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// Copyright 2014 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_OMNIBOX_BROWSER_ANSWERS_CACHE_H_
#define COMPONENTS_OMNIBOX_BROWSER_ANSWERS_CACHE_H_
#include <stddef.h>
#include <list>
#include "base/macros.h"
#include "base/strings/string16.h"
struct AnswersQueryData {
AnswersQueryData();
AnswersQueryData(const base::string16& full_query_text,
const base::string16& query_type);
base::string16 full_query_text;
base::string16 query_type;
};
// Cache for the most-recently seen answer for Answers in Suggest.
class AnswersCache {
public:
explicit AnswersCache(size_t max_entries);
~AnswersCache();
// 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 base::string16& query);
// Registers a query that received an answer suggestion.
void UpdateRecentAnswers(const base::string16& full_query_text,
const base::string16& 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_;
DISALLOW_COPY_AND_ASSIGN(AnswersCache);
};
#endif // COMPONENTS_OMNIBOX_BROWSER_ANSWERS_CACHE_H_
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