ElggEntity.php

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<?php
 
use Elgg\Database\QueryBuilder;
use Elgg\Exceptions\DatabaseException;
use Elgg\Exceptions\Filesystem\IOException;
use Elgg\Exceptions\DomainException as ElggDomainException;
use Elgg\Exceptions\InvalidArgumentException as ElggInvalidArgumentException;
use Elgg\Traits\Entity\AccessCollections;
use Elgg\Traits\Entity\Annotations;
use Elgg\Traits\Entity\Icons;
use Elgg\Traits\Entity\Metadata;
use Elgg\Traits\Entity\Relationships;
use Elgg\Traits\Entity\Subscriptions;
 
abstract class ElggEntity extends \ElggData {
 
    use AccessCollections;
    use Annotations;
    use Icons;
    use Metadata;
    use Relationships;
    use Subscriptions;
    
    public const PRIMARY_ATTR_NAMES = [
        'guid',
        'type',
        'subtype',
        'owner_guid',
        'container_guid',
        'access_id',
        'time_created',
        'time_updated',
        'last_action',
        'enabled',
        'deleted',
        'time_deleted',
    ];
 
    protected const INTEGER_ATTR_NAMES = [
        'guid',
        'owner_guid',
        'container_guid',
        'access_id',
        'time_created',
        'time_updated',
        'last_action',
        'time_deleted',
    ];
 
    protected $volatile = [];
 
    protected $orig_attributes = [];
 
    protected $_is_cacheable = true;
 
    public function __construct(?\stdClass $row = null) {
        $this->initializeAttributes();
 
        if (!empty($row) && !$this->load($row)) {
            throw new IOException('Failed to load new ' . get_class() . " for GUID: {$row->guid}");
        }
    }
 
    protected function initializeAttributes() {
        parent::initializeAttributes();
 
        $this->attributes['guid'] = null;
        $this->attributes['type'] = null;
        $this->attributes['subtype'] = null;
 
        $this->attributes['owner_guid'] = _elgg_services()->session_manager->getLoggedInUserGuid();
        $this->attributes['container_guid'] = _elgg_services()->session_manager->getLoggedInUserGuid();
 
        $this->attributes['access_id'] = ACCESS_PRIVATE;
        $this->attributes['time_updated'] = null;
        $this->attributes['last_action'] = null;
        $this->attributes['enabled'] = 'yes';
        $this->attributes['deleted'] = 'no';
        $this->attributes['time_deleted'] = null;
    }
 
    public function __clone() {
        $orig_entity = get_entity($this->guid);
        if (!$orig_entity) {
            _elgg_services()->logger->error("Failed to clone entity with GUID $this->guid");
            return;
        }
 
        $metadata_array = elgg_get_metadata([
            'guid' => $this->guid,
            'limit' => false,
        ]);
 
        $this->attributes['guid'] = null;
        $this->attributes['time_created'] = null;
        $this->attributes['time_updated'] = null;
        $this->attributes['last_action'] = null;
 
        $this->attributes['subtype'] = $orig_entity->getSubtype();
 
        // copy metadata over to new entity - slightly convoluted due to
        // handling of metadata arrays
        if (is_array($metadata_array)) {
            // create list of metadata names
            $metadata_names = [];
            foreach ($metadata_array as $metadata) {
                $metadata_names[] = $metadata->name;
            }
            
            // arrays are stored with multiple entries per name
            $metadata_names = array_unique($metadata_names);
 
            // move the metadata over
            foreach ($metadata_names as $name) {
                $this->__set($name, $orig_entity->$name);
            }
        }
    }
 
    public function __set($name, $value) {
        if ($this->$name === $value) {
            // quick return if value is not changing
            return;
        }
 
        if (array_key_exists($name, $this->attributes)) {
            // if an attribute is 1 (integer) and it's set to "1" (string), don't consider that a change.
            if (is_int($this->attributes[$name])
                    && is_string($value)
                    && ((string) $this->attributes[$name] === $value)) {
                return;
            }
 
            // keep original values
            if ($this->guid && !array_key_exists($name, $this->orig_attributes)) {
                $this->orig_attributes[$name] = $this->attributes[$name];
            }
 
            // Certain properties should not be manually changed!
            switch ($name) {
                case 'guid':
                case 'last_action':
                case 'time_deleted':
                case 'time_updated':
                case 'type':
                    return;
                case 'subtype':
                    throw new ElggInvalidArgumentException(elgg_echo('ElggEntity:Error:SetSubtype', ['setSubtype()']));
                case 'enabled':
                    throw new ElggInvalidArgumentException(elgg_echo('ElggEntity:Error:SetEnabled', ['enable() / disable()']));
                case 'deleted':
                    throw new ElggInvalidArgumentException(elgg_echo('ElggEntity:Error:SetDeleted', ['delete() / restore()']));
                case 'access_id':
                case 'owner_guid':
                case 'container_guid':
                    if ($value !== null) {
                        $this->attributes[$name] = (int) $value;
                    } else {
                        $this->attributes[$name] = null;
                    }
                    break;
                default:
                    $this->attributes[$name] = $value;
                    break;
            }
            
            return;
        }
 
        $this->setMetadata($name, $value);
    }
 
    public function getOriginalAttributes(): array {
        return $this->orig_attributes;
    }
 
    public function __get($name) {
        if (array_key_exists($name, $this->attributes)) {
            return $this->attributes[$name];
        }
 
        return $this->getMetadata($name);
    }
 
    public function getDisplayName(): string {
        return (string) $this->name;
    }
 
    public function setDisplayName(string $display_name): void {
        $this->name = $display_name;
    }
 
    public function getVolatileData(string $name) {
        return array_key_exists($name, $this->volatile) ? $this->volatile[$name] : null;
    }
 
    public function setVolatileData(string $name, $value): void {
        $this->volatile[$name] = $value;
    }
 
    public function removeAllRelatedRiverItems(): void {
        elgg_delete_river(['subject_guid' => $this->guid, 'limit' => false]);
        elgg_delete_river(['object_guid' => $this->guid, 'limit' => false]);
        elgg_delete_river(['target_guid' => $this->guid, 'limit' => false]);
    }
 
    public function countComments(): int {
        if (!$this->hasCapability('commentable')) {
            return 0;
        }
        
        $params = ['entity' => $this];
        $num = _elgg_services()->events->triggerResults('comments:count', $this->getType(), $params);
 
        if (is_int($num)) {
            return $num;
        }
        
        return \Elgg\Comments\DataService::instance()->getCommentsCount($this);
    }
 
    public function hasAccess(int $user_guid = 0): bool {
        return _elgg_services()->accessCollections->hasAccessToEntity($this, $user_guid);
    }
 
    public function canEdit(int $user_guid = 0): bool {
        return _elgg_services()->userCapabilities->canEdit($this, $user_guid);
    }
 
    public function canDelete(int $user_guid = 0): bool {
        return _elgg_services()->userCapabilities->canDelete($this, $user_guid);
    }
 
    public function canWriteToContainer(int $user_guid = 0, string $type = '', string $subtype = ''): bool {
        if (empty($type) || empty($subtype)) {
            throw new ElggInvalidArgumentException(__METHOD__ . ' requires $type and $subtype to be set');
        }
        
        return _elgg_services()->userCapabilities->canWriteToContainer($this, $type, $subtype, $user_guid);
    }
 
    public function canComment(int $user_guid = 0): bool {
        return _elgg_services()->userCapabilities->canComment($this, $user_guid);
    }
 
    public function canAnnotate(int $user_guid = 0, string $annotation_name = ''): bool {
        return _elgg_services()->userCapabilities->canAnnotate($this, $user_guid, $annotation_name);
    }
 
    public function getGUID(): ?int {
        return $this->guid;
    }
 
    public function getType(): string {
        return (string) $this->attributes['type'];
    }
 
    public function setSubtype(string $subtype): void {
        // keep original values
        if ($this->guid && !array_key_exists('subtype', $this->orig_attributes)) {
            $this->orig_attributes['subtype'] = $this->attributes['subtype'];
        }
        
        $this->attributes['subtype'] = $subtype;
    }
 
    public function getSubtype(): string {
        return (string) $this->attributes['subtype'];
    }
 
    public function getOwnerGUID(): int {
        return (int) $this->owner_guid;
    }
 
    public function getOwnerEntity(): ?\ElggEntity {
        return $this->owner_guid ? get_entity($this->owner_guid) : null;
    }
 
    public function setContainerGUID(int $container_guid): void {
        $this->container_guid = $container_guid;
    }
 
    public function getContainerGUID(): int {
        return (int) $this->container_guid;
    }
 
    public function getContainerEntity(): ?\ElggEntity {
        return $this->container_guid ? get_entity($this->getContainerGUID()) : null;
    }
 
    public function getTimeUpdated(): int {
        return (int) $this->time_updated;
    }
 
    public function getURL(): string {
        $url = elgg_generate_entity_url($this, 'view');
 
        $url = _elgg_services()->events->triggerResults('entity:url', "{$this->getType()}:{$this->getSubtype()}", ['entity' => $this], $url);
        $url = _elgg_services()->events->triggerResults('entity:url', $this->getType(), ['entity' => $this], $url);
        if (empty($url)) {
            return '';
        }
 
        return elgg_normalize_url($url);
    }
 
    public function save(): bool {
        if ($this->guid > 0) {
            $result = $this->update();
        } else {
            $result = $this->create() !== false;
        }
 
        if ($result) {
            $this->cache();
        }
 
        return $result;
    }
 
    protected function create() {
 
        $type = $this->attributes['type'];
        if (!in_array($type, \Elgg\Config::ENTITY_TYPES)) {
            throw new ElggDomainException('Entity type must be one of the allowed types: ' . implode(', ', \Elgg\Config::ENTITY_TYPES));
        }
 
        $subtype = $this->attributes['subtype'];
        if (!$subtype) {
            throw new ElggInvalidArgumentException('All entities must have a subtype');
        }
 
        $owner_guid = (int) $this->attributes['owner_guid'];
        $access_id = (int) $this->attributes['access_id'];
        $now = $this->getCurrentTime()->getTimestamp();
        $time_created = isset($this->attributes['time_created']) ? (int) $this->attributes['time_created'] : $now;
        $deleted = $this->attributes['deleted'];
        $time_deleted = (int) $this->attributes['time_deleted'];
 
        $container_guid = $this->attributes['container_guid'];
        if ($container_guid == 0) {
            $container_guid = $owner_guid;
            $this->attributes['container_guid'] = $container_guid;
        }
        
        $container_guid = (int) $container_guid;
 
        if ($access_id === ACCESS_DEFAULT) {
            throw new ElggInvalidArgumentException('ACCESS_DEFAULT is not a valid access level. See its documentation in constants.php');
        }
        
        if ($access_id === ACCESS_FRIENDS) {
            throw new ElggInvalidArgumentException('ACCESS_FRIENDS is not a valid access level. See its documentation in constants.php');
        }
 
        $user_guid = _elgg_services()->session_manager->getLoggedInUserGuid();
 
        // If given an owner, verify it can be loaded
        if (!empty($owner_guid)) {
            $owner = $this->getOwnerEntity();
            if (!$owner instanceof \ElggEntity) {
                $error = "User {$user_guid} tried to create a ({$type}, {$subtype}),";
                $error .= " but the given owner {$owner_guid} could not be loaded.";
                throw new ElggInvalidArgumentException($error);
            }
 
            // If different owner than logged in, verify can write to container.
            if ($user_guid !== $owner_guid && !$owner->canEdit() && !$owner->canWriteToContainer($user_guid, $type, $subtype)) {
                $error = "User {$user_guid} tried to create a ({$type}, {$subtype}) with owner {$owner_guid},";
                $error .= " but the user wasn't permitted to write to the owner's container.";
                throw new ElggInvalidArgumentException($error);
            }
        }
 
        // If given a container, verify it can be loaded and that the current user can write to it
        if (!empty($container_guid)) {
            $container = $this->getContainerEntity();
            if (!$container instanceof \ElggEntity) {
                $error = "User {$user_guid} tried to create a ({$type}, {$subtype}),";
                $error .= " but the given container {$container_guid} could not be loaded.";
                throw new ElggInvalidArgumentException($error);
            }
 
            if (!$container->canWriteToContainer($user_guid, $type, $subtype)) {
                $error = "User {$user_guid} tried to create a ({$type}, {$subtype}),";
                $error .= " but was not permitted to write to container {$container_guid}.";
                throw new ElggInvalidArgumentException($error);
            }
        }
        
        if (!_elgg_services()->events->triggerBefore('create', $this->type, $this)) {
            return false;
        }
 
        // Create primary table row
        $guid = _elgg_services()->entityTable->insertRow((object) [
            'type' => $type,
            'subtype' => $subtype,
            'owner_guid' => $owner_guid,
            'container_guid' => $container_guid,
            'access_id' => $access_id,
            'time_created' => $time_created,
            'time_updated' => $now,
            'last_action' => $now,
            'deleted' => $deleted,
            'time_deleted' => $time_deleted
        ], $this->attributes);
 
        if (!$guid) {
            throw new IOException("Unable to save new object's base entity information!");
        }
 
        $this->attributes['subtype'] = $subtype;
        $this->attributes['guid'] = (int) $guid;
        $this->attributes['time_created'] = (int) $time_created;
        $this->attributes['time_updated'] = (int) $now;
        $this->attributes['last_action'] = (int) $now;
        $this->attributes['container_guid'] = (int) $container_guid;
        $this->attributes['deleted'] = $deleted;
        $this->attributes['time_deleted'] = (int) $time_deleted;
 
        // We are writing this new entity to cache to make sure subsequent calls
        // to get_entity() load the entity from cache and not from the DB. This
        // MUST come before the metadata and annotation writes below!
        $this->cache();
 
        // Save any unsaved metadata
        if (count($this->temp_metadata) > 0) {
            foreach ($this->temp_metadata as $name => $value) {
                // temp metadata is always an array, but if there is only one value return just the value
                $this->setMetadata($name, $value, '', count($value) > 1);
            }
 
            $this->temp_metadata = [];
        }
 
        // Save any unsaved annotations.
        if (count($this->temp_annotations) > 0) {
            foreach ($this->temp_annotations as $name => $value) {
                $this->annotate($name, $value);
            }
 
            $this->temp_annotations = [];
        }
        
        if (isset($container) && !$container instanceof \ElggUser) {
            // users have their own logic for setting last action
            $container->updateLastAction();
        }
        
        // for BC reasons this event is still needed (for example for notifications)
        _elgg_services()->events->trigger('create', $this->type, $this);
        
        _elgg_services()->events->triggerAfter('create', $this->type, $this);
 
        return $guid;
    }
 
    protected function update(): bool {
 
        if (!$this->canEdit()) {
            return false;
        }
 
        // give old update event a chance to stop the update
        if (!_elgg_services()->events->trigger('update', $this->type, $this)) {
            return false;
        }
 
        $this->invalidateCache();
 
        // See #6225. We copy these after the update event in case a handler changed one of them.
        $guid = (int) $this->guid;
        $owner_guid = (int) $this->owner_guid;
        $access_id = (int) $this->access_id;
        $container_guid = (int) $this->container_guid;
        $time_created = (int) $this->time_created;
        $time = $this->getCurrentTime()->getTimestamp();
        $deleted = $this->deleted;
        $time_deleted = (int) $this->time_deleted;
 
        if ($access_id == ACCESS_DEFAULT) {
            throw new ElggInvalidArgumentException('ACCESS_DEFAULT is not a valid access level. See its documentation in constants.php');
        }
        
        if ($access_id == ACCESS_FRIENDS) {
            throw new ElggInvalidArgumentException('ACCESS_FRIENDS is not a valid access level. See its documentation in constants.php');
        }
 
        // Update primary table
        $ret = _elgg_services()->entityTable->updateRow($guid, (object) [
            'owner_guid' => $owner_guid,
            'container_guid' => $container_guid,
            'access_id' => $access_id,
            'time_created' => $time_created,
            'time_updated' => $time,
            'guid' => $guid,
            'deleted' => $deleted,
            'time_deleted' => $time_deleted
        ]);
        if ($ret === false) {
            return false;
        }
 
        $this->attributes['time_updated'] = $time;
 
        _elgg_services()->events->triggerAfter('update', $this->type, $this);
 
        $this->orig_attributes = [];
 
        $this->cache();
 
        // Handle cases where there was no error BUT no rows were updated!
        return true;
    }
 
    protected function load(stdClass $row): bool {
        $attributes = array_merge($this->attributes, (array) $row);
 
        if (array_diff(self::PRIMARY_ATTR_NAMES, array_keys($attributes)) !== []) {
            // Some primary attributes are missing
            return false;
        }
 
        foreach ($attributes as $name => $value) {
            if (!in_array($name, self::PRIMARY_ATTR_NAMES)) {
                $this->setVolatileData("select:{$name}", $value);
                unset($attributes[$name]);
                continue;
            }
 
            if (in_array($name, static::INTEGER_ATTR_NAMES)) {
                $attributes[$name] = (int) $value;
            }
        }
 
        $this->attributes = $attributes;
 
        $this->cache();
 
        return true;
    }
 
    public function disable(string $reason = '', bool $recursive = true): bool {
        if (!$this->guid) {
            return false;
        }
 
        if (!_elgg_services()->events->trigger('disable', $this->type, $this)) {
            return false;
        }
 
        if (!$this->canEdit()) {
            return false;
        }
 
        if ($this instanceof ElggUser && !$this->isBanned()) {
            // temporarily ban to prevent using the site during disable
            // not using ban function to bypass events
            $this->setMetadata('banned', 'yes');
            $unban_after = true;
        } else {
            $unban_after = false;
        }
 
        if (!empty($reason)) {
            $this->disable_reason = $reason;
        }
 
        $guid = (int) $this->guid;
 
        if ($recursive) {
            elgg_call(ELGG_IGNORE_ACCESS | ELGG_HIDE_DISABLED_ENTITIES | ELGG_SHOW_DELETED_ENTITIES, function () use ($guid, $reason) {
                $base_options = [
                    'wheres' => [
                        function(QueryBuilder $qb, $main_alias) use ($guid) {
                            return $qb->compare("{$main_alias}.guid", '!=', $guid, ELGG_VALUE_GUID);
                        },
                    ],
                    'limit' => false,
                    'batch' => true,
                    'batch_inc_offset' => false,
                ];
 
                foreach (['owner_guid', 'container_guid'] as $db_column) {
                    $options = $base_options;
                    $options[$db_column] = $guid;
 
                    $subentities = elgg_get_entities($options);
                    /* @var $subentity \ElggEntity */
                    foreach ($subentities as $subentity) {
                        if (!$subentity->isEnabled()) {
                            continue;
                        }
                        
                        $subentity->addRelationship($guid, 'disabled_with');
                        $subentity->disable($reason, true);
                    }
                }
            });
        }
 
        $disabled = _elgg_services()->entityTable->disable($this);
 
        if ($unban_after) {
            $this->setMetadata('banned', 'no');
        }
 
        if ($disabled) {
            $this->invalidateCache();
 
            $this->attributes['enabled'] = 'no';
            _elgg_services()->events->triggerAfter('disable', $this->type, $this);
        }
 
        return $disabled;
    }
 
    public function enable(bool $recursive = true): bool {
        if (empty($this->guid)) {
            return false;
        }
 
        if (!_elgg_services()->events->trigger('enable', $this->type, $this)) {
            return false;
        }
 
        if (!$this->canEdit()) {
            return false;
        }
 
        $result = elgg_call(ELGG_IGNORE_ACCESS | ELGG_SHOW_DISABLED_ENTITIES | ELGG_SHOW_DELETED_ENTITIES, function() use ($recursive) {
            $result = _elgg_services()->entityTable->enable($this);
            
            $this->deleteMetadata('disable_reason');
 
            if ($recursive) {
                $disabled_with_it = elgg_get_entities([
                    'relationship' => 'disabled_with',
                    'relationship_guid' => $this->guid,
                    'inverse_relationship' => true,
                    'limit' => false,
                    'batch' => true,
                    'batch_inc_offset' => false,
                ]);
 
                foreach ($disabled_with_it as $e) {
                    $e->enable($recursive);
                    $e->removeRelationship($this->guid, 'disabled_with');
                }
            }
 
            return $result;
        });
 
        if ($result) {
            $this->attributes['enabled'] = 'yes';
            _elgg_services()->events->triggerAfter('enable', $this->type, $this);
        }
 
        return $result;
    }
 
    public function isEnabled(): bool {
        return $this->enabled == 'yes';
    }
 
    public function delete(bool $recursive = true, ?bool $persistent = null): bool {
        if (!$this->canDelete()) {
            return false;
        }
 
        if (!elgg_get_config('trash_enabled')) {
            $persistent = true;
        }
        
        if (!isset($persistent)) {
            $persistent = !$this->hasCapability('restorable');
        }
        
        try {
            if (empty($this->guid) || $persistent) {
                return $this->persistentDelete($recursive);
            } else {
                return $this->trash($recursive);
            }
        } catch (DatabaseException $ex) {
            elgg_log($ex, \Psr\Log\LogLevel::ERROR);
            return false;
        }
    }
    
    protected function persistentDelete(bool $recursive = true): bool {
        return _elgg_services()->entityTable->delete($this, $recursive);
    }
    
    protected function trash(bool $recursive = true): bool {
        $result = _elgg_services()->entityTable->trash($this, $recursive);
        if ($result) {
            $this->attributes['deleted'] = 'yes';
        }
        
        return $result;
    }
    
    public function restore(bool $recursive = true): bool {
        if (!$this->isDeleted()) {
            return true;
        }
        
        if (empty($this->guid) || !$this->canEdit()) {
            return false;
        }
        
        return _elgg_services()->events->triggerSequence('restore', $this->type, $this, function () use ($recursive) {
            return elgg_call(ELGG_IGNORE_ACCESS | ELGG_SHOW_DISABLED_ENTITIES | ELGG_SHOW_DELETED_ENTITIES, function() use ($recursive) {
                if (!_elgg_services()->entityTable->restore($this)) {
                    return false;
                }
                
                $this->attributes['deleted'] = 'no';
                $this->attributes['time_deleted'] = 0;
                
                $this->removeAllRelationships('deleted_by');
                $this->removeAllRelationships('deleted_with');
                
                if (!$recursive) {
                    return true;
                }
                
                set_time_limit(0);
                
                /* @var $deleted_with_it \ElggBatch */
                $deleted_with_it = elgg_get_entities([
                    'relationship' => 'deleted_with',
                    'relationship_guid' => $this->guid,
                    'inverse_relationship' => true,
                    'limit' => false,
                    'batch' => true,
                    'batch_inc_offset' => false,
                ]);
                
                /* @var $e \ElggEntity */
                foreach ($deleted_with_it as $e) {
                    if (!$e->restore($recursive)) {
                        $deleted_with_it->reportFailure();
                        continue;
                    }
                }
                
                return true;
            });
        });
    }
    
    public function isDeleted(): bool {
        return $this->deleted === 'yes';
    }
    
    public function toObject(array $params = []) {
        $object = $this->prepareObject(new \Elgg\Export\Entity());
 
        $params['entity'] = $this;
 
        return _elgg_services()->events->triggerResults('to:object', 'entity', $params, $object);
    }
 
    protected function prepareObject(\Elgg\Export\Entity $object) {
        $object->guid = $this->guid;
        $object->type = $this->getType();
        $object->subtype = $this->getSubtype();
        $object->owner_guid = $this->getOwnerGUID();
        $object->container_guid = $this->getContainerGUID();
        $object->time_created = date('c', $this->getTimeCreated());
        $object->time_updated = date('c', $this->getTimeUpdated());
        $object->url = $this->getURL();
        $object->read_access = (int) $this->access_id;
        return $object;
    }
 
    public function setLatLong(float $lat, float $long): void {
        $this->{'geo:lat'} = $lat;
        $this->{'geo:long'} = $long;
    }
 
    public function getLatitude(): float {
        return (float) $this->{'geo:lat'};
    }
 
    public function getLongitude(): float {
        return (float) $this->{'geo:long'};
    }
 
    /*
     * SYSTEM LOG INTERFACE
     */
 
    public function getSystemLogID(): int {
        return (int) $this->getGUID();
    }
 
    public function getObjectFromID(int $id): ?\ElggEntity {
        return get_entity($id);
    }
 
    public function updateLastAction(?int $posted = null): int {
        $posted = _elgg_services()->entityTable->updateLastAction($this, $posted);
        
        $this->attributes['last_action'] = $posted;
        $this->cache();
        
        return $posted;
    }
 
    public function updateTimeDeleted(?int $deleted = null): int {
        $deleted = _elgg_services()->entityTable->updateTimeDeleted($this, $deleted);
        
        $this->attributes['time_deleted'] = $deleted;
        $this->cache();
        
        return $deleted;
    }
 
    public function disableCaching(): void {
        $this->_is_cacheable = false;
        if ($this->guid) {
            _elgg_services()->entityCache->delete($this->guid);
        }
    }
 
    public function enableCaching(): void {
        $this->_is_cacheable = true;
    }
 
    public function isCacheable(): bool {
        if (!$this->guid) {
            return false;
        }
        
        if (_elgg_services()->session_manager->getIgnoreAccess()) {
            return false;
        }
        
        return $this->_is_cacheable;
    }
 
    public function cache(): void {
        if (!$this->isCacheable()) {
            return;
        }
 
        _elgg_services()->entityCache->save($this->guid, $this);
    }
 
    public function invalidateCache(): void {
        if (!$this->guid) {
            return;
        }
 
        _elgg_services()->entityCache->delete($this->guid);
        _elgg_services()->metadataCache->delete($this->guid);
    }
    
    public function hasCapability(string $capability): bool {
        return _elgg_services()->entity_capabilities->hasCapability($this->getType(), $this->getSubtype(), $capability);
    }
    
    public static function getDefaultFields(): array {
        return [];
    }
    
    final public function getFields(): array {
        return _elgg_services()->fields->get($this->getType(), $this->getSubtype());
    }
}