Protector strings and bubble/SettingsChange code refactoring.

chrome/browser/protector/base_setting_change.h

+// Copyright (c) 2011 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_PROTECTOR_BASE_SETTING_CHANGE_H_
+#define CHROME_BROWSER_PROTECTOR_BASE_SETTING_CHANGE_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+
+class TemplateURL;
+
+namespace protector {
+
+class Protector;
+
+// Base class for setting change tracked by Protector.
+class BaseSettingChange {
+ public:
+  BaseSettingChange();
+  virtual ~BaseSettingChange();
+
+  // Applies initial actions to the setting if needed. Must be called before
+  // any other calls are made, including text getters. Returns true if
+  // initialization was successful.
+  virtual bool Init(Protector* protector);
+
+  // Persists new setting if needed.
+  virtual void Apply(Protector* protector);
+
+  // Restores old setting if needed.
+  virtual void Discard(Protector* protector);
+
+  // Returns the wrench menu item and bubble title.
+  virtual string16 GetBubbleTitle() const = 0;
+
+  // Returns the bubble message text.
+  virtual string16 GetBubbleMessage() const = 0;
+
+  // Returns text for the button to apply the change with |Apply|.
+  // Returns empty string if no apply button should be shown.
+  virtual string16 GetApplyButtonText() const = 0;
+
+  // Returns text for the button to discard the change with |Discard|.
+  virtual string16 GetDiscardButtonText() const = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BaseSettingChange);
+};
+
+// TODO(ivankr): CompositeSettingChange that incapsulates multiple
+// BaseSettingChange instances.
+
+// Allocates and initializes SettingChange implementation for default search
+// provider setting. Both |actual| and |backup| may be NULL if corresponding
+// values are unknown or invalid.
+BaseSettingChange* CreateDefaultSearchProviderChange(
+    const TemplateURL* actual,
+    const TemplateURL* backup);
+
+}  // namespace protector
+
+#endif  // CHROME_BROWSER_PROTECTOR_BASE_SETTING_CHANGE_H_