Refactoring: Create TranslateScript from TranslateManager

chrome/browser/translate/translate_script.h

+// Copyright 2013 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_TRANSLATE_TRANSLATE_SCRIPT_H_
+#define CHROME_BROWSER_TRANSLATE_TRANSLATE_SCRIPT_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time.h"
+
+class TranslateURLFetcher;
+
+class TranslateScript {
+ public:
+  typedef base::Callback<void(bool, const std::string&)> Callback;
+
+  TranslateScript();
+  virtual ~TranslateScript();
+
+  // Returns the feched the translate script.
+  const std::string& data() { return data_; }
+
+  // Used by unit-tests to override some defaults:
+  // Delay after which the translate script is fetched again from the
+  // translation server.
+  void set_expiration_delay(int delay_ms) {
+    expiration_delay_ = base::TimeDelta::FromMilliseconds(delay_ms);
+  }
+
+  // Clears the translate script, so it will be fetched next time we translate.
+  void Clear() { data_.clear(); }
+
+  // Fetches the JS translate script (the script that is injected in the page
+  // to translate it).
+  void Request(const Callback& callback);
+
+  // Returns true if this has a pending request.
+  bool HasPendingRequest() const { return fetcher_.get() != NULL; }
+
+ private:
+  // The callback when the script is fetched or a server error occured.
+  void OnScriptFetchComplete(int id, bool success, const std::string& data);
+
+  base::WeakPtrFactory<TranslateScript> weak_method_factory_;
+
+  // URL fetcher to fetch the translate script.
+  scoped_ptr<TranslateURLFetcher> fetcher_;
+
+  // The JS injected in the page to do the translation.
+  std::string data_;
+
+  // Delay after which the translate script is fetched again from the translate
+  // server.
+  base::TimeDelta expiration_delay_;
+
+  // The callback called when the server sends a response.
+  Callback callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(TranslateScript);
+};
+
+#endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_SCRIPT_H_