return this.transportContext;
    }


    /**
     * {@inheritDoc}
     *
     * @see jcifs.util.transport.Transport#acquire()
     */
    @Override
    public SmbTransportImpl acquire () {
        return (SmbTransportImpl) super.acquire();
    }


    /**
     * @return the server's encryption key
     */
    @Override
    public byte[] getServerEncryptionKey () {

        throw new ClassCastException();
    }


    /**
     * @return session increased usage count
     */
    public SmbSessionImpl acquire () {
        long usage = this.usageCount.incrementAndGet();
        if ( log.isTraceEnabled() ) {
            log.trace("Acquire session " + usage + " " + this);
        }

        if ( usage == 1 ) {
            synchronized ( this ) {

                // one extra share to keep the tree alive
                return this.treeHandle.acquire();
            }
            return this.treeHandle;
        }
        return this.treeHandle.acquire();
    }


    /**
     * @param context
     * @param name
     */
    private void setContext ( SmbResource context, String name ) {