favicon_source.h revision ddb351dbec246cf1fab5ec20d2d5520909041de1 
1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_UI_WEBUI_FAVICON_SOURCE_H_
6#define CHROME_BROWSER_UI_WEBUI_FAVICON_SOURCE_H_
7#pragma once
8
9#include <string>
10
11#include "base/basictypes.h"
12#include "base/memory/ref_counted.h"
13#include "chrome/browser/favicon_service.h"
14#include "chrome/browser/ui/webui/chrome_url_data_manager.h"
15
16class GURL;
17class Profile;
18
19// FaviconSource is the gateway between network-level chrome:
20// requests for favicons and the history backend that serves these.
21class FaviconSource : public ChromeURLDataManager::DataSource {
22 public:
23  explicit FaviconSource(Profile* profile);
24
25  // Called when the network layer has requested a resource underneath
26  // the path we registered.
27  virtual void StartDataRequest(const std::string& path,
28                                bool is_incognito,
29                                int request_id);
30
31  virtual std::string GetMimeType(const std::string&) const;
32
33  virtual bool ShouldReplaceExistingSource() const;
34
35 private:
36  // Called when favicon data is available from the history backend.
37  void OnFaviconDataAvailable(FaviconService::Handle request_handle,
38                              history::FaviconData favicon);
39
40  // Sends the default favicon.
41  void SendDefaultResponse(int request_id);
42
43  virtual ~FaviconSource();
44
45  Profile* profile_;
46  CancelableRequestConsumerT<int, 0> cancelable_consumer_;
47
48  // Raw PNG representation of the favicon to show when the favicon
49  // database doesn't have a favicon for a webpage.
50  scoped_refptr<RefCountedMemory> default_favicon_;
51
52  DISALLOW_COPY_AND_ASSIGN(FaviconSource);
53};
54
55#endif  // CHROME_BROWSER_UI_WEBUI_FAVICON_SOURCE_H_
56