chrome/browser/resources_util.cc

   1 // Copyright (c) 2011 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/hash_tables.h"
  10 #include "base/lazy_instance.h"
  11 #include "grit/theme_resources_map.h"
  12 #include "grit/theme_resources_standard_map.h"
  13
  14 namespace {
  15
  16 // A wrapper class that holds a hash_map between resource strings and resource
  17 // ids.  This is done so we can use base::LazyInstance which takes care of
  18 // thread safety in initializing the hash_map for us.
  19 class ThemeMap {
  20  public:
  21   typedef base::hash_map<std::string, int> StringIntMap;
  22
  23   ThemeMap() {
  24     for (size_t i = 0; i < kThemeResourcesSize; ++i) {
  25       id_map_[kThemeResources[i].name] = kThemeResources[i].value;
  26     }
  27     for (size_t i = 0; i < kThemeResourcesStandardSize; ++i) {
  28       id_map_[kThemeResourcesStandard[i].name] =
  29           kThemeResourcesStandard[i].value;
  30     }
  31   }
  32
  33   int GetId(const std::string& resource_name) {
  34     StringIntMap::const_iterator it = id_map_.find(resource_name);
  35     if (it == id_map_.end())
  36       return -1;
  37     return it->second;
  38   }
  39
  40  private:
  41   StringIntMap id_map_;
  42 };
  43
  44 static base::LazyInstance<ThemeMap> g_theme_ids(base::LINKER_INITIALIZED);
  45
  46 }  // namespace
  47
  48 int ResourcesUtil::GetThemeResourceId(const std::string& resource_name) {
  49   return g_theme_ids.Get().GetId(resource_name);
  50 }