class Node

class Node extends EditorialContentEntityBase implements NodeInterface {
    use EntityOwnerTrait;
    
    /**
     * Whether the node is being previewed or not.
     *
     * The variable is set to public as it will give a considerable performance
     * improvement. See https://www.drupal.org/node/2498919.
     *
     * @var true|null
     *   TRUE if the node is being previewed and NULL if it is not.
     */
    public $in_preview = NULL;
    
    /**
     * {@inheritdoc}
     */
    public function preSave(EntityStorageInterface $storage) {
        parent::preSave($storage);
        foreach (array_keys($this->getTranslationLanguages()) as $langcode) {
            $translation = $this->getTranslation($langcode);
            // If no owner has been set explicitly, make the anonymous user the owner.
            if (!$translation->getOwner()) {
                $translation->setOwnerId(0);
            }
        }
        // If no revision author has been set explicitly, make the node owner the
        // revision author.
        if (!$this->getRevisionUser()) {
            $this->setRevisionUserId($this->getOwnerId());
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function preSaveRevision(EntityStorageInterface $storage, \stdClass $record) {
        parent::preSaveRevision($storage, $record);
        if (!$this->isNewRevision() && isset($this->original) && (!isset($record->revision_log) || $record->revision_log === '')) {
            // If we are updating an existing node without adding a new revision, we
            // need to make sure $entity->revision_log is reset whenever it is empty.
            // Therefore, this code allows us to avoid clobbering an existing log
            // entry with an empty one.
            $record->revision_log = $this->original->revision_log->value;
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function postSave(EntityStorageInterface $storage, $update = TRUE) {
        parent::postSave($storage, $update);
        // Update the node access table for this node, but only if it is the
        // default revision. There's no need to delete existing records if the node
        // is new.
        if ($this->isDefaultRevision()) {
            
            /** @var \Drupal\node\NodeAccessControlHandlerInterface $access_control_handler */
            $access_control_handler = \Drupal::entityTypeManager()->getAccessControlHandler('node');
            $grants = $access_control_handler->acquireGrants($this);
            \Drupal::service('node.grant_storage')->write($this, $grants, NULL, $update);
        }
        // Reindex the node when it is updated. The node is automatically indexed
        // when it is added, simply by being added to the node table.
        if ($update) {
            node_reindex_node_search($this->id());
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function preDelete(EntityStorageInterface $storage, array $entities) {
        parent::preDelete($storage, $entities);
        // Ensure that all nodes deleted are removed from the search index.
        if (\Drupal::hasService('search.index')) {
            
            /** @var \Drupal\search\SearchIndexInterface $search_index */
            $search_index = \Drupal::service('search.index');
            foreach ($entities as $entity) {
                $search_index->clear('node_search', $entity->nid->value);
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function postDelete(EntityStorageInterface $storage, array $nodes) {
        parent::postDelete($storage, $nodes);
        \Drupal::service('node.grant_storage')->deleteNodeRecords(array_keys($nodes));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getType() {
        return $this->bundle();
    }
    
    /**
     * {@inheritdoc}
     */
    public function access($operation = 'view', AccountInterface $account = NULL, $return_as_object = FALSE) {
        // This override exists to set the operation to the default value "view".
        return parent::access($operation, $account, $return_as_object);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTitle() {
        return $this->get('title')->value;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setTitle($title) {
        $this->set('title', $title);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCreatedTime() {
        return $this->get('created')->value;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setCreatedTime($timestamp) {
        $this->set('created', $timestamp);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isPromoted() {
        return (bool) $this->get('promote')->value;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setPromoted($promoted) {
        $this->set('promote', $promoted ? NodeInterface::PROMOTED : NodeInterface::NOT_PROMOTED);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isSticky() {
        return (bool) $this->get('sticky')->value;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setSticky($sticky) {
        $this->set('sticky', $sticky ? NodeInterface::STICKY : NodeInterface::NOT_STICKY);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
        $fields = parent::baseFieldDefinitions($entity_type);
        $fields += static::ownerBaseFieldDefinitions($entity_type);
        $fields['title'] = BaseFieldDefinition::create('string')->setLabel(t('Title'))
            ->setRequired(TRUE)
            ->setTranslatable(TRUE)
            ->setRevisionable(TRUE)
            ->setSetting('max_length', 255)
            ->setDisplayOptions('view', [
            'label' => 'hidden',
            'type' => 'string',
            'weight' => -5,
        ])
            ->setDisplayOptions('form', [
            'type' => 'string_textfield',
            'weight' => -5,
        ])
            ->setDisplayConfigurable('form', TRUE);
        $fields['uid']->setLabel(t('Authored by'))
            ->setDescription(t('The username of the content author.'))
            ->setRevisionable(TRUE)
            ->setDisplayOptions('view', [
            'label' => 'hidden',
            'type' => 'author',
            'weight' => 0,
        ])
            ->setDisplayOptions('form', [
            'type' => 'entity_reference_autocomplete',
            'weight' => 5,
            'settings' => [
                'match_operator' => 'CONTAINS',
                'size' => '60',
                'placeholder' => '',
            ],
        ])
            ->setDisplayConfigurable('form', TRUE);
        $fields['status']->setDisplayOptions('form', [
            'type' => 'boolean_checkbox',
            'settings' => [
                'display_label' => TRUE,
            ],
            'weight' => 120,
        ])
            ->setDisplayConfigurable('form', TRUE);
        $fields['created'] = BaseFieldDefinition::create('created')->setLabel(t('Authored on'))
            ->setDescription(t('The time that the node was created.'))
            ->setRevisionable(TRUE)
            ->setTranslatable(TRUE)
            ->setDisplayOptions('view', [
            'label' => 'hidden',
            'type' => 'timestamp',
            'weight' => 0,
        ])
            ->setDisplayOptions('form', [
            'type' => 'datetime_timestamp',
            'weight' => 10,
        ])
            ->setDisplayConfigurable('form', TRUE);
        $fields['changed'] = BaseFieldDefinition::create('changed')->setLabel(t('Changed'))
            ->setDescription(t('The time that the node was last edited.'))
            ->setRevisionable(TRUE)
            ->setTranslatable(TRUE);
        $fields['promote'] = BaseFieldDefinition::create('boolean')->setLabel(t('Promoted to front page'))
            ->setRevisionable(TRUE)
            ->setTranslatable(TRUE)
            ->setDefaultValue(TRUE)
            ->setDisplayOptions('form', [
            'type' => 'boolean_checkbox',
            'settings' => [
                'display_label' => TRUE,
            ],
            'weight' => 15,
        ])
            ->setDisplayConfigurable('form', TRUE);
        $fields['sticky'] = BaseFieldDefinition::create('boolean')->setLabel(t('Sticky at top of lists'))
            ->setRevisionable(TRUE)
            ->setTranslatable(TRUE)
            ->setDefaultValue(FALSE)
            ->setDisplayOptions('form', [
            'type' => 'boolean_checkbox',
            'settings' => [
                'display_label' => TRUE,
            ],
            'weight' => 16,
        ])
            ->setDisplayConfigurable('form', TRUE);
        return $fields;
    }

}