gecko-dev/xpcom/io/nsIMultiplexInputStream.idl

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsIInputStream.idl"

/**
 * The multiplex stream concatenates a list of input streams into a single
 * stream.
 */

[scriptable, uuid(a076fd12-1dd1-11b2-b19a-d53b5dffaade)]
interface nsIMultiplexInputStream : nsIInputStream
{
    /**
     * Number of streams in this multiplex-stream
     */
    readonly attribute unsigned long count;

    /**
     * Appends a stream to the end of the streams. The cursor of the stream
     * should be located at the beginning of the stream if the implementation
     * of this nsIMultiplexInputStream also is used as an nsISeekableStream.
     * @param stream  stream to append
     */
    void appendStream(in nsIInputStream stream);

    /**
     * Insert a stream at specified index.  If the cursor of this stream is at
     * the beginning of the stream at index, the cursor will be placed at the
     * beginning of the inserted stream instead.
     * The cursor of the new stream should be located at the beginning of the
     * stream if the implementation of this nsIMultiplexInputStream also is
     * used as an nsISeekableStream.
     * @param stream  stream to insert
     * @param index   index to insert stream at, must be <= count
     */
    void insertStream(in nsIInputStream stream, in unsigned long index);

    /**
     * Remove stream at specified index. If this stream is the one currently
     * being read the readcursor is moved to the beginning of the next
     * stream
     * @param index   remove stream at this index, must be < count
     */
    void removeStream(in unsigned long index);

    /**
     * Get stream at specified index.
     * @param index   return stream at this index, must be < count
     * @return        stream at specified index
     */
    nsIInputStream getStream(in unsigned long index);
};