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/gecko_api/include/nsParserDataListener.h

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 1/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 2/* ***** BEGIN LICENSE BLOCK *****
 3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 4 *
 5 * The contents of this file are subject to the Mozilla Public License Version
 6 * 1.1 (the "License"); you may not use this file except in compliance with
 7 * the License. You may obtain a copy of the License at
 8 * http://www.mozilla.org/MPL/
 9 *
10 * Software distributed under the License is distributed on an "AS IS" basis,
11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 * for the specific language governing rights and limitations under the
13 * License.
14 *
15 * The Original Code is mozilla.org code.
16 *
17 * The Initial Developer of the Original Code is mozilla.org.
18 * Portions created by the Initial Developer are Copyright (C) 2004
19 * the Initial Developer. All Rights Reserved.
20 *
21 * Contributor(s):
22 *   Johnny Stenback <jst@mozilla.org>
23 *
24 * Alternatively, the contents of this file may be used under the terms of
25 * either the GNU General Public License Version 2 or later (the "GPL"), or
26 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 * in which case the provisions of the GPL or the LGPL are applicable instead
28 * of those above. If you wish to allow use of your version of this file only
29 * under the terms of either the GPL or the LGPL, and not to allow others to
30 * use your version of this file under the terms of the MPL, indicate your
31 * decision by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL or the LGPL. If you do not delete
33 * the provisions above, a recipient may use your version of this file under
34 * the terms of any one of the MPL, the GPL or the LGPL.
35 *
36 * ***** END LICENSE BLOCK ***** */
37
38#ifndef __nsParserDataListener_h__
39#define __nsParserDataListener_h__
40
41/*
42 * Include this header if you're implementing a parser data
43 * listener. To make a component a parser data listener you'll need to
44 * make your component implement the interface
45 * nsIUnicharStreamListener. That interface has three methods (one +
46 * two inherited ones, not counting what's defined in
47 * nsISupports). The methods are:
48 *
49 *  void onStartRequest(in nsIRequest aRequest,
50 *                      in nsISupports aContext);
51 *  void onUnicharDataAvailable(in nsIRequest aRequest,
52 *                              in nsISupports aContext, in AString aData);
53 *  void onStopRequest(in nsIRequest aRequest,
54 *                     in nsISupports aContext,
55 *                     in nsresult aStatusCode);
56 *
57 * All those methods are called for every network request that ends up
58 * feeding data to the parser. The method are called in the order
59 * shown above, first one call to onStartRequest(), then one call to
60 * onUnicharDataAvailable() per chunk of data received and converted
61 * to UTF-16, and finally one call to onStopRequest().
62 *
63 * The nsIRequest passed into these methods will be the same object
64 * for all these calls for a given network request. If the request
65 * pointer is used to uniquely identify an ongoing request, the
66 * pointer should be QueryInterface()'d to nsISupports to ensure that
67 * the pointer used is the identity pointer to the object.
68 *
69 * The context argument passed to these methods will be the document
70 * (nsIDOMDocument) parsed from the stream, or null when not
71 * available.
72 *
73 * Any errors returned from any of these calls will end up canceling
74 * the stream, and the data that is passed to the call in question
75 * will *not* be seen by the parser. So unless you intend to interrupt
76 * a request, *make sure* that you return NS_OK from these methods!
77 */
78
79#include "nsIUnicharStreamListener.h"
80
81/*
82 * To register a component to be a parser data listener the
83 * component's contract id should be registered with the category
84 * manager (nsICategoryManager), with the category
85 * PARSER_DATA_LISTENER_CATEGORY, defined here.
86 *
87 * @status FROZEN
88 */
89#define PARSER_DATA_LISTENER_CATEGORY "Parser data listener"
90
91#endif // __nsParserDataListener_h__