1// Copyright (c) 2010 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
13namespace {
14
15// A wrapper class that holds a hash_map between resource strings and resource
16// ids.  This is done so we can use base::LazyInstance which takes care of
17// thread safety in initializing the hash_map for us.
18class ThemeMap {
19 public:
20  typedef base::hash_map<std::string, int> StringIntMap;
21
22  ThemeMap() {
23    for (size_t i = 0; i < kThemeResourcesSize; ++i) {
24      id_map_[kThemeResources[i].name] = kThemeResources[i].value;
25    }
26  }
27
28  int GetId(const std::string& resource_name) {
29    StringIntMap::const_iterator it = id_map_.find(resource_name);
30    if (it == id_map_.end())
31      return -1;
32    return it->second;
33  }
34
35 private:
36  StringIntMap id_map_;
37};
38
39static base::LazyInstance<ThemeMap> g_theme_ids(base::LINKER_INITIALIZED);
40
41}  // namespace
42
43int ResourcesUtil::GetThemeResourceId(const std::string& resource_name) {
44  return g_theme_ids.Get().GetId(resource_name);
45}
46