public File getTempCacheFile(String url) {
        File cacheDir = config.cacheRoot;
        String fileName = config.fileNameGenerator.generate(url) + ".download";
        return new File(cacheDir, fileName);
    }
Checks is cache contains fully cached file for particular url.

@param url an url cache file will be checked for.
@return {@code true} if cache contains fully cached file for passed in parameters url.
dkplayer-videocache/src/main/java/com/danikula/videocache/HttpProxyCacheServer.java