ios/web/browser_state.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 "ios/web/public/browser_state.h"
   6
   7 namespace web {
   8 namespace {
   9 // Private key used for safe conversion of base::SupportsUserData to
  10 // web::BrowserState in web::BrowserState::FromSupportsUserData.
  11 const char kBrowserStateIdentifierKey[] = "BrowserStateIdentifierKey";
  12 }
  13
  14 BrowserState::BrowserState() {
  15   // (Refcounted)?BrowserStateKeyedServiceFactories needs to be able to convert
  16   // a base::SupportsUserData to a BrowserState. Moreover, since the factories
  17   // may be passed a content::BrowserContext instead of a BrowserState, attach
  18   // an empty object to this via a private key.
  19   SetUserData(kBrowserStateIdentifierKey, new SupportsUserData::Data);
  20 }
  21
  22 BrowserState::~BrowserState() {
  23 }
  24
  25 // static
  26 BrowserState* BrowserState::FromSupportsUserData(
  27     base::SupportsUserData* supports_user_data) {
  28   if (!supports_user_data ||
  29       !supports_user_data->GetUserData(kBrowserStateIdentifierKey)) {
  30     return nullptr;
  31   }
  32   return static_cast<BrowserState*>(supports_user_data);
  33 }
  34 }  // namespace web