chrome/browser/resources_util.cc

   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 #include "chrome/browser/resources_util.h"
   6
   7 #include <utility>
   8
   9 #include "base/containers/hash_tables.h"
  10 #include "base/lazy_instance.h"
  11 #include "grit/theme_resources_map.h"
  12 #include "grit/ui_resources_map.h"
  13
  14 #if defined(OS_CHROMEOS)
  15 #include "grit/ui_chromeos_resources_map.h"
  16 #endif
  17
  18 namespace {
  19
  20 // A wrapper class that holds a hash_map between resource strings and resource
  21 // ids.  This is done so we can use base::LazyInstance which takes care of
  22 // thread safety in initializing the hash_map for us.
  23 class ThemeMap {
  24  public:
  25   typedef base::hash_map<std::string, int> StringIntMap;
  26
  27   ThemeMap() {
  28     for (size_t i = 0; i < kThemeResourcesSize; ++i)
  29       id_map_[kThemeResources[i].name] = kThemeResources[i].value;
  30     for (size_t i = 0; i < kUiResourcesSize; ++i)
  31       id_map_[kUiResources[i].name] = kUiResources[i].value;
  32 #if defined(OS_CHROMEOS)
  33     for (size_t i = 0; i < kUiChromeosResourcesSize; ++i)
  34       id_map_[kUiChromeosResources[i].name] = kUiChromeosResources[i].value;
  35 #endif
  36   }
  37
  38   int GetId(const std::string& resource_name) {
  39     StringIntMap::const_iterator it = id_map_.find(resource_name);
  40     if (it == id_map_.end())
  41       return -1;
  42     return it->second;
  43   }
  44
  45  private:
  46   StringIntMap id_map_;
  47 };
  48
  49 static base::LazyInstance<ThemeMap> g_theme_ids = LAZY_INSTANCE_INITIALIZER;
  50
  51 }  // namespace
  52
  53 int ResourcesUtil::GetThemeResourceId(const std::string& resource_name) {
  54   return g_theme_ids.Get().GetId(resource_name);
  55 }