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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_FEATURE_VISITOR_H_
#define BASE_FEATURE_VISITOR_H_
#include <map>
#include <string>
#include "base/feature_list.h"
namespace variations::cros_early_boot::evaluate_seed {
class EarlyBootFeatureVisitor;
}
namespace gin {
class V8FeatureVisitor;
}
namespace base {
class TestFeatureVisitor;
// An interface for FeatureList that provides a method to iterate over a
// feature's name, override state, parameters, and associated field trial.
//
// NOTE: This is intended only for the special case of needing to get all
// feature overrides. Most users should call FeatureList::IsEnabled() to query
// a feature's state.
class FeatureVisitor {
public:
FeatureVisitor(const FeatureVisitor&) = delete;
FeatureVisitor& operator=(const FeatureVisitor&) = delete;
virtual ~FeatureVisitor() = default;
// Intended to be called in FeatureList::VisitFeaturesAndParams(). This method
// is called once per feature.
virtual void Visit(const std::string& feature_name,
FeatureList::OverrideState override_state,
const std::map<std::string, std::string>& params,
const std::string& trial_name,
const std::string& group_name) = 0;
private:
friend variations::cros_early_boot::evaluate_seed::EarlyBootFeatureVisitor;
friend gin::V8FeatureVisitor;
friend TestFeatureVisitor;
// The constructor is private so only friend classes can inherit from this
// class. This limits access to who can iterate over features in
// FeatureList::VisitFeaturesAndParams().
FeatureVisitor() = default;
};
} // namespace base
#endif // BASE_FEATURE_VISITOR_H_
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