extensions/browser/declarative_user_script_manager.h

   1 // Copyright 2014 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 EXTENSIONS_BROWSER_DECLARATIVE_USER_SCRIPT_MANAGER_H_
   6 #define EXTENSIONS_BROWSER_DECLARATIVE_USER_SCRIPT_MANAGER_H_
   7
   8 #include <map>
   9
  10 #include "base/macros.h"
  11 #include "base/memory/linked_ptr.h"
  12 #include "base/scoped_observer.h"
  13 #include "extensions/browser/extension_registry_observer.h"
  14 #include "extensions/common/host_id.h"
  15
  16 namespace content {
  17 class BrowserContext;
  18 }
  19
  20 namespace extensions {
  21 class DeclarativeUserScriptMaster;
  22
  23 // Manages a set of DeclarativeUserScriptMaster objects for script injections.
  24 class DeclarativeUserScriptManager : public ExtensionRegistryObserver {
  25  public:
  26   explicit DeclarativeUserScriptManager(
  27       content::BrowserContext* browser_context);
  28   ~DeclarativeUserScriptManager() override;
  29
  30   // Gets the user script master for declarative scripts by the given
  31   // HostID; if one does not exist, a new object will be created.
  32   DeclarativeUserScriptMaster* GetDeclarativeUserScriptMasterByID(
  33       const HostID& host_id);
  34
  35  private:
  36   using UserScriptMasterMap =
  37       std::map<HostID, linked_ptr<DeclarativeUserScriptMaster>>;
  38
  39   // ExtensionRegistryObserver:
  40   void OnExtensionUnloaded(content::BrowserContext* browser_context,
  41                            const Extension* extension,
  42                            UnloadedExtensionInfo::Reason reason) override;
  43
  44   // Creates a DeclarativeUserScriptMaster object.
  45   DeclarativeUserScriptMaster* CreateDeclarativeUserScriptMaster(
  46       const HostID& host_id);
  47
  48   // A map of DeclarativeUserScriptMasters for each host; each master
  49   // is lazily initialized.
  50   UserScriptMasterMap declarative_user_script_masters_;
  51
  52   content::BrowserContext* browser_context_;
  53
  54   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
  55       extension_registry_observer_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(DeclarativeUserScriptManager);
  58 };
  59
  60 }  // namespace extensions
  61
  62 #endif  // EXTENSIONS_BROWSER_DECLARATIVE_USER_SCRIPT_MANAGER_H_