<?php

declare(strict_types=1);

namespace GuzzleHttp\Promise;

final class State
{
    private function __construct()
    {
    }

    /**
     * Returns true if a promise is pending.
     */
    public static function isPending(PromiseInterface $promise): bool
    {
        return $promise->getState() === PromiseInterface::PENDING;
    }

    /**
     * Returns true if a promise is fulfilled or rejected.
     */
    public static function isSettled(PromiseInterface $promise): bool
    {
        return $promise->getState() !== PromiseInterface::PENDING;
    }

    /**
     * Returns true if a promise is fulfilled.
     */
    public static function isFulfilled(PromiseInterface $promise): bool
    {
        return $promise->getState() === PromiseInterface::FULFILLED;
    }

    /**
     * Returns true if a promise is rejected.
     */
    public static function isRejected(PromiseInterface $promise): bool
    {
        return $promise->getState() === PromiseInterface::REJECTED;
    }
}