class ViewsSearchQuery

class ViewsSearchQuery extends SearchQuery {

  /**
   * Returns the conditions property.
   *
   * @return array
   */
  public function &conditions() {
    return $this->conditions;
  }

  /**
   * Returns the words property.
   *
   * @return array
   */
  public function words() {
    return $this->words;
  }

  /**
   * Returns the simple property.
   *
   * @return bool
   */
  public function simple() {
    return $this->simple;
  }

  /**
   * Returns the matches property.
   *
   * @return int
   */
  public function matches() {
    return $this->matches;
  }

  /**
   * Executes and returns the protected parseSearchExpression method.
   */
  public function publicParseSearchExpression() {
    return $this
      ->parseSearchExpression();
  }

  /**
   * Replaces the original condition with a custom one from views recursively.
   *
   * @param string $search
   *   The searched value.
   * @param string $replace
   *   The value which replaces the search value.
   * @param Drupal\Core\Database\Query\Condition $condition
   *   The query condition in which the string is replaced.
   */
  function condition_replace_string($search, $replace, &$condition) {
    if ($condition['field'] instanceof Condition) {
      $conditions =& $condition['field']
        ->conditions();
      foreach ($conditions as $key => &$subcondition) {
        if (is_numeric($key)) {

          // As conditions can have subconditions, for example db_or(), the
          // function has to be called recursively.
          $this
            ->condition_replace_string($search, $replace, $subcondition);
        }
      }
    }
    else {
      $condition['field'] = str_replace($search, $replace, $condition['field']);
    }
  }

}