Get saved OkHttp cache

GetOkHttpCache.java

    /**
     * Returns response cached by OkHttp.
     *
     * @param url URL used to make original request
     */
    @Nullable
    private List<PostModel> getCachedDataIfExist(final String url) {
        // OkHttpClient saves cache using DiskLruCache, the cached data is stored in the cache dir in the files
        // which names are created by md5 hash function, e.g. for
        // http://www.yourserver.com/posts?filter[posts_per_page]=10&page=1
        // the file name is 0fcd35e5c6a73ab6eb01295765ffd8e7.1
        // we can use it to retrieve the previously cached data if the data exist
        String urlKey = Util.md5Hex(url);
        // read file
        File cacheDir = new File(getActivity().getCacheDir(), getActivity().getString(R.string.http_cache_dir_name));
        try {
            // cache entry metadata is saved in a file with an extension .0, uncomment the following line if required
            //String entryMetadata = Utils.readFile(new File(cacheDir, urlKey + ".0"));
            // cached data is stored in the file with extension .1
            String entryBody = IoUtils.readFile(new File(cacheDir, urlKey + ".1"));
            if (!TextUtils.isEmpty(entryBody)) {
                final PostModel[] postModels = mGson.fromJson(entryBody, PostModel[].class);
                return  Arrays.asList(postModels);
                
                // Or if just a single object received, uncomment this
                //return mGson.fromJson(entryBody, PostModel.class);
            }
        } catch (IOException e) {
            Timber.w("Cannot read cache file:%s.1", urlKey);
        }
        return null;
    }