class.ilObject.php

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<?php

declare(strict_types=1);

use ILIAS\ILIASObject\LocalDIC;
use ILIAS\MetaData\Services\ServicesInterface as LOMServices;
use ILIAS\ILIASObject\Properties\Properties;
use ILIAS\ILIASObject\Properties\Translations\Translations;
use ILIAS\ILIASObject\Properties\Translations\CachedRepository as TranslationsRepository;
use ILIAS\ILIASObject\Properties\Aggregator;

class ilObject
{
    public const TITLE_LENGTH = 255; // title column max length in db
    public const DESC_LENGTH = 128; // (short) description column max length in db
    public const LONG_DESC_LENGTH = 4000; // long description column max length in db
    public const TABLE_OBJECT_DATA = "object_data";

    private ?Properties $object_properties = null;

    protected ilLogger $obj_log;
    protected ?ILIAS $ilias;
    protected ?ilObjectDefinition $obj_definition;
    protected ilDBInterface $db;
    protected ?ilLogger $log;
    protected ?ilErrorHandling $error;
    protected ilTree $tree;
    protected ?ilAppEventHandler $app_event_handler;
    protected ilRbacAdmin $rbac_admin;
    protected ilRbacReview $rbac_review;
    protected ilObjUser $user;
    protected ilLanguage $lng;
    protected LOMServices $lom_services;
    private Aggregator $properties_aggregator;
    private TranslationsRepository $translations_repository;

    protected bool $call_by_reference;
    protected int $max_title = self::TITLE_LENGTH;
    protected int $max_desc = self::DESC_LENGTH;
    protected bool $add_dots = true;
    protected ?int $ref_id = null;
    protected string $type = "";
    protected string $title = "";
    protected string $desc = "";
    protected string $long_desc = "";
    protected int $owner = 0;
    protected string $create_date = "";
    protected string $last_update = "";
    protected string $import_id = "";
    protected bool $register = false;   // registering required for object? set to true to implement a subscription interface

    private bool $process_auto_reating = false;


    public array $objectList;


    // BEGIN WebDAV: WebDAV needs to access the untranslated title of an object
    public string $untranslatedTitle;
    // END WebDAV: WebDAV needs to access the untranslated title of an object

    public function __construct(
        protected int $id = 0,
        protected bool $referenced = true
    ) {
        global $DIC;

        $this->ilias = $DIC["ilias"];
        $this->obj_definition = $DIC["objDefinition"];
        $this->db = $DIC["ilDB"];
        $this->log = $DIC["ilLog"];
        $this->obj_log = ilLoggerFactory::getLogger("obj");
        $this->error = $DIC["ilErr"];
        $this->tree = $DIC["tree"];
        $this->app_event_handler = $DIC["ilAppEventHandler"];
        $this->lom_services = $DIC->learningObjectMetadata();
        $object_dic = LocalDIC::dic();
        $this->properties_aggregator = $object_dic['properties.aggregator'];
        $this->translations_repository = $object_dic['properties.translations.repository'];

        $this->call_by_reference = $this->referenced;

        if (isset($DIC["lng"])) {
            $this->lng = $DIC["lng"];
        }

        if (isset($DIC["ilUser"])) {
            $this->user = $DIC["ilUser"];
        }

        if (isset($DIC["rbacadmin"])) {
            $this->rbac_admin = $DIC["rbacadmin"];
        }

        if (isset($DIC["rbacreview"])) {
            $this->rbac_review = $DIC["rbacreview"];
        }

        if ($id == 0) {
            $this->referenced = false;          // newly created objects are never referenced
        }                                                                       // they will get referenced if createReference() is called

        if ($this->referenced) {
            $this->ref_id = $id;
        } else {
            $this->id = $id;
        }
        // read object data
        if ($id != 0) {
            $this->read();
        }
    }

    public function getObjectProperties(): Properties
    {
        if ($this->object_properties === null) {
            $this->object_properties = $this->properties_aggregator->getFor($this->id, $this->type);
        }
        return $this->object_properties;
    }

    public function flushObjectProperties(): void
    {
        $this->object_properties = null;
    }

    final public function withReferences(): bool
    {
        // both vars could differ. this method should always return true if one of them is true without changing their status
        return ($this->call_by_reference) ? true : $this->referenced;
    }

    public function processAutoRating(): void
    {
        $this->process_auto_reating = true;
    }

    public function read(): void
    {
        global $DIC;
        try {
            $ilUser = $DIC["ilUser"];
        } catch (InvalidArgumentException $e) {
        }

        if ($this->referenced) {
            if (!isset($this->ref_id)) {
                $message = "ilObject::read(): No ref_id given! (" . $this->type . ")";
                $this->error->raiseError($message, $this->error->WARNING);
            }

            // read object data
            $sql =
                "SELECT od.obj_id, od.type, od.title, od.description, od.owner, od.create_date," . PHP_EOL
                . "od.last_update, od.import_id, ore.ref_id, ore.obj_id, ore.deleted, ore.deleted_by" . PHP_EOL
                . "FROM " . self::TABLE_OBJECT_DATA . " od" . PHP_EOL
                . "JOIN object_reference ore ON od.obj_id = ore.obj_id" . PHP_EOL
                . "WHERE ore.ref_id = " . $this->db->quote($this->ref_id, "integer") . PHP_EOL
            ;

            $result = $this->db->query($sql);

            // check number of records
            if ($this->db->numRows($result) === 0) {
                $message = sprintf(
                    "ilObject::read(): Object with ref_id %s not found! (%s)",
                    $this->ref_id,
                    $this->type
                );
                $this->error->raiseError($message, $this->error->WARNING);
            }
        } else {
            if (!isset($this->id)) {
                $message = sprintf("ilObject::read(): No obj_id given! (%s)", $this->type);
                $this->error->raiseError($message, $this->error->WARNING);
            }

            $sql =
                "SELECT obj_id, type, title, description, owner, create_date, last_update, import_id, offline" . PHP_EOL
                . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
                . "WHERE obj_id = " . $this->db->quote($this->id, "integer") . PHP_EOL
            ;
            $result = $this->db->query($sql);

            if ($this->db->numRows($result) === 0) {
                $message = sprintf("ilObject::read(): Object with obj_id: %s (%s) not found!", $this->id, $this->type);
                throw new ilObjectNotFoundException($message);
            }
        }
        $obj = $this->db->fetchAssoc($result);

        $this->id = (int) $obj["obj_id"];

        // check type match (the "xxx" type is used for the unit test)
        if ($this->type != $obj["type"] && $obj["type"] != "xxx") {
            $message = sprintf(
                "ilObject::read(): Type mismatch. Object with obj_id: %s was instantiated by type '%s'. DB type is: %s",
                $this->id,
                $this->type,
                $obj["type"]
            );

            $this->log->write($message);
            throw new ilObjectTypeMismatchException($message);
        }

        $this->type = (string) $obj["type"];
        $this->title = (string) $obj["title"];
        // BEGIN WebDAV: WebDAV needs to access the untranslated title of an object
        $this->untranslatedTitle = (string) $obj["title"];
        // END WebDAV: WebDAV needs to access the untranslated title of an object

        $this->desc = (string) $obj["description"];
        $this->owner = (int) $obj["owner"];
        $this->create_date = (string) $obj["create_date"];
        $this->last_update = (string) $obj["last_update"];
        $this->import_id = (string) $obj["import_id"];

        if ($this->obj_definition->isRBACObject($this->getType())) {
            $sql =
                "SELECT obj_id, description" . PHP_EOL
                . "FROM object_description" . PHP_EOL
                . "WHERE obj_id = " . $this->db->quote($this->id, 'integer') . PHP_EOL
            ;

            $res = $this->db->query($sql);

            $this->long_desc = '';
            while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
                if (($row->description ?? '') !== '') {
                    $this->setDescription($row->description);
                }
            }
        }

        // multilingual support system objects (sys) & categories (db)
        $translation_type = $this->obj_definition->getTranslationType($this->type);

        if ($translation_type == "sys") {
            $this->title = $this->lng->txt("obj_" . $this->type);
            $this->setDescription($this->lng->txt("obj_" . $this->type . "_desc"));
        } elseif ($translation_type == "db") {
            $sql =
                "SELECT title, description" . PHP_EOL
                . "FROM object_translation" . PHP_EOL
                . "WHERE obj_id = " . $this->db->quote($this->id, 'integer') . PHP_EOL
                . "AND lang_code = " . $this->db->quote($ilUser->getCurrentLanguage(), 'text') . PHP_EOL
            ;
            $r = $this->db->query($sql);
            $row = $r->fetchRow(ilDBConstants::FETCHMODE_OBJECT);
            if ($row) {
                $this->title = (string) $row->title;
                $this->setDescription((string) $row->description);
            }
        }

        $this->object_properties = null;
    }

    public function getId(): int
    {
        return $this->id;
    }

    public function setId(int $id): void
    {
        $this->id = $id;
    }

    final public function setRefId(int $ref_id): void
    {
        $this->ref_id = $ref_id;
        $this->referenced = true;
    }

    final public function getRefId(): int
    {
        return $this->ref_id ?? 0;
    }

    public function getType(): string
    {
        return $this->type;
    }

    final public function setType(string $type): void
    {
        $this->type = $type;
    }

    public function getPresentationTitle(): string
    {
        return $this->getTitle();
    }

    public function getTitle(): string
    {
        return $this->title;
    }

    final public function getUntranslatedTitle(): string
    {
        return $this->untranslatedTitle;
    }

    final public function setTitle(string $title): void
    {
        $property = $this->getObjectProperties()->getPropertyTitleAndDescription()->withTitle(
            ilStr::shortenTextExtended($title, $this->max_title ?? self::TITLE_LENGTH, $this->add_dots)
        );

        $this->object_properties = $this->getObjectProperties()->withPropertyTitleAndDescription($property);

        $this->title = $property->getTitle();

        // WebDAV needs to access the untranslated title of an object
        $this->untranslatedTitle = $this->title;
    }

    final public function getDescription(): string
    {
        return $this->desc;
    }

    final public function setDescription(string $description): void
    {
        $property = $this->getObjectProperties()
            ->getPropertyTitleAndDescription()->withDescription($description);

        $this->object_properties = $this->getObjectProperties()->withPropertyTitleAndDescription($property);

        // Shortened form is storted in object_data. Long form is stored in object_description
        $this->desc = $property->getDescription();
        $this->long_desc = $property->getLongDescription();
    }

    public function getLongDescription(): string
    {
        if ($this->long_desc !== '') {
            return $this->long_desc;
        }

        if ($this->desc !== '') {
            return $this->desc;
        }
        return '';
    }

    final public function getImportId(): string
    {
        return $this->import_id;
    }

    final public function setImportId(string $import_id): void
    {
        $this->object_properties = $this->getObjectProperties()->withImportId($import_id);
        $this->import_id = $import_id;
    }

    final public static function _lookupObjIdByImportId(string $import_id): int
    {
        global $DIC;
        $db = $DIC->database();

        $sql =
            "SELECT obj_id" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . "WHERE import_id = " . $db->quote($import_id, "text") . PHP_EOL
            . "ORDER BY create_date DESC" . PHP_EOL
        ;
        $result = $db->query($sql);

        if ($db->numRows($result) == 0) {
            return 0;
        }

        $row = $db->fetchObject($result);

        return (int) $row->obj_id;
    }

    public function setOfflineStatus(bool $status): void
    {
        $property_is_online = $this->getObjectProperties()->getPropertyIsOnline()->withOnline();
        if ($status) {
            $property_is_online = $property_is_online->withOffline();
        }

        $this->object_properties = $this->getObjectProperties()->withPropertyIsOnline($property_is_online);
    }

    public function getOfflineStatus(): bool
    {
        return !$this->getObjectProperties()->getPropertyIsOnline()->getIsOnline();
    }

    public function supportsOfflineHandling(): bool
    {
        return $this->obj_definition->supportsOfflineHandling($this->getType());
    }

    public static function _lookupImportId(int $obj_id): string
    {
        global $DIC;

        $db = $DIC->database();

        $sql =
            "SELECT import_id" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . "WHERE obj_id = " . $db->quote($obj_id, "integer") . PHP_EOL
        ;

        $res = $db->query($sql);
        while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
            return (string) $row->import_id;
        }
        return '';
    }

    final public function getOwner(): int
    {
        return $this->owner;
    }

    final public function getOwnerName(): string
    {
        return ilObject::_lookupOwnerName($this->getOwner());
    }

    final public static function _lookupOwnerName(int $owner_id): string
    {
        global $DIC;
        $lng = $DIC->language();

        $owner = null;
        if ($owner_id != -1) {
            if (ilObject::_exists($owner_id)) {
                $owner = new ilObjUser($owner_id);
            }
        }

        $own_name = $lng->txt("unknown");
        if (is_object($owner)) {
            $own_name = $owner->getFullname();
        }

        return $own_name;
    }

    final public function setOwner(int $usr_id): void
    {
        $this->owner = $usr_id;
    }

    final public function getCreateDate(): string
    {
        return $this->create_date;
    }

    final public function getLastUpdateDate(): string
    {
        return $this->last_update;
    }


    public function create(): int
    {
        global $DIC;
        $user = $DIC["ilUser"];

        if (!isset($this->type)) {
            $message = sprintf("%s::create(): No object type given!", get_class($this));
            $this->error->raiseError($message, $this->error->WARNING);
        }

        $this->log->write("ilObject::create(), start");

        // determine owner
        $owner = 0;
        if ($this->getOwner() > 0) {
            $owner = $this->getOwner();
        } elseif (is_object($user)) {
            $owner = $user->getId();
        }

        $this->id = $this->db->nextId(self::TABLE_OBJECT_DATA);
        $values = [
            "obj_id" => ["integer", $this->getId()],
            "type" => ["text", $this->getType()],
            "title" => ["text", $this->getTitle()],
            "description" => ["text", $this->getDescription()],
            "owner" => ["integer", $owner],
            "create_date" => ["date", $this->db->now()],
            "last_update" => ["date", $this->db->now()],
            "import_id" => ["text", $this->getImportId()],
        ];

        $this->db->insert(self::TABLE_OBJECT_DATA, $values);
        $this->object_properties = null;

        // Save long form of description if is rbac object
        if ($this->obj_definition->isRBACObject($this->getType())) {
            $values = [
                'obj_id' => ['integer',$this->id],
                'description' => ['clob', $this->getLongDescription()]
            ];
            $this->db->insert('object_description', $values);
        }

        if ($this->supportsOfflineHandling()) {
            $property_is_online = $this->getObjectProperties()->getPropertyIsOnline()->withOffline();
            $this->getObjectProperties()->storePropertyIsOnline($property_is_online);
        }

        if ($this->obj_definition->isOrgUnitPermissionType($this->type)) {
            ilOrgUnitGlobalSettings::getInstance()->saveDefaultPositionActivationStatus($this->id);
        }

        // the line ($this->read();) messes up meta data handling: meta data,
        // that is not saved at this time, gets lost, so we query for the dates alone
        $sql =
            "SELECT last_update, create_date" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . "WHERE obj_id = " . $this->db->quote($this->id, "integer") . PHP_EOL
        ;
        $obj_set = $this->db->query($sql);
        $obj_rec = $this->db->fetchAssoc($obj_set);
        $this->last_update = $obj_rec["last_update"];
        $this->create_date = $obj_rec["create_date"];

        // set owner for new objects
        $this->setOwner($owner);

        // write log entry
        $this->log->write(
            sprintf(
                "ilObject::create(), finished, obj_id: %s, type: %s, title: %s",
                $this->getId(),
                $this->getType(),
                $this->getTitle()
            )
        );

        $this->app_event_handler->raise(
            'components/ILIAS/ILIASObject',
            'create',
            [
                'obj_id' => $this->id,
                'obj_type' => $this->type
            ]
        );

        return $this->id;
    }

    public function update(): bool
    {
        $this->getObjectProperties()->storeCoreProperties();

        $this->app_event_handler->raise(
            'components/ILIAS/ILIASObject',
            'update',
            [
                'obj_id' => $this->getId(),
                'obj_type' => $this->getType(),
                'ref_id' => $this->getRefId()
            ]
        );

        return true;
    }

    final public function MDUpdateListener(string $element): void
    {
        if ($this->beforeMDUpdateListener($element)) {
            $this->app_event_handler->raise(
                'components/ILIAS/ILIASObject',
                'update',
                ['obj_id' => $this->getId(),
                      'obj_type' => $this->getType(),
                      'ref_id' => $this->getRefId()
                ]
            );

            // Update Title and description
            if ($element == 'General') {
                $paths = $this->lom_services->paths();
                $reader = $this->lom_services->read(
                    $this->getId(),
                    0,
                    $this->getType(),
                    $paths->custom()->withNextStep('general')->get()
                );

                $this->setTitle($reader->firstData($paths->title())->value());
                $this->setDescription($reader->firstData($paths->descriptions())->value());

                $this->update();
            }
            $this->doMDUpdateListener($element);
        }
    }

    protected function doMDUpdateListener(string $a_element): void
    {
    }

    protected function beforeMDUpdateListener(string $a_element): bool
    {
        return true;
    }

    final public function createMetaData(): void
    {
        if ($this->beforeCreateMetaData()) {
            global $DIC;
            $ilUser = $DIC["ilUser"];

            $this->lom_services->derive()->fromBasicProperties(
                $this->getTitle(),
                $this->getLongDescription(),
                $ilUser->getPref('language')
            )->forObject($this->getId(), 0, $this->getType());

            $this->doCreateMetaData();
        }
    }

    protected function doCreateMetaData(): void
    {
    }

    protected function beforeCreateMetaData(): bool
    {
        return true;
    }

    final public function updateMetaData(): void
    {
        if ($this->beforeUpdateMetaData()) {
            $paths = $this->lom_services->paths();

            $manipulator = $this->lom_services->manipulate($this->getId(), 0, $this->getType())
                ->prepareCreateOrUpdate($paths->title(), $this->getTitle());

            if ($this->getDescription() !== '') {
                $manipulator = $manipulator->prepareCreateOrUpdate(
                    $paths->firstDescription(),
                    $this->getLongDescription()
                );
            } else {
                $manipulator = $manipulator->prepareDelete($paths->firstDescription());
            }

            $manipulator->execute();
            $this->doUpdateMetaData();
        }
    }

    protected function doUpdateMetaData(): void
    {
    }

    protected function beforeUpdateMetaData(): bool
    {
        return true;
    }

    final public function deleteMetaData(): void
    {
        if ($this->beforeDeleteMetaData()) {
            $this->lom_services->deleteAll($this->getId(), 0, $this->getType());
            $this->doDeleteMetaData();
        }
    }

    protected function doDeleteMetaData(): void
    {
    }

    protected function beforeDeleteMetaData(): bool
    {
        return true;
    }

    final public function updateOwner(): void
    {
        $values = [
            "owner" => ["integer", $this->getOwner()],
            "last_update" => ["date", $this->db->now()]
        ];

        $where = [
            "obj_id" => ["integer", $this->getId()]
        ];

        $this->db->update(self::TABLE_OBJECT_DATA, $values, $where);

        // get current values from database so last_update is updated as well
        $this->read();
    }

    final public static function _getIdForImportId(string $import_id): int
    {
        global $DIC;
        $db = $DIC->database();
        $db->setLimit(1, 0);

        $sql =
            "SELECT obj_id" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . "WHERE import_id = " . $db->quote($import_id, "text") . PHP_EOL
            . "ORDER BY create_date DESC" . PHP_EOL
        ;

        $result = $db->query($sql);

        if ($row = $db->fetchAssoc($result)) {
            return (int) $row["obj_id"];
        }

        return 0;
    }

    final public static function _getAllReferences(int $id): array
    {
        global $DIC;
        $db = $DIC->database();

        $sql =
            "SELECT ref_id" . PHP_EOL
            . "FROM object_reference" . PHP_EOL
            . "WHERE obj_id = " . $db->quote($id, 'integer') . PHP_EOL
        ;

        $result = $db->query($sql);

        $ref = [];
        while ($row = $db->fetchAssoc($result)) {
            $ref[(int) $row["ref_id"]] = (int) $row["ref_id"];
        }

        return $ref;
    }

    public static function _lookupTitle(int $obj_id): string
    {
        global $DIC;
        return (string) $DIC["ilObjDataCache"]->lookupTitle($obj_id);
    }

    public static function lookupOfflineStatus(int $obj_id): bool
    {
        global $DIC;
        return $DIC['ilObjDataCache']->lookupOfflineStatus($obj_id);
    }

    final public static function _lookupOwner(int $obj_id): int
    {
        global $DIC;
        return (int) $DIC["ilObjDataCache"]->lookupOwner($obj_id);
    }

    final public static function _getIdsForTitle(string $title, string $type = '', bool $partial_match = false): array
    {
        global $DIC;
        $db = $DIC->database();

        $where = "title = " . $db->quote($title, "text");
        if ($partial_match) {
            $where = $db->like("title", "text", '%' . $title . '%');
        }

        $sql =
            "SELECT obj_id" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . "WHERE " . $where . PHP_EOL
        ;

        if ($type != '') {
            $sql .= " AND type = " . $db->quote($type, "text");
        }

        $result = $db->query($sql);

        $object_ids = [];
        while ($row = $db->fetchAssoc($result)) {
            $object_ids[] = (int) $row['obj_id'];
        }

        return $object_ids;
    }

    final public static function _lookupDescription(int $obj_id): string
    {
        global $DIC;
        return (string) $DIC["ilObjDataCache"]->lookupDescription($obj_id);
    }

    final public static function _lookupLastUpdate(int $obj_id, bool $formatted = false): string
    {
        global $DIC;

        $last_update = $DIC["ilObjDataCache"]->lookupLastUpdate($obj_id);

        if ($formatted) {
            return ilDatePresentation::formatDate(new ilDateTime($last_update, IL_CAL_DATETIME));
        }

        return (string) $last_update;
    }

    final public static function _getLastUpdateOfObjects(array $obj_ids): string
    {
        global $DIC;
        $db = $DIC->database();

        $sql =
            "SELECT MAX(last_update) as last_update" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . "WHERE " . $db->in("obj_id", $obj_ids, false, "integer") . PHP_EOL
        ;

        $result = $db->query($sql);
        $row = $db->fetchAssoc($result);

        return (string) $row["last_update"];
    }

    final public static function _lookupObjId(int $ref_id): int
    {
        global $DIC;
        return $DIC["ilObjDataCache"]->lookupObjId($ref_id);
    }

    final public static function _setDeletedDate(int $ref_id, int $deleted_by): void
    {
        global $DIC;
        $db = $DIC->database();

        $values = [
            "deleted" => ["date", $db->now()],
            "deleted_by" => ["integer", $deleted_by]
        ];

        $where = [
            "ref_id" => ["integer", $ref_id]
        ];

        $db->update("object_reference", $values, $where);
    }

    public static function setDeletedDates(array $ref_ids, int $user_id): void
    {
        global $DIC;
        $db = $DIC->database();

        $sql =
            "UPDATE object_reference" . PHP_EOL
            . "SET deleted = " . $db->now() . ", " . PHP_EOL
            . "deleted_by = " . $db->quote($user_id, "integer") . PHP_EOL
            . "WHERE " . $db->in("ref_id", $ref_ids, false, "integer") . PHP_EOL;

        $db->manipulate($sql);
    }

    final public static function _resetDeletedDate(int $ref_id): void
    {
        global $DIC;
        $db = $DIC->database();

        $values = [
            "deleted" => ["timestamp", null],
            "deleted_by" => ["integer", 0]
        ];

        $where = [
            "ref_id" => ["integer", $ref_id]
        ];

        $db->update("object_reference", $values, $where);
    }

    final public static function _lookupDeletedDate(int $ref_id): ?string
    {
        global $DIC;
        $db = $DIC->database();

        $sql =
            "SELECT deleted" . PHP_EOL
            . "FROM object_reference" . PHP_EOL
            . "WHERE ref_id = " . $db->quote($ref_id, "integer") . PHP_EOL
        ;
        $result = $db->query($sql);
        $row = $db->fetchAssoc($result);

        return $row["deleted"] ?? null;
    }

    final public static function _writeTitle(int $obj_id, string $title): void
    {
        global $DIC;
        $db = $DIC->database();

        $values = [
            "title" => ["text", $title],
            "last_update" => ["date", $db->now()]
        ];

        $where = [
            "obj_id" => ["integer", $obj_id]
        ];

        $db->update(self::TABLE_OBJECT_DATA, $values, $where);
    }

    final public static function _writeDescription(int $obj_id, string $desc): void
    {
        global $DIC;

        $db = $DIC->database();
        $obj_definition = $DIC["objDefinition"];

        $desc = ilStr::shortenTextExtended($desc, self::DESC_LENGTH, true);

        $values = [
            "description" => ["text", $desc],
            "last_update" => ["date", $db->now()]
        ];

        $where = [
            "obj_id" => ["integer", $obj_id]
        ];

        $db->update(self::TABLE_OBJECT_DATA, $values, $where);


        if ($obj_definition->isRBACObject(ilObject::_lookupType($obj_id))) {
            // Update long description
            $sql =
                "SELECT obj_id, description" . PHP_EOL
                . "FROM object_description" . PHP_EOL
                . "WHERE obj_id = " . $db->quote($obj_id, 'integer') . PHP_EOL
            ;
            $result = $db->query($sql);

            if ($result->numRows()) {
                $values = [
                    "description" => ["clob", $desc]
                ];
                $db->update("object_description", $values, $where);
            } else {
                $values = [
                    "description" => ["clob",$desc],
                    "obj_id" => ["integer",$obj_id]
                ];
                $db->insert("object_description", $values);
            }
        }
    }

    final public static function _writeImportId(int $obj_id, string $import_id): void
    {
        global $DIC;
        $db = $DIC->database();

        $values = [
            "import_id" => ["text", $import_id],
            "last_update" => ["date", $db->now()]
        ];

        $where = [
            "obj_id" => ["integer", $obj_id]
        ];

        $db->update(self::TABLE_OBJECT_DATA, $values, $where);
    }

    final public static function _lookupType(int $id, bool $reference = false): string
    {
        global $DIC;

        if ($reference) {
            return $DIC["ilObjDataCache"]->lookupType($DIC["ilObjDataCache"]->lookupObjId($id));
        }

        return $DIC["ilObjDataCache"]->lookupType($id);
    }

    final public static function _isInTrash(int $ref_id): bool
    {
        global $DIC;
        return $DIC->repositoryTree()->isDeleted($ref_id);
    }

    final public static function _hasUntrashedReference(int $obj_id): bool
    {
        $ref_ids = ilObject::_getAllReferences($obj_id);
        foreach ($ref_ids as $ref_id) {
            if (!ilObject::_isInTrash($ref_id)) {
                return true;
            }
        }

        return false;
    }

    final public static function _lookupObjectId(int $ref_id): int
    {
        global $DIC;
        return $DIC["ilObjDataCache"]->lookupObjId($ref_id);
    }

    final public static function _getObjectsDataForType(string $type, bool $omit_trash = false): array
    {
        global $DIC;
        $db = $DIC->database();

        $sql =
            "SELECT obj_id, type, title, description, owner, create_date, last_update, import_id, offline" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . "WHERE type = " . $db->quote($type, "text") . PHP_EOL
        ;
        $result = $db->query($sql);

        $objects = [];
        while ($row = $db->fetchAssoc($result)) {
            if ((!$omit_trash) || ilObject::_hasUntrashedReference((int) $row["obj_id"])) {
                $objects[$row["title"] . "." . $row["obj_id"]] = [
                    "id" => $row["obj_id"],
                    "type" => $row["type"],
                    "title" => $row["title"],
                    "description" => $row["description"]
                ];
            }
        }
        ksort($objects);
        return $objects;
    }


    public function putInTree(int $parent_ref_id): void
    {
        $this->tree->insertNode($this->getRefId(), $parent_ref_id);
        $this->handleAutoRating();

        $log_entry = sprintf(
            "ilObject::putInTree(), parent_ref: %s, ref_id: %s, obj_id: %s, type: %s, title: %s",
            $parent_ref_id,
            $this->getRefId(),
            $this->getId(),
            $this->getType(),
            $this->getTitle()
        );

        $this->log->write($log_entry);

        $this->app_event_handler->raise(
            'components/ILIAS/ILIASObject',
            'putObjectInTree',
            [
                'object' => $this,
                'obj_type' => $this->getType(),
                'obj_id' => $this->getId(),
                'parent_ref_id' => $parent_ref_id
            ]
        );
    }

    public function setPermissions(int $parent_ref_id): void
    {
        $this->setParentRolePermissions($parent_ref_id);
        $this->initDefaultRoles();
    }

    public function setParentRolePermissions(int $parent_ref_id): bool
    {
        $parent_roles = $this->rbac_review->getParentRoleIds($parent_ref_id);
        foreach ($parent_roles as $parent_role) {
            if ($parent_role['obj_id'] == SYSTEM_ROLE_ID) {
                continue;
            }
            $operations = $this->rbac_review->getOperationsOfRole(
                (int) $parent_role['obj_id'],
                $this->getType(),
                (int) $parent_role['parent']
            );
            $this->rbac_admin->grantPermission(
                (int) $parent_role['obj_id'],
                $operations,
                $this->getRefId()
            );
        }
        return true;
    }

    public function createReference(): int
    {
        if (!isset($this->id)) {
            $message = "ilObject::createNewReference(): No obj_id given!";
            $this->error->raiseError($message, $this->error->WARNING);
        }

        $next_id = $this->db->nextId('object_reference');

        $values = [
            "ref_id" => ["integer", $next_id],
            "obj_id" => ["integer", $this->getId()]
        ];

        $this->db->insert("object_reference", $values);

        $this->ref_id = $next_id;
        $this->referenced = true;

        return $this->ref_id;
    }

    final public function countReferences(): int
    {
        if (!isset($this->id)) {
            $message = "ilObject::countReferences(): No obj_id given!";
            $this->error->raiseError($message, $this->error->WARNING);
        }

        $sql =
            "SELECT COUNT(ref_id) num" . PHP_EOL
            . "FROM object_reference" . PHP_EOL
            . "WHERE obj_id = " . $this->db->quote($this->id, 'integer') . PHP_EOL
        ;

        $res = $this->db->query($sql);
        $row = $this->db->fetchObject($res);

        return (int) $row->num;
    }

    public function delete(): bool
    {
        global $DIC;
        $rbac_admin = $DIC["rbacadmin"];

        $remove = false;

        // delete object_data entry
        if ((!$this->referenced) || ($this->countReferences() == 1)) {
            $type = ilObject::_lookupType($this->getId());
            if ($this->type != $type) {
                $log_entry = sprintf(
                    "ilObject::delete(): Type mismatch. Object with obj_id: %s was instantiated by type '%s'. DB type is: %s",
                    $this->id,
                    $this->type,
                    $type
                );

                $this->log->write($log_entry);
                $this->error->raiseError(
                    sprintf("ilObject::delete(): Type mismatch. (%s/%s)", $this->type, $this->id),
                    $this->error->WARNING
                );
            }

            $this->app_event_handler->raise('components/ILIAS/ILIASObject', 'beforeDeletion', ['object' => $this]);

            $this->getObjectProperties()->deletePropertyTranslations();

            $sql =
                "DELETE FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
                . "WHERE obj_id = " . $this->db->quote($this->getId(), "integer") . PHP_EOL
            ;
            $this->db->manipulate($sql);

            $sql =
                "DELETE FROM object_description" . PHP_EOL
                . "WHERE obj_id = " . $this->db->quote($this->getId(), "integer") . PHP_EOL
            ;
            $this->db->manipulate($sql);

            $this->log->write(
                sprintf(
                    "ilObject::delete(), deleted object, obj_id: %s, type: %s, title: %s",
                    $this->getId(),
                    $this->getType(),
                    $this->getTitle()
                )
            );

            // keep log of core object data
            ilObjectDataDeletionLog::add($this);

            // remove news
            $news_item = new ilNewsItem();
            $news_item->deleteNewsOfContext($this->getId(), $this->getType());
            ilBlockSetting::_deleteSettingsOfBlock($this->getId(), "news");

            ilDidacticTemplateObjSettings::deleteByObjId($this->getId());

            // BEGIN WebDAV: Delete WebDAV properties
            $sql =
                "DELETE FROM dav_property" . PHP_EOL
                . "WHERE obj_id = " . $this->db->quote($this->getId(), 'integer') . PHP_EOL
            ;
            $this->db->manipulate($sql);
            // END WebDAV: Delete WebDAV properties

            ilECSImportManager::getInstance()->_deleteByObjId($this->getId());
            ilAdvancedMDValues::_deleteByObjId($this->getId());
            ilLPObjSettings::_deleteByObjId($this->getId());

            $remove = true;
        } else {
            $this->log->write(
                sprintf(
                    "ilObject::delete(), object not deleted, number of references: %s, obj_id: %s, type: %s, title: %s",
                    $this->countReferences(),
                    $this->getId(),
                    $this->getType(),
                    $this->getTitle()
                )
            );
        }

        // delete object_reference entry
        if ($this->referenced) {
            ilObjectActivation::deleteAllEntries($this->getRefId());

            $this->app_event_handler->raise('components/ILIAS/ILIASObject', 'deleteReference', ['ref_id' => $this->getRefId()]);

            $sql =
                "DELETE FROM object_reference" . PHP_EOL
                . "WHERE ref_id = " . $this->db->quote($this->getRefId(), 'integer') . PHP_EOL
            ;
            $this->db->manipulate($sql);

            $this->log->write(
                sprintf(
                    "ilObject::delete(), reference deleted, ref_id: %s, obj_id: %s, type: %s, title: %s",
                    $this->getRefId(),
                    $this->getId(),
                    $this->getType(),
                    $this->getTitle()
                )
            );

            // DELETE PERMISSION ENTRIES IN RBAC_PA
            // DONE: method overwritten in ilObjRole & ilObjUser.
            // this call only applies for objects in rbac (not usr,role,rolt)
            // TODO: Do this for role templates too
            $rbac_admin->revokePermission($this->getRefId(), 0, false);

            ilRbacLog::delete($this->getRefId());

            // Remove applied didactic template setting
            ilDidacticTemplateObjSettings::deleteByRefId($this->getRefId());
        }

        // remove conditions
        if ($this->referenced) {
            $ch = new ilConditionHandler();
            $ch->delete($this->getRefId());
            unset($ch);
        }

        return $remove;
    }

    public function initDefaultRoles(): void
    {
    }

    public function applyDidacticTemplate(int $tpl_id): void
    {
        ilLoggerFactory::getLogger('obj')->debug('Applying didactic template with id: ' . $tpl_id);
        if ($tpl_id) {
            foreach (ilDidacticTemplateActionFactory::getActionsByTemplateId($tpl_id) as $action) {
                $action->setRefId($this->getRefId());
                $action->apply();
            }
        }

        ilDidacticTemplateObjSettings::assignTemplate($this->getRefId(), $this->getId(), $tpl_id);
    }

    public static function _exists(int $id, bool $reference = false, ?string $type = null): bool
    {
        global $DIC;
        $db = $DIC->database();

        if ($reference) {
            $sql =
                "SELECT object_data.obj_id" . PHP_EOL
                . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
                . "LEFT JOIN object_reference ON object_reference.obj_id = object_data.obj_id " . PHP_EOL
                . "WHERE object_reference.ref_id= " . $db->quote($id, "integer") . PHP_EOL
            ;
        } else {
            $sql =
                "SELECT object_data.obj_id" . PHP_EOL
                . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
                . "WHERE obj_id = " . $db->quote($id, "integer") . PHP_EOL
            ;
        }

        if ($type) {
            $sql .= " AND object_data.type = " . $db->quote($type, "text") . PHP_EOL;
        }

        $result = $db->query($sql);

        return (bool) $db->numRows($result);
    }

    public function getXMLZip(): string
    {
        return "";
    }
    public function getHTMLDirectory(): bool
    {
        return false;
    }

    final public static function _getObjectsByType(string $obj_type = "", ?int $owner = null): array
    {
        global $DIC;
        $db = $DIC->database();

        $order = " ORDER BY title";

        $where = "";
        if ($obj_type) {
            $where = "WHERE type = " . $db->quote($obj_type, "text");

            if (!is_null($owner)) {
                $where .= " AND owner = " . $db->quote($owner, "integer");
            }
        }

        $sql =
            "SELECT obj_id, type, title, description, owner, create_date, last_update, import_id, offline" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . $where . PHP_EOL
            . $order . PHP_EOL
        ;
        $result = $db->query($sql);

        $arr = [];
        if ($db->numRows($result) > 0) {
            while ($row = $db->fetchAssoc($result)) {
                $row["desc"] = $row["description"];
                $arr[$row["obj_id"]] = $row;
            }
        }

        return $arr;
    }

    final public static function _prepareCloneSelection(
        array $ref_ids,
        string $new_type,
        bool $show_path = true
    ): array {
        global $DIC;

        $db = $DIC->database();
        $lng = $DIC->language();
        $obj_definition = $DIC["objDefinition"];

        $sql =
            "SELECT obj_data.title obj_title, path_data.title path_title, child" . PHP_EOL
            . "FROM tree " . PHP_EOL
            . "JOIN object_reference obj_ref ON child = obj_ref.ref_id " . PHP_EOL
            . "JOIN object_data obj_data ON obj_ref.obj_id = obj_data.obj_id " . PHP_EOL
            . "JOIN object_reference path_ref ON parent = path_ref.ref_id " . PHP_EOL
            . "JOIN object_data path_data ON path_ref.obj_id = path_data.obj_id " . PHP_EOL
            . "WHERE " . $db->in("child", $ref_ids, false, "integer") . PHP_EOL
            . "ORDER BY obj_data.title" . PHP_EOL
        ;
        $res = $db->query($sql);

        if (!$obj_definition->isPlugin($new_type)) {
            $options[0] = $lng->txt('obj_' . $new_type . '_select');
        } else {
            $options[0] = ilObjectPlugin::lookupTxtById($new_type, "obj_" . $new_type . "_select");
        }

        while ($row = $db->fetchObject($res)) {
            if (strlen($title = $row->obj_title) > 40) {
                $title = substr($title, 0, 40) . '...';
            }

            if ($show_path) {
                if (strlen($path = $row->path_title) > 40) {
                    $path = substr($path, 0, 40) . '...';
                }

                $title .= ' (' . $lng->txt('path') . ': ' . $path . ')';
            }

            $options[$row->child] = $title;
        }
        return $options ?: [];
    }

    public function cloneObject(int $target_id, int $copy_id = 0, bool $omit_tree = false): ?ilObject
    {
        global $DIC;

        $ilUser = $DIC["ilUser"];
        $rbac_admin = $DIC["rbacadmin"];

        $class_name = ('ilObj' . $this->obj_definition->getClassName($this->getType()));

        $options = ilCopyWizardOptions::_getInstance($copy_id);

        $this->obj_log->debug($this->getTitle());
        $this->obj_log->debug("isTreeCopyDisabled: " . $options->isTreeCopyDisabled());
        $this->obj_log->debug("omit_tree: " . $omit_tree);

        $new_obj = new $class_name(0, false);
        $new_obj->setOwner($ilUser->getId());
        $new_obj->title = $this->getTitle();
        $new_obj->long_desc = $this->getLongDescription();
        $new_obj->desc = $this->getDescription();
        $new_obj->type = $this->getType();

        // Choose upload mode to avoid creation of additional settings, db entries ...
        $new_obj->create(true);

        if (!$options->isTreeCopyDisabled() && !$omit_tree) {
            $title_with_suffix = $this->appendCopyInfo($target_id, $copy_id, $new_obj->getId());
            $title = mb_strlen($title_with_suffix) < self::TITLE_LENGTH ? $title_with_suffix : $title;
            $this->obj_log->debug("title incl. copy info: " . $title);
            $new_obj->setTitle($title);
            $new_obj->update();
        }

        if ($this->supportsOfflineHandling()) {
            if ($options->isRootNode($this->getRefId())) {
                $new_obj->getObjectProperties()->storePropertyIsOnline(
                    $new_obj->getObjectProperties()->getPropertyIsOnline()->withOffline()
                );
            } else {
                $new_obj->getObjectProperties()->storePropertyIsOnline(
                    $this->getObjectProperties()->getPropertyIsOnline()
                );
            }
        }

        if (!$options->isTreeCopyDisabled() && !$omit_tree) {
            ilLoggerFactory::getLogger('obj')->debug('Tree copy is enabled');
            $new_obj->createReference();
            $new_obj->putInTree($target_id);
            $new_obj->setPermissions($target_id);

            // when copying from personal workspace we have no current ref id
            if ($this->getRefId()) {
                // copy local roles
                $rbac_admin->copyLocalRoles($this->getRefId(), $new_obj->getRefId());
            }
        } else {
            ilLoggerFactory::getLogger('obj')->debug('Tree copy is disabled');
        }

        ilAdvancedMDValues::_cloneValues($copy_id, $this->getId(), $new_obj->getId());

        // BEGIN WebDAV: Clone WebDAV properties
        $sql =
            "INSERT INTO dav_property" . PHP_EOL
            . "(obj_id, node_id, ns, name, value)" . PHP_EOL
            . "SELECT " . $this->db->quote($new_obj->getId(), 'integer') . ", node_id, ns, name, value " . PHP_EOL
            . "FROM dav_property" . PHP_EOL
            . "WHERE obj_id = " . $this->db->quote($this->getId(), 'integer') . PHP_EOL
        ;
        $this->db->manipulate($sql);
        // END WebDAV: Clone WebDAV properties

        $customIconFactory = $DIC['object.customicons.factory'];
        $customIcon = $customIconFactory->getByObjId($this->getId(), $this->getType());
        $customIcon->copy($new_obj->getId());

        $new_obj->getObjectProperties()->storePropertyTileImage(
            $new_obj->getObjectProperties()->getPropertyTileImage()->withTileImage(
                $this->getObjectProperties()->getPropertyTileImage()
                    ->getTileImage()->cloneFor($new_obj->getId())
            )
        );

        $this->app_event_handler->raise(
            'components/ILIAS/ILIASObject',
            'cloneObject',
            [
                'object' => $new_obj,
                'cloned_from_object' => $this,
            ]
        );

        return $new_obj;
    }

    final public function appendCopyInfo(
        int $target_id,
        int $copy_id,
        int $new_obj_id
    ): string {
        $cp_options = ilCopyWizardOptions::_getInstance($copy_id);
        if (!$cp_options->isRootNode($this->getRefId())) {
            return $this->getTitle();
        }


        $obj_translations = $this->getObjectProperties()->clonePropertyTranslations($new_obj_id);

        $other_children_of_same_type = $this->tree->getChildsByType($target_id, $this->type);

        if ($obj_translations->getLanguages() === []) {
            $existing_titles = array_map(
                fn(array $child): string => $child['title'],
                $other_children_of_same_type
            );

            return $this->appendNumberOfCopiesToTitle(
                $this->lng->txt('copy_of_suffix'),
                $this->lng->txt('copy_n_of_suffix'),
                $this->getTitle(),
                $existing_titles
            );
        }

        return $this->appendCopyInfoToTranslations($obj_translations, $other_children_of_same_type);
    }

    private function appendCopyInfoToTranslations(
        Translations $obj_translations,
        array $other_children_of_same_type
    ): string {
        $nodes_translations = array_map(
            fn(array $child): Translations =>
                $this->translations_repository->getFor($child['obj_id']),
            $other_children_of_same_type
        );

        $title_translations_per_lang = array_reduce(
            $nodes_translations,
            $this->getCallbackForTitlesPerLanguageTransformation(),
            []
        );

        $installed_langs = $this->lng->getInstalledLanguages();
        foreach ($obj_translations->getLanguages() as $language) {
            $lang_code = $language->getLanguageCode();
            $suffix_lang = $lang_code;
            if (!in_array($suffix_lang, $installed_langs)) {
                $suffix_lang = $this->lng->getDefaultLanguage();
            }
            $obj_translations = $obj_translations->withLanguage(
                $language->withTitle(
                    $this->appendNumberOfCopiesToTitle(
                        $this->lng->txtlng('common', 'copy_of_suffix', $suffix_lang),
                        $this->lng->txtlng('common', 'copy_n_of_suffix', $suffix_lang),
                        $language->getTitle(),
                        $title_translations_per_lang[$lang_code] ?? []
                    )
                )
            );
        }

        $this->translations_repository->store($obj_translations);

        return $obj_translations->getDefaultTitle();
    }

    private function getCallbackForTitlesPerLanguageTransformation(): callable
    {
        return function (array $npl, ?Translations $nt): array {
            $langs = $nt->getLanguages();
            foreach ($langs as $lang) {
                if (!array_key_exists($lang->getLanguageCode(), $npl)) {
                    $npl[$lang->getLanguageCode()] = [];
                }
                $npl[$lang->getLanguageCode()][] = $lang->getTitle();
            }
            return $npl;
        };
    }

    private function appendNumberOfCopiesToTitle(
        string $copy_suffix,
        string $copy_n_suffix,
        string $title,
        array $other_titles_for_lang
    ): string {
        $title_without_suffix = $this->buildTitleWithoutCopySuffix($copy_suffix, $copy_n_suffix, $title);
        $title_with_suffix = "{$title_without_suffix} {$copy_suffix}";
        if ($other_titles_for_lang === []
            || $this->isTitleUnique($title_with_suffix, $other_titles_for_lang)) {
            return $title_with_suffix;
        }

        for ($i = 2;true;$i++) {
            $title_with_suffix = $title_without_suffix . ' ' . sprintf($copy_n_suffix, $i);
            if ($this->isTitleUnique($title_with_suffix, $other_titles_for_lang)) {
                return $title_with_suffix;
            }
        }
    }

    private function isTitleUnique(string $title, array $nodes): bool
    {
        foreach ($nodes as $node) {
            if (($title === $node)) {
                return false;
            }
        }
        return true;
    }

    private function buildTitleWithoutCopySuffix(string $copy_suffix, string $copy_n_suffix, string $title): string
    {
        /*
         * create a regular expression from the language text copy_n_of_suffix, so that
         * we can match it against $filenameWithoutExtension, and retrieve the number of the copy.
         * for example, if copy_n_of_suffix is 'Copy (%1s)', this creates the regular
         * expression '/ Copy \\([0-9]+)\\)$/'.
         */
        $regexp_for_suffix = preg_replace(
            '/([\^$.\[\]|()?*+{}])/',
            '\\\\${1}',
            ' '
            . $copy_n_suffix
        );
        $regexp_for_file_name = '/' . preg_replace('/%1\\\\\$s/', '([0-9]+)', $regexp_for_suffix) . '$/';

        if (preg_match($regexp_for_file_name, $title, $matches)) {
            return substr($title, 0, -strlen($matches[0]));
        }

        if (str_ends_with($title, " {$copy_suffix}")) {
            return substr(
                $title,
                0,
                -strlen(
                    " {$copy_suffix}"
                )
            );
        }

        return $title;
    }

    public function cloneDependencies(int $target_id, int $copy_id): bool
    {
        ilConditionHandler::cloneDependencies($this->getRefId(), $target_id, $copy_id);

        $tpl_id = ilDidacticTemplateObjSettings::lookupTemplateId($this->getRefId());
        if ($tpl_id) {
            $factory = new ilObjectFactory();
            $obj = $factory->getInstanceByRefId($target_id, false);
            if ($obj instanceof ilObject) {
                $obj->applyDidacticTemplate($tpl_id);
            }
        }
        return true;
    }

    public function cloneMetaData(ilObject $target_obj): bool
    {
        $this->lom_services->derive()
                           ->fromObject($this->getId(), 0, $this->getType())
                           ->forObject($target_obj->getId(), 0, $target_obj->getType());
        return true;
    }

    public static function getIconForReference(
        int $ref_id,
        int $obj_id,
        string $size,
        string $type = "",
        bool $offline = false
    ): string {
        global $DIC;
        $icon_factory = $DIC['ui.factory']->symbol()->icon();
        $irss = $DIC['resource_storage'];

        if ($obj_id == "" && $type == "") {
            return "";
        }

        if ($type === "") {
            $type = ilObject::_lookupType($obj_id);
        }

        if ($size === "") {
            $size = "big";
        }

        if ($obj_id) {
            $property_icon = LocalDIC::dic()['properties.additional.repository']->getFor($obj_id)->getPropertyIcon();
            $custom_icon = $property_icon->getCustomIcon();
            if ($custom_icon?->exists()) {
                return $custom_icon->getFullPath() . '?tmp=' . filemtime($custom_icon->getFullPath());
            }

            $file_type_specific_icon = $property_icon->getObjectTypeSpecificIcon($obj_id, $icon_factory, $irss);
            if ($file_type_specific_icon !== null) {
                return $file_type_specific_icon->getIconPath();
            }

            $dtpl_icon_factory = ilDidacticTemplateIconFactory::getInstance();
            if ($ref_id) {
                $path = $dtpl_icon_factory->getIconPathForReference($ref_id);
            } else {
                $path = $dtpl_icon_factory->getIconPathForObject($obj_id);
            }
            if ($path) {
                return $path . '?tmp=' . filemtime($path);
            }
        }

        if (!$offline) {
            return self::getIconForType($type);
        }
        return "./images/standard/icon_{$type}.svg";
    }

    public static function getIconForType(string $type): string
    {
        global $DIC;
        $objDefinition = $DIC['objDefinition'];
        if (!$objDefinition->isPluginTypeName($type)) {
            return ilUtil::getImagePath("standard/icon_{$type}.svg");
        }

        if ($objDefinition->getClassName($type) !== '') {
            $class_name = "il{$objDefinition->getClassName($type)}Plugin";
            $location = $objDefinition->getLocation($type);
            if (is_file($location . "/class.{$class_name}.php")) {
                return call_user_func([$class_name, '_getIcon'], $type);
            }
        }
        return ilUtil::getImagePath('standard/icon_cmps.svg');
    }

    final public static function _getIcon(
        int $obj_id = 0,
        string $size = "big",
        string $type = "",
        bool $offline = false
    ): string {
        return self::getIconForReference(0, $obj_id, $size, $type, $offline);
    }

    protected function handleAutoRating(): void
    {
        if ($this->process_auto_reating
            && $this->hasAutoRating()
            && method_exists($this, "setRating")
        ) {
            $this->setRating(true);
            $this->update();
        }
    }

    protected function hasAutoRating(): bool
    {
        $ref_id = $this->getRefId();
        $type = $this->type;

        if (!$ref_id || !in_array($type, ["file", "lm", "wiki"])) {
            return false;
        }

        return $this->selfOrParentWithRatingEnabled();
    }

    public function selfOrParentWithRatingEnabled(): bool
    {
        $tree = $this->tree;
        $ref_id = $this->getRefId();
        $parent_ref_id = $tree->checkForParentType($ref_id, "grp");
        if (!$parent_ref_id) {
            $parent_ref_id = $tree->checkForParentType($ref_id, "crs");
        }
        if ($parent_ref_id) {
            // get auto rate setting
            $parent_obj_id = ilObject::_lookupObjId($parent_ref_id);
            return (bool) ilContainer::_lookupContainerSetting(
                $parent_obj_id,
                ilObjectServiceSettingsGUI::AUTO_RATING_NEW_OBJECTS
            );
        }
        return false;
    }

    public static function collectDeletionDependencies(
        array &$deps,
        int $ref_id,
        int $obj_id,
        string $type,
        int $depth = 0
    ): void {
        global $DIC;

        $objDefinition = $DIC["objDefinition"];
        $tree = $DIC->repositoryTree();

        if ($depth == 0) {
            $deps["dep"] = [];
        }

        $deps["del_ids"][$obj_id] = $obj_id;

        if (!$objDefinition->isPluginTypeName($type)) {
            $class_name = "ilObj" . $objDefinition->getClassName($type);
            $odeps = call_user_func([$class_name, "getDeletionDependencies"], $obj_id);
            if (is_array($odeps)) {
                foreach ($odeps as $id => $message) {
                    $deps["dep"][$id][$obj_id][] = $message;
                }
            }

            // get deletion dependency of children
            foreach ($tree->getChilds($ref_id) as $c) {
                ilObject::collectDeletionDependencies($deps, (int) $c["child"], (int) $c["obj_id"], (string) $c["type"], $depth + 1);
            }
        }

        // delete all dependencies to objects that will be deleted, too
        if ($depth == 0) {
            foreach ($deps["del_ids"] as $obj_id) {
                unset($deps["dep"][$obj_id]);
            }
            $deps = $deps["dep"];
        }
    }

    public static function getDeletionDependencies(int $obj_id): array
    {
        return [];
    }

    public static function getLongDescriptions(array $obj_ids): array
    {
        global $DIC;
        $db = $DIC->database();

        $sql =
            "SELECT obj_id, description" . PHP_EOL
            . "FROM object_description" . PHP_EOL
            . "WHERE " . $db->in("obj_id", $obj_ids, false, "integer") . PHP_EOL
        ;
        $result = $db->query($sql);

        $all = [];
        while ($row = $db->fetchAssoc($result)) {
            $all[$row["obj_id"]] = $row["description"];
        }
        return $all;
    }

    public static function getAllOwnedRepositoryObjects(int $user_id): array
    {
        global $DIC;

        $db = $DIC->database();
        $obj_definition = $DIC["objDefinition"];

        // restrict to repository
        $types = array_keys($obj_definition->getSubObjectsRecursively("root"));

        $sql =
            "SELECT od.obj_id, od.type, od.title" . PHP_EOL
            . "FROM object_data od" . PHP_EOL
            . "JOIN object_reference oref ON(oref.obj_id = od.obj_id)" . PHP_EOL
            . "JOIN tree ON (tree.child = oref.ref_id)" . PHP_EOL
        ;

        if ($user_id) {
            $sql .= "WHERE od.owner = " . $db->quote($user_id, "integer") . PHP_EOL;
        } else {
            $sql .=
                "LEFT JOIN usr_data ud ON (ud.usr_id = od.owner)" . PHP_EOL
                . "WHERE (od.owner < " . $db->quote(1, "integer") . PHP_EOL
                . "OR od.owner IS NULL OR ud.login IS NULL)" . PHP_EOL
                . "AND od.owner <> " . $db->quote(-1, "integer") . PHP_EOL
            ;
        }

        $sql .=
            "AND " . $db->in("od.type", $types, false, "text") . PHP_EOL
            . "AND tree.tree > " . $db->quote(0, "integer") . PHP_EOL
        ;

        $res = $db->query($sql);

        $all = [];
        while ($row = $db->fetchAssoc($res)) {
            $all[$row["type"]][$row["obj_id"]] = $row["title"];
        }

        return $all;
    }

    public static function fixMissingTitles($type, array &$obj_title_map)
    {
        global $DIC;
        $db = $DIC->database();

        if (!in_array($type, ["catr", "crsr", "sess", "grpr", "prgr"])) {
            return;
        }

        // any missing titles?
        $missing_obj_ids = [];
        foreach ($obj_title_map as $obj_id => $title) {
            if (!trim($title)) {
                $missing_obj_ids[] = $obj_id;
            }
        }

        if (!sizeof($missing_obj_ids)) {
            return;
        }

        switch ($type) {
            case "grpr":
            case "catr":
            case "crsr":
            case "prgr":
                $sql =
                    "SELECT oref.obj_id, od.type, od.title" . PHP_EOL
                    . "FROM object_data od" . PHP_EOL
                    . "JOIN container_reference oref ON (od.obj_id = oref.target_obj_id)" . PHP_EOL
                    . "AND " . $db->in("oref.obj_id", $missing_obj_ids, false, "integer") . PHP_EOL
                ;
                $result = $db->query($sql);

                while ($row = $db->fetchAssoc($result)) {
                    $obj_title_map[$row["obj_id"]] = $row["title"];
                }
                break;
            case "sess":
                foreach ($missing_obj_ids as $obj_id) {
                    $sess = new ilObjSession($obj_id, false);
                    $obj_title_map[$obj_id] = $sess->getFirstAppointment()->appointmentToString();
                }
                break;
        }
    }

    public static function _lookupCreationDate(int $obj_id): string
    {
        global $DIC;
        $db = $DIC->database();

        $sql =
            "SELECT create_date" . PHP_EOL
            . "FROM " . self::TABLE_OBJECT_DATA . PHP_EOL
            . "WHERE obj_id = " . $db->quote($obj_id, "integer") . PHP_EOL
        ;
        $result = $db->query($sql);
        $rec = $db->fetchAssoc($result);
        return $rec["create_date"];
    }

    public function getPossibleSubObjects(bool $filter = true): array
    {
        return $this->obj_definition->getSubObjects($this->type, $filter);
    }

    public static function _getObjectTypeIdByTitle(string $type, ?\ilDBInterface $ilDB = null): ?int
    {
        if (!$ilDB) {
            global $DIC;
            $ilDB = $DIC->database();
        }

        $sql =
            "SELECT obj_id FROM object_data" . PHP_EOL
            . "WHERE type = 'typ'" . PHP_EOL
            . "AND title = " . $ilDB->quote($type, 'text') . PHP_EOL
        ;

        $res = $ilDB->query($sql);
        if ($ilDB->numRows($res) == 0) {
            return null;
        }

        $row = $ilDB->fetchAssoc($res);
        return (int) $row['obj_id'] ?? null;
    }
} // END class.ilObject