<?php

namespace PSX\Uri;

use InvalidArgumentException;

/**
 * Represents a URN. This class exists mostly to express in your code that
 * you expect/return a URN. Also the value must have "urn" as scheme else an
 * exception is thrown
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 * @see     http://www.ietf.org/rfc/rfc2141.txt
 */
class Urn extends Uri
{
    protected $nid;
    protected $nss;

    /**
     * Returns the NID (Namespace Identifier)
     *
     * @return string
     */
    public function getNid()
    {
        return $this->nid;
    }

    /**
     * Returns the NSS (Namespace Specific String)
     *
     * @return string
     */
    public function getNss()
    {
        return $this->nss;
    }

    protected function parse($urn)
    {
        // URNs are case insensitive
        $urn = strtolower(rawurldecode((string) $urn));

        parent::parse($urn);

        // must have an urn scheme and path part
        if ($this->scheme != 'urn' || empty($this->path)) {
            throw new InvalidArgumentException('Invalid urn syntax');
        }

        // parse
        $this->nid = strstr($this->path, ':', true);
        $this->nss = substr(strstr($this->path, ':'), 1);
    }

    protected function parseAuthority($authority)
    {
    }

    protected function parseParameters($query)
    {
    }
}
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