates.add(cb.equal(from.get("accessType"), at)));

    return predicates.toArray(new Predicate[predicates.size()]);
  }