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// Copyright (c) 2012 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_UI_WEBUI_NTP_THUMBNAIL_SOURCE_H_
#define CHROME_BROWSER_UI_WEBUI_NTP_THUMBNAIL_SOURCE_H_
#include <map>
#include <string>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "content/public/browser/url_data_source.h"
class Profile;
namespace base {
class RefCountedMemory;
}
namespace thumbnails {
class ThumbnailService;
}
// ThumbnailSource is the gateway between network-level chrome: requests for
// thumbnails and the history/top-sites backend that serves these.
class ThumbnailSource : public content::URLDataSource {
public:
explicit ThumbnailSource(Profile* profile);
// content::URLDataSource implementation.
virtual std::string GetSource() const OVERRIDE;
virtual void StartDataRequest(
const std::string& path,
int render_process_id,
int render_view_id,
const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
virtual base::MessageLoop* MessageLoopForRequestPath(
const std::string& path) const OVERRIDE;
virtual bool ShouldServiceRequest(
const net::URLRequest* request) const OVERRIDE;
private:
virtual ~ThumbnailSource();
// Raw PNG representation of the thumbnail to show when the thumbnail
// database doesn't have a thumbnail for a webpage.
scoped_refptr<base::RefCountedMemory> default_thumbnail_;
// ThumbnailService.
scoped_refptr<thumbnails::ThumbnailService> thumbnail_service_;
// Transient mappings from an ID-based path to an URL-based path.
// The key is an ID-string, the value is a URL string.
// Mappings are added in ShouldServiceRequest() and erased once
// the request is serviced in StartDataRequest().
// TODO(dhollowa): Consider passing the |request| object through
// to the StartDataRequest() call.
mutable std::map<std::string, std::string> id_to_url_map_;
// Only used when servicing requests on the UI thread.
Profile* const profile_;
DISALLOW_COPY_AND_ASSIGN(ThumbnailSource);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_THUMBNAIL_SOURCE_H_
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