KeyCollection.php

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<?php

namespace SAML2\Certificate;

use SAML2\Exception\InvalidArgumentException;
use SAML2\Utilities\ArrayCollection;

class KeyCollection extends ArrayCollection
{
    public function add($key)
    {
        if (!$key instanceof Key) {
            throw InvalidArgumentException::invalidType(
                'SAML2\Certificate\Key',
                $key
            );
        }

        parent::add($key);
    }
}