content_lock-8.x-2.1/src/Plugin/views/filter/ContentLockFilter.php

<?php

namespace Drupal\content_lock\Plugin\views\filter;

use Drupal\views\Attribute\ViewsFilter;
use Drupal\views\Plugin\views\filter\BooleanOperator;

/**
 * Filter handler for content lock.
 *
 * @group views_filter_handlers
 *
 * @ViewsFilter("content_lock_filter")
 */
#[ViewsFilter('content_lock_filter')]
class ContentLockFilter extends BooleanOperator {

  /**
   * {@inheritdoc}
   */
  public function query(): void {
    $this->ensureMyTable();
    if (empty($this->value)) {
      $this->query->addWhere($this->options['group'], $this->tableAlias . ".timestamp", 0, static::EQUAL);
    }
    else {
      $this->query->addWhere($this->options['group'], $this->tableAlias . ".timestamp", 0, static::NOT_EQUAL);
    }
  }

}