CountConstraint.php

<?php

namespace Drupal\Core\Validation\Plugin\Validation\Constraint;

use Symfony\Component\Validator\Constraints\Count;

/**
 * Count constraint.
 *
 * Overrides the symfony constraint to use Drupal-style replacement patterns.
 *
 * @Constraint(
 *   id = "Count",
 *   label = @Translation("Count", context = "Validation"),
 *   type = { "list" }
 * )
 */
class CountConstraint extends Count {
    public $minMessage = 'This collection should contain %limit element or more.|This collection should contain %limit elements or more.';
    public $maxMessage = 'This collection should contain %limit element or less.|This collection should contain %limit elements or less.';
    public $exactMessage = 'This collection should contain exactly %limit element.|This collection should contain exactly %limit elements.';
    
    /**
     * {@inheritdoc}
     */
    public function validatedBy() {
        return '\\Symfony\\Component\\Validator\\Constraints\\CountValidator';
    }

}