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// Copyright 2014 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_ANSWERS_CACHE_H_
#define COMPONENTS_OMNIBOX_BROWSER_ANSWERS_CACHE_H_
#include <stddef.h>
#include <list>
#include <string>
#include "third_party/omnibox_proto/answer_type.pb.h"
struct AnswersQueryData {
AnswersQueryData();
AnswersQueryData(const std::u16string& full_query_text,
omnibox::AnswerType query_type);
std::u16string full_query_text;
omnibox::AnswerType query_type;
};
// Cache for the most-recently seen answer for Answers in Suggest.
class AnswersCache {
public:
explicit AnswersCache(size_t max_entries);
~AnswersCache();
AnswersCache(const AnswersCache&) = delete;
AnswersCache& operator=(const AnswersCache&) = delete;
// Gets the top answer query completion for the query term. The query data
// will contain empty query text and type if no matching data was found.
AnswersQueryData GetTopAnswerEntry(const std::u16string& query);
// Registers a query that received an answer suggestion.
void UpdateRecentAnswers(const std::u16string& full_query_text,
omnibox::AnswerType query_type);
// Signals if cache is empty.
bool empty() const { return cache_.empty(); }
private:
size_t max_entries_;
typedef std::list<AnswersQueryData> Cache;
Cache cache_;
};
#endif // COMPONENTS_OMNIBOX_BROWSER_ANSWERS_CACHE_H_
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