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Edit File: Priority.php

<?php

namespace AmeliaBooking\Domain\ValueObjects;

use AmeliaBooking\Domain\Common\Exceptions\InvalidArgumentException;

/**
 * Class Priority
 *
 * @package AmeliaBooking\Domain\ValueObjects
 */
final class Priority
{
    public const LEAST_EXPENSIVE = 'least_expensive';
    public const MOST_EXPENSIVE  = 'most_expensive';
    public const LEAST_OCCUPIED  = 'least_occupied';
    public const MOST_OCCUPIED   = 'most_occupied';

/**
     * @var int
     */
    private $value;

/**
     * @param string $value
     *
     * @throws InvalidArgumentException
     */
    public function __construct($value)
    {
        if (
            !in_array(
                $value,
                [
                self::LEAST_EXPENSIVE,
                self::MOST_EXPENSIVE,
                self::LEAST_OCCUPIED,
                self::MOST_OCCUPIED
                ],
                false
            )
        ) {
            throw new InvalidArgumentException('Not valid priority option');
        }
        $this->value = $value;
    }

/**
     * Return the value from the value object
     *
     * @return string
     */
    public function getValue()
    {
        return $this->value;
    }
}

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