third_party/libwebrtc/test/scoped_key_value_config.h

   1 /*
   2  *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11 #ifndef TEST_SCOPED_KEY_VALUE_CONFIG_H_
  12 #define TEST_SCOPED_KEY_VALUE_CONFIG_H_
  13
  14 #include <functional>
  15 #include <map>
  16 #include <memory>
  17 #include <string>
  18
  19 #include "absl/strings/string_view.h"
  20 #include "api/field_trials_registry.h"
  21 #include "test/field_trial.h"
  22
  23 namespace webrtc {
  24 namespace test {
  25
  26 class ScopedKeyValueConfig : public FieldTrialsRegistry {
  27  public:
  28   virtual ~ScopedKeyValueConfig();
  29   ScopedKeyValueConfig();
  30   explicit ScopedKeyValueConfig(absl::string_view s);
  31   ScopedKeyValueConfig(ScopedKeyValueConfig& parent, absl::string_view s);
  32
  33  private:
  34   ScopedKeyValueConfig(ScopedKeyValueConfig* parent, absl::string_view s);
  35   ScopedKeyValueConfig* GetRoot(ScopedKeyValueConfig* n);
  36   std::string GetValue(absl::string_view key) const override;
  37   std::string LookupRecurse(absl::string_view key) const;
  38
  39   ScopedKeyValueConfig* const parent_;
  40
  41   // The leaf in a list of stacked ScopedKeyValueConfig.
  42   // Only set on root (e.g with parent_ == nullptr).
  43   const ScopedKeyValueConfig* leaf_;
  44
  45   // Unlike std::less<std::string>, std::less<> is transparent and allows
  46   // heterogeneous lookup directly with absl::string_view.
  47   std::map<std::string, std::string, std::less<>> key_value_map_;
  48   std::unique_ptr<ScopedFieldTrials> scoped_field_trials_;
  49 };
  50
  51 }  // namespace test
  52 }  // namespace webrtc
  53
  54 #endif  // TEST_SCOPED_KEY_VALUE_CONFIG_H_