/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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
 * http://www.mozilla.org/MPL/
 *
 * 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 the Character Set Resolver interface
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corp.
 * Portions created by the Initial Developer are Copyright (C) 2003
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Alec Flett <alecf@flett.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * 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
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIDocShell;
interface nsIChannel;

[scriptable, uuid(d143a084-b626-4614-845f-41f3ca43a674)]
interface nsICharsetResolver : nsISupports
{
    /**
     * requestCharset
     * called to resolve the charset of an existing docshell.
     * If the charset cannot be resolved, but the implementation is
     * still curious what the final charset turned out to be, it can
     * set wantCharset to true.
     * If so, notifyResovedCharset will be called with the resulting
     * closure
     * 
     * @param docShell    the docshell the document is being loaded in
     * @param channel     the channel the document is coming in from
     * @param charsetSource a unique number which can be stored by the
     *                    caller to remember which resolver actually
     *                    resolved the charset.
     * @param wantCharset gets set to true if notifyResolvedCharset should be
     *                    called with the given closure object
     * @param closure     a resulting object which should be passed
     *                    to notifyResolvedCharset
     * @returns           the resolved charset, or the empty string if no
     *                    charset could be determined
     */
    ACString requestCharset(in nsIDocShell docShell, in nsIChannel channel,
                            out long charsetSource,
                            out boolean wantCharset,
                            out nsISupports closure);

    /**
     * notifyResolvedCharset
     *
     * some implementations may request that they be notified when the
     * charset is actually detected. 
     *
     * @param charset the detected charset
     * @param closure the closre returned by detectCharset() above
     */
    void notifyResolvedCharset(in ACString charset, in nsISupports closure);
};