}


    @Override
    public boolean isDisconnected () {
        Socket s = this.socket;
        return super.isDisconnected() || s == null || s.isClosed();
    }


    @Override
    public boolean isFailed () {
        Socket s = this.socket;
        return super.isFailed() || s == null || s.isClosed();
    }


    @Override

     * @return {@link ConcurrentSkipListMap}の新しいインスタンス
     * @see ConcurrentSkipListMap#ConcurrentSkipListMap(Comparator)
     */
    public static <K, V> ConcurrentSkipListMap<K, V> newConcurrentSkipListMap(final Comparator<? super K> c) {
        return new ConcurrentSkipListMap<>(c);
    }

    /**
     * {@link ConcurrentSkipListMap}の新しいインスタンスを作成して返します。
     *
     * @param <K>
     *            {@link ConcurrentSkipListMap}のキーの型

     * 
     * @param url
     * @param tc
     *            context to use
     * @throws MalformedURLException
     */
    public SmbFile ( URL url, CIFSContext tc ) throws MalformedURLException {
        super(url);
        if ( url.getPath() != null && !url.getPath().isEmpty() && url.getPath().charAt(0) != '/' ) {
            throw new MalformedURLException("Invalid SMB URL: " + url);
        }
        this.transportContext = tc;