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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_OMNIBOX_BROWSER_MATCH_COMPARE_H_
#define COMPONENTS_OMNIBOX_BROWSER_MATCH_COMPARE_H_
#include "components/omnibox/browser/omnibox_field_trial.h"
#include "third_party/metrics_proto/omnibox_event.pb.h"
using PageClassification = metrics::OmniboxEventProto::PageClassification;
// This class implements a special version of AutocompleteMatch::MoreRelevant
// that allows matches of particular types to be demoted in AutocompleteResult.
template <class Match>
class CompareWithDemoteByType {
public:
CompareWithDemoteByType(PageClassification page_classification) {
OmniboxFieldTrial::GetDemotionsByType(page_classification, &demotions_);
}
// Returns the relevance score of |match| demoted appropriately by
// |demotions_by_type_|.
int GetDemotedRelevance(const Match& match) const {
auto demotion_it = demotions_.find(match.type);
// Add a check here to ensure we don't demote `NAVSUGGEST` matches created
// by the `EnterpriseSearchAggregatorProvider`. This allows users to see
// `EnterpriseSearchAggregatorProvider` suggestions in the realbox.
// TODO(crbug.com/419303069): If additional requirements for demotion
// specific to a provider emerges, we should refactor
// `CompareWithDemoteByType` to `CompareWithDemoteByProviderAndType`.
return (demotion_it == demotions_.end() ||
(match.type == AutocompleteMatchType::NAVSUGGEST &&
match.provider->type() ==
AutocompleteProvider::Type::TYPE_ENTERPRISE_SEARCH_AGGREGATOR))
? match.relevance
: (match.relevance * demotion_it->second);
}
// Comparison function.
bool operator()(const Match& elem1, const Match& elem2) {
// Compute demoted relevance scores for each match.
const int demoted_relevance1 = GetDemotedRelevance(elem1);
const int demoted_relevance2 = GetDemotedRelevance(elem2);
if (demoted_relevance1 != demoted_relevance2) {
// Greater relevance should come first.
return demoted_relevance1 > demoted_relevance2;
}
// For equal-relevance matches, we sort alphabetically, so that providers
// who return multiple elements at the same priority get a "stable" sort
// across multiple updates.
return elem1.contents < elem2.contents;
}
private:
OmniboxFieldTrial::DemotionMultipliers demotions_;
};
#endif // COMPONENTS_OMNIBOX_BROWSER_MATCH_COMPARE_H_
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