mikekamornikov / UpgradeSpec

     *

     * @param mixed $elements

     */

    public function addElements($elements)

    {

        if (!is_array($elements) && !$elements instanceof \Traversable) {

            throw new \InvalidArgumentException(sprintf('Argument is not traversable: %s', $elements));

        }

        $elements = is_array($elements) ? $elements : iterator_to_array($elements);

        foreach ($elements as $element) {

            if (!is_a($element, ElementInterface::class)) {

                throw new \InvalidArgumentException('Provider expects ElementInterface[]');

            }

        }

        $this->specElements = array_merge($this->specElements, $elements);

    }

    /**

     * @param Upgrade $context

     *

     * @param mixed $providers

     */

    public function addProviders($providers)

    {

        if (!is_array($providers) && !$providers instanceof \Traversable) {

            throw new \InvalidArgumentException(sprintf('Argument is not traversable: %s', $providers));

        }

        $providers = is_array($providers) ? $providers : iterator_to_array($providers);

        foreach ($providers as $provider) {

            if (!is_a($provider, ProviderInterface::class)) {

                throw new \InvalidArgumentException('ProviderChain expects ProviderInterface[]');

            }

        }

        $this->providers = array_merge($this->providers, $providers);

    }

}