CountConstraint.php

<?php

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

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Symfony\Component\Validator\Constraints\Count;

/**
 * Count constraint.
 *
 * Overrides the symfony constraint to use Drupal-style replacement patterns.
 */
class CountConstraint extends Count {
    
    /**
     * {@inheritdoc}
     */
    public function __construct(...$args) {
        $this->minMessage = 'This collection should contain %limit element or more.|This collection should contain %limit elements or more.';
        $this->maxMessage = 'This collection should contain %limit element or less.|This collection should contain %limit elements or less.';
        $this->exactMessage = 'This collection should contain exactly %limit element.|This collection should contain exactly %limit elements.';
        parent::__construct(...$args);
    }
    
    /**
     * {@inheritdoc}
     *
     * @return string
     *   The name of the class that validates this constraint.
     *
     * @todo Add method return type declaration.
     * @see https://www.drupal.org/project/drupal/issues/3425150
     */
    public function validatedBy() {
        return '\\Symfony\\Component\\Validator\\Constraints\\CountValidator';
    }

}