/**
     * Returns an editor for this snapshot's entry, or null if either the entry has changed since
     * this snapshot was created or if another edit is in progress.
     */
    @Throws(IOException::class)
    fun edit(): Editor? = this@DiskLruCache.edit(key, sequenceNumber)

    /** Returns the unbuffered stream with the value for [index]. */
    fun getSource(index: Int): Source = sources[index]