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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_CLD_HELPER_H_
#define CHROME_BROWSER_CLD_HELPER_H_
#include <string>
#include "base/ref_counted.h"
class TabContents;
// The CLDHelper class detects the language of a page, using the toolbar CLD
// library. (CLD stands for Compact Language Detection.)
// It should be created and the detection process started on the UI thread.
// The detection happens on the file thread and
// TabContents::PageLanguageDetected() is then called on the associated
// TabContents when the language has been detected.
class CLDHelper : public base::RefCountedThreadSafe<CLDHelper> {
public:
// |tab_contents| should reference the TabContents the page is related to.
// |renderer_process_id|, |page_id| and |page_contents| are the id of the
// render process, the id and contents of the page the language is queried.
CLDHelper(TabContents* tab_contents,
int renderer_process_id,
int page_id,
const std::wstring& page_content);
// Starts the process of detecting the language of the page.
void DetectLanguage();
// Cancel any pending language detection, meaning that the TabContents will
// not be notified.
// This should be on the same thread as DetectLanguage was called.
void CancelLanguageDetection();
int renderer_process_id() const { return renderer_process_id_; }
int page_id() const { return page_id_; }
std::string language() const { return language_; }
private:
// Private because the class is ref counted.
friend class base::RefCountedThreadSafe<CLDHelper>;
~CLDHelper() {}
// Performs the actual work of detecting the language.
void DoDetectLanguage();
// Invoked on the UI thread once the language has been detected.
void DetectionDone();
// The tab contents for which the language is being detected.
TabContents* tab_contents_;
// The id for the render process the page belongs to.
int renderer_process_id_;
// The id and content of the page for which the language is being detected.
int page_id_;
std::wstring page_content_;
// The language that was detected.
std::string language_;
DISALLOW_COPY_AND_ASSIGN(CLDHelper);
};
#endif // CHROME_BROWSER_CLD_HELPER_H_
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