private boolean isValidWikiPageName(String linkName, WikiPageProperty symLinks) throws Exception {
   if (page.hasChildPage(linkName) && !symLinks.has(linkName)) {
     response =
         new ErrorResponder(resource + " already has a child named " + linkName + ".")
             .makeResponse(context, null);
     response.setStatus(412);
     return false;
   } else if (!PathParser.isSingleWikiWord(linkName)) {
     response =
         new ErrorResponder(linkName + " is not a valid WikiWord.").makeResponse(context, null);
     response.setStatus(412);
     return false;
   }
   return true;
 }
 private boolean fileIsValid(final File path) {
   return fileSystem.isDirectory(path) && PathParser.isSingleWikiWord(path.getName());
 }