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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_ONCE_CONDITION_VALIDATOR_H_
#define COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_ONCE_CONDITION_VALIDATOR_H_
#include <unordered_set>
#include "base/macros.h"
#include "components/feature_engagement_tracker/internal/condition_validator.h"
#include "components/feature_engagement_tracker/public/feature_list.h"
namespace base {
struct Feature;
} // namespace base
namespace feature_engagement_tracker {
class AvailabilityModel;
class Model;
// An ConditionValidator that will ensure that each base::Feature will meet
// conditions maximum one time for any given session.
// It has the following requirements:
// - The Model is ready.
// - No other in-product help is currently showing.
// - FeatureConfig for the feature is valid.
// - This is the first time the given base::Feature meets all above stated
// conditions.
//
// NOTE: This ConditionValidator fully ignores whether the base::Feature is
// enabled or not and any other configuration specified in the FeatureConfig.
// In practice this leads this ConditionValidator to be well suited for a
// demonstration mode of in-product help.
class OnceConditionValidator : public ConditionValidator {
public:
OnceConditionValidator();
~OnceConditionValidator() override;
// ConditionValidator implementation.
ConditionValidator::Result MeetsConditions(
const base::Feature& feature,
const FeatureConfig& config,
const Model& model,
const AvailabilityModel& availability_model,
uint32_t current_day) const override;
void NotifyIsShowing(const base::Feature& feature) override;
void NotifyDismissed(const base::Feature& feature) override;
private:
// Contains all features that have met conditions within the current session.
std::unordered_set<const base::Feature*> shown_features_;
// Which feature that is currently being shown, or nullptr if nothing is
// currently showing.
const base::Feature* currently_showing_feature_;
DISALLOW_COPY_AND_ASSIGN(OnceConditionValidator);
};
} // namespace feature_engagement_tracker
#endif // COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_ONCE_CONDITION_VALIDATOR_H_
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