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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WEB_UI_OVERRIDE_REGISTRAR_H_
      6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEB_UI_OVERRIDE_REGISTRAR_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/scoped_observer.h"
     10 #include "extensions/browser/browser_context_keyed_api_factory.h"
     11 #include "extensions/browser/extension_registry_observer.h"
     12 
     13 namespace content {
     14 class BrowserContext;
     15 }
     16 
     17 namespace extensions {
     18 class ExtensionRegistry;
     19 
     20 class ExtensionWebUIOverrideRegistrar : public BrowserContextKeyedAPI,
     21                                         public ExtensionRegistryObserver {
     22  public:
     23   explicit ExtensionWebUIOverrideRegistrar(content::BrowserContext* context);
     24   virtual ~ExtensionWebUIOverrideRegistrar();
     25 
     26   // BrowserContextKeyedAPI implementation.
     27   static BrowserContextKeyedAPIFactory<ExtensionWebUIOverrideRegistrar>*
     28       GetFactoryInstance();
     29 
     30  private:
     31   friend class BrowserContextKeyedAPIFactory<ExtensionWebUIOverrideRegistrar>;
     32 
     33   // ExtensionRegistryObserver implementation.
     34   virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
     35                                  const Extension* extension) OVERRIDE;
     36   virtual void OnExtensionUnloaded(
     37       content::BrowserContext* browser_context,
     38       const Extension* extension,
     39       UnloadedExtensionInfo::Reason reason) OVERRIDE;
     40 
     41   // BrowserContextKeyedAPI implementation.
     42   static const char* service_name() {
     43     return "ExtensionWebUIOverrideRegistrar";
     44   }
     45 
     46   // Listen to extension load, unloaded notifications.
     47   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
     48       extension_registry_observer_;
     49 
     50   DISALLOW_COPY_AND_ASSIGN(ExtensionWebUIOverrideRegistrar);
     51 };
     52 
     53 }  // namespace extensions
     54 
     55 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEB_UI_OVERRIDE_REGISTRAR_H_
     56