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public class SitemapRedirectFilterProviderServiceImpl extends SimpleServiceComponent implements SEOGoogleSitemapFilterProvider {
   // Logger for this class
   private static final Logger LOG = Logger.getLogger(SitemapRedirectFilterProviderServiceImpl.class.getName());

   @Override
   public boolean includeInGoogleSitemap(Website website, ContentItemVersion<?> contentItemVersion) {
      if(contentItemVersion instanceof ModularMediaItemVersion) {
         ModularTemplateInstance modularTemplateInstance = ((ModularMediaItemVersion) contentItemVersion).getModularTemplateInstance();
         if(modularTemplateInstance != null) {
            TemplateProperty redirectProperty = modularTemplateInstance.getPropertyByIdentifier("redirect_url");
            if(redirectProperty != null) {
               String redirect = redirectProperty.getStringValue();
               return StringUtils.isEmpty(redirect);
               }
            }
         }

         return true;
   } 
}