class UserPictureFile

class UserPictureFile extends DrupalSqlBase {
    
    /**
     * The file directory path.
     *
     * @var string
     */
    protected $filePath;
    
    /**
     * The temporary file path.
     *
     * @var string
     */
    protected $tempFilePath;
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $query = $this->select('users', 'u')
            ->condition('u.picture', '', '<>')
            ->fields('u', [
            'uid',
            'picture',
        ]);
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function initializeIterator() {
        $site_path = $this->configuration['site_path'] ?? 'sites/default';
        $this->filePath = $this->variableGet('file_directory_path', $site_path . '/files') . '/';
        $this->tempFilePath = $this->variableGet('file_directory_temp', '/tmp') . '/';
        return parent::initializeIterator();
    }
    
    /**
     * {@inheritdoc}
     */
    public function prepareRow(Row $row) {
        $row->setSourceProperty('filename', basename($row->getSourceProperty('picture')));
        $row->setSourceProperty('file_directory_path', $this->filePath);
        $row->setSourceProperty('temp_directory_path', $this->tempFilePath);
        return parent::prepareRow($row);
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        return [
            'picture' => "Path to the user's uploaded picture.",
            'filename' => 'The picture filename.',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['uid']['type'] = 'integer';
        return $ids;
    }

}