/**
  * 
  * @return \webignition\WebResource\Sitemap\Sitemap
  */
 protected function createSitemap()
 {
     $configuration = new SitemapConfiguration();
     $configuration->setTypeToUrlExtractorClassMap(array('sitemaps.org.xml' => 'webignition\\WebResource\\Sitemap\\UrlExtractor\\SitemapsOrgXmlUrlExtractor', 'sitemaps.org.txt' => 'webignition\\WebResource\\Sitemap\\UrlExtractor\\SitemapsOrgTxtUrlExtractor', 'application/atom+xml' => 'webignition\\WebResource\\Sitemap\\UrlExtractor\\NewsFeedUrlExtractor', 'application/rss+xml' => 'webignition\\WebResource\\Sitemap\\UrlExtractor\\NewsFeedUrlExtractor', 'sitemaps.org.xml.index' => 'webignition\\WebResource\\Sitemap\\UrlExtractor\\SitemapsOrgXmlIndexUrlExtractor'));
     $sitemap = new Sitemap();
     $sitemap->setConfiguration($configuration);
     return $sitemap;
 }
 /**
  * 
  * @return array
  */
 public function getUrls()
 {
     if (is_null($this->urls)) {
         $this->urls = array();
         $extractorClass = $this->configuration->getExtractorClassForType($this->getType());
         if (is_null($extractorClass)) {
             return array();
         }
         $extractor = new $extractorClass();
         $urls = $extractor->extract($this->getContent());
         foreach ($urls as $url) {
             $normalisedUrl = (string) new NormalisedUrl($url);
             if (!array_key_exists($normalisedUrl, $this->urls)) {
                 $this->urls[$normalisedUrl] = true;
             }
         }
     }
     return array_keys($this->urls);
 }