gecko-dev/xpcom/io/nsIMultiplexInputStream.idl

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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is frightening to behold.
 *
 * The Initial Developer of the Original Code is
 * Jonas Sicking.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Jonas Sicking <sicking@bigfoot.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsIInputStream.idl"

/**
 * The multiplex stream concatinates 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);
};