NetipProvider for Geocoder library

gistfile1.php

<?php

namespace My\Bundle\Utils\Geo;

use Geocoder\Exception\NoResultException;
use Geocoder\Exception\UnsupportedException;
use Geocoder\Provider\AbstractProvider;
use Geocoder\Provider\ProviderInterface;

class NetipProvider extends AbstractProvider implements ProviderInterface
{
    /**
     * @var string
     */
    const NETIP_ENDPOINT_URL = 'http://www.netip.de/search?query=%s';

    /**
     * {@inheritDoc}
     */
    public function getGeocodedData($address)
    {
        if (!filter_var($address, FILTER_VALIDATE_IP)) {
            throw new UnsupportedException('The Netip does not support street addresses.');
        }

        if (in_array($address, array('127.0.0.1', '::1'))) {
            return array($this->getLocalhostDefaults());
        }

        $query = sprintf(self::NETIP_ENDPOINT_URL, $address);

        return $this->executeQuery($query);
    }

    /**
     * {@inheritDoc}
     */
    public function getReversedData(array $coordinates)
    {
        throw new UnsupportedException('The NetipProvider is not able to do reverse geocoding.');
    }

    /**
     * {@inheritDoc}
     */
    public function getName()
    {
        return 'netip';
    }


    protected function executeQuery($query)
    {
        $content = $this->getAdapter()->getContent($query);

        if (null === $content || '' === $content) {
            throw new NoResultException(sprintf('Could not execute query %s', $query));
        }

        $patterns['country'] = '#Country: (.*?)&nbsp;#i';
        $patterns['city'] = '#City: (.*?)<br#i';
        $patterns['latitude'] = '#var latitude = (.*?);#i';
        $patterns['longitude'] = '#var longitude = (.*?);#i';

        $data = array();

        foreach ($patterns as $key => $pattern) {
            $data[$key] = preg_match($pattern, $content, $value) && !empty($value[1]) ? $value[1] : 'false';
        }

        $data = array_filter($data);

        if (empty($data) || !isset($data['latitude']) || !isset($data['longitude'])) {
            throw new NoResultException(sprintf('Could not find data for query %s', $query));
        }

        return array(array_merge($this->getDefaults(), $data));
    }
}