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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_FAVICON_SERVICE_H__
#define CHROME_BROWSER_FAVICON_SERVICE_H__
#include <vector>
#include "base/ref_counted.h"
#include "base/ref_counted_memory.h"
#include "base/task.h"
#include "chrome/browser/cancelable_request.h"
#include "chrome/browser/history/history_types.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/ref_counted_util.h"
class GURL;
class Profile;
// The favicon service provides methods to access favicons. It calls the history
// backend behind the scenes.
//
// This service is thread safe. Each request callback is invoked in the
// thread that made the request.
class FaviconService : public CancelableRequestProvider,
public base::RefCountedThreadSafe<FaviconService> {
public:
explicit FaviconService(Profile* profile);
// Callback for GetFavicon. If we have previously inquired about the favicon
// for this URL, |know_favicon| will be true, and the rest of the fields will
// be valid (otherwise they will be ignored).
//
// On |know_favicon| == true, |data| will either contain the PNG encoded
// favicon data, or it will be NULL to indicate that the site does not have
// a favicon (in other words, we know the site doesn't have a favicon, as
// opposed to not knowing anything). |expired| will be set to true if we
// refreshed the favicon "too long" ago and should be updated if the page
// is visited again.
typedef Callback5<Handle, // handle
bool, // know_favicon
scoped_refptr<RefCountedBytes>, // data
bool, // expired
GURL>::Type // url of the favicon
FaviconDataCallback;
typedef CancelableRequest<FaviconDataCallback> GetFaviconRequest;
// Requests the favicon. |consumer| is notified when the bits have been
// fetched.
Handle GetFavicon(const GURL& icon_url,
CancelableRequestConsumerBase* consumer,
FaviconDataCallback* callback);
// Fetches the favicon at |icon_url|, sending the results to the given
// |callback|. If the favicon has previously been set via SetFavicon(), then
// the favicon URL for |page_url| and all redirects is set to |icon_url|. If
// the favicon has not been set, the database is not updated.
Handle UpdateFaviconMappingAndFetch(const GURL& page_url,
const GURL& icon_url,
CancelableRequestConsumerBase* consumer,
FaviconDataCallback* callback);
// Requests a favicon for a web page URL. |consumer| is notified
// when the bits have been fetched.
//
// Note: this version is intended to be used to retrieve the favicon of a
// page that has been browsed in the past. |expired| in the callback is
// always false.
Handle GetFaviconForURL(const GURL& page_url,
CancelableRequestConsumerBase* consumer,
FaviconDataCallback* callback);
// Marks the favicon for the page as being out of date.
void SetFaviconOutOfDateForPage(const GURL& page_url);
// Allows the importer to set many favicons for many pages at once. The pages
// must exist, any favicon sets for unknown pages will be discarded. Existing
// favicons will not be overwritten.
void SetImportedFavicons(
const std::vector<history::ImportedFavIconUsage>& favicon_usage);
// Sets the favicon for a page.
void SetFavicon(const GURL& page_url,
const GURL& icon_url,
const std::vector<unsigned char>& image_data);
private:
friend class base::RefCountedThreadSafe<FaviconService>;
~FaviconService() {}
Profile* profile_;
// Helper to forward an empty result if we cannot get the history service.
void ForwardEmptyResultAsync(GetFaviconRequest* request);
DISALLOW_COPY_AND_ASSIGN(FaviconService);
};
#endif // CHROME_BROWSER_FAVICON_SERVICE_H__
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