class ArgumentValidatorTest

class ArgumentValidatorTest extends ArgumentValidatorPluginBase {
  
  /**
   * {@inheritdoc}
   */
  public function calculateDependencies() {
    return [
      'content' => [
        'ArgumentValidatorTest',
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['test_value'] = [
      'default' => '',
    ];
    return $options;
  }
  
  /**
   * {@inheritdoc}
   */
  public function validateArgument($arg) {
    if ($arg === 'this value should be replaced') {
      // Set the argument to a numeric value so this is valid on PostgreSQL for
      // numeric fields.
      $this->argument->argument = '1';
      return TRUE;
    }
    return $arg == $this->options['test_value'];
  }

}