1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef COMPONENTS_OMNIBOX_ANSWERS_CACHE_H_ 6 #define COMPONENTS_OMNIBOX_ANSWERS_CACHE_H_ 7 8 #include <list> 9 10 #include "base/basictypes.h" 11 #include "base/strings/string16.h" 12 13 struct AnswersQueryData { 14 AnswersQueryData(); 15 AnswersQueryData(const base::string16& full_query_text, 16 const base::string16& query_type); 17 base::string16 full_query_text; 18 base::string16 query_type; 19 }; 20 21 // Cache for the most-recently seen answer for Answers in Suggest. 22 class AnswersCache { 23 public: 24 explicit AnswersCache(size_t max_entries); 25 ~AnswersCache(); 26 27 // Gets the top answer query completion for the query term. The query data 28 // will contain empty query text and type if no matching data was found. 29 AnswersQueryData GetTopAnswerEntry(const base::string16& query); 30 31 // Registers a query that received an answer suggestion. 32 void UpdateRecentAnswers(const base::string16& full_query_text, 33 const base::string16& query_type); 34 35 // Signals if cache is empty. 36 bool empty() const { return cache_.empty(); } 37 38 private: 39 size_t max_entries_; 40 typedef std::list<AnswersQueryData> Cache; 41 Cache cache_; 42 43 DISALLOW_COPY_AND_ASSIGN(AnswersCache); 44 }; 45 46 #endif // COMPONENTS_OMNIBOX_ANSWERS_CACHE_H_ 47
