Extension Settings API: make it so that when leveldb storage areas fail to be

chrome/browser/extensions/settings/settings_test_util.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_EXTENSIONS_SETTINGS_SETTINGS_TEST_UTIL_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_TEST_UTIL_H_
 #pragma once
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/settings/settings_storage_factory.h"
 #include "chrome/browser/extensions/test_extension_service.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/test/base/testing_profile.h"
 
+namespace extensions {
+
 class SettingsFrontend;
-
-namespace extensions {
+class SettingsStorage;
 
 // Utilities for extension settings API tests.
 namespace settings_test_util {
 
 // Synchronously gets the storage area for an extension from |frontend|.
 SettingsStorage* GetStorage(
     const std::string& extension_id, SettingsFrontend* frontend);
 
 // An ExtensionService which allows extensions to be hand-added to be returned
 // by GetExtensionById.
@@ skipping 24 matching lines @@
   MockExtensionService* GetMockExtensionService();
 
   virtual ExtensionService* GetExtensionService() OVERRIDE;
   virtual ExtensionEventRouter* GetExtensionEventRouter() OVERRIDE;
 
  private:
   MockExtensionService extension_service_;
   scoped_ptr<ExtensionEventRouter> event_router_;
 };
 
+// A SettingsStorageFactory which delegates to other factories.
+class DelegatingSettingsStorageFactory : public SettingsStorageFactory {
+ public:
+  // Creates with an initial delegate.
+  DelegatingSettingsStorageFactory(
+      // Ownership taken.
+      SettingsStorageFactory* delegate);
+
+  virtual ~DelegatingSettingsStorageFactory();
+
+  // Sets the delegate for Create calls.  The existing delegate is deleted.
+  void Reset(
+      // Ownership taken.
+      SettingsStorageFactory* delegate);
+
+  // SettingsStorageFactory implementation.
+  virtual SettingsStorage* Create(
+      const FilePath& base_path, const std::string& extension_id) OVERRIDE;
+
+ private:
+  scoped_ptr<SettingsStorageFactory> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(DelegatingSettingsStorageFactory);
+};
+
+// A SettingsStorageFactory which always returns NULL.
+class NullSettingsStorageFactory : public SettingsStorageFactory {
+ public:
+  NullSettingsStorageFactory() {}
+  virtual ~NullSettingsStorageFactory() {}
+
+  // SettingsStorageFactory implementation.
+  virtual SettingsStorage* Create(
+      const FilePath& base_path, const std::string& extension_id) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NullSettingsStorageFactory);
+};
+
 }  // namespace settings_test_util
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_TEST_UTIL_H_