apps/app_shim/app_shim_handler_mac.cc

   1 // Copyright 2013 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 #include "apps/app_shim/app_shim_handler_mac.h"
   6
   7 #include <map>
   8
   9 #include "base/logging.h"
  10 #include "base/memory/singleton.h"
  11
  12 namespace apps {
  13
  14 namespace {
  15
  16 class AppShimHandlerRegistry {
  17  public:
  18   static AppShimHandlerRegistry* GetInstance() {
  19     return Singleton<AppShimHandlerRegistry,
  20                      LeakySingletonTraits<AppShimHandlerRegistry> >::get();
  21   }
  22
  23   AppShimHandler* GetForAppMode(const std::string& app_mode_id) const {
  24     HandlerMap::const_iterator it = handlers_.find(app_mode_id);
  25     if (it != handlers_.end())
  26       return it->second;
  27
  28     return default_handler_;
  29   }
  30
  31   bool SetForAppMode(const std::string& app_mode_id, AppShimHandler* handler) {
  32     bool inserted_or_removed = handler ?
  33         handlers_.insert(HandlerMap::value_type(app_mode_id, handler)).second :
  34         handlers_.erase(app_mode_id) == 1;
  35     DCHECK(inserted_or_removed);
  36     return inserted_or_removed;
  37   }
  38
  39   void SetDefaultHandler(AppShimHandler* handler) {
  40     DCHECK_NE(default_handler_ == NULL, handler == NULL);
  41     default_handler_ = handler;
  42   }
  43
  44  private:
  45   friend struct DefaultSingletonTraits<AppShimHandlerRegistry>;
  46   typedef std::map<std::string, AppShimHandler*> HandlerMap;
  47
  48   AppShimHandlerRegistry() : default_handler_(NULL) {}
  49   ~AppShimHandlerRegistry() {}
  50
  51   HandlerMap handlers_;
  52   AppShimHandler* default_handler_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(AppShimHandlerRegistry);
  55 };
  56
  57 }  // namespace
  58
  59 // static
  60 void AppShimHandler::RegisterHandler(const std::string& app_mode_id,
  61                                      AppShimHandler* handler) {
  62   DCHECK(handler);
  63   AppShimHandlerRegistry::GetInstance()->SetForAppMode(app_mode_id, handler);
  64 }
  65
  66 // static
  67 void AppShimHandler::RemoveHandler(const std::string& app_mode_id) {
  68   AppShimHandlerRegistry::GetInstance()->SetForAppMode(app_mode_id, NULL);
  69 }
  70
  71 // static
  72 AppShimHandler* AppShimHandler::GetForAppMode(const std::string& app_mode_id) {
  73   return AppShimHandlerRegistry::GetInstance()->GetForAppMode(app_mode_id);
  74 }
  75
  76 // static
  77 void AppShimHandler::SetDefaultHandler(AppShimHandler* handler) {
  78   AppShimHandlerRegistry::GetInstance()->SetDefaultHandler(handler);
  79 }
  80
  81 }  // namespace apps