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// Copyright (c) 2012 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 CHROME_BROWSER_PREDICTORS_AUTOCOMPLETE_ACTION_PREDICTOR_TABLE_H_
#define CHROME_BROWSER_PREDICTORS_AUTOCOMPLETE_ACTION_PREDICTOR_TABLE_H_
#include <string>
#include <vector>
#include "base/string16.h"
#include "chrome/browser/predictors/predictor_table_base.h"
#include "googleurl/src/gurl.h"
namespace predictors {
// This manages the autocomplete predictor table within the SQLite database
// passed in to the constructor. It expects the following scheme:
//
// network_action_predictor
// id A unique id.
// user_text What the user typed.
// url The URL of the entry.
// number_of_hits Number of times the entry was shown to the user and
// selected.
// number_of_misses Number of times the entry was shown to the user but not
// selected.
//
// TODO(dominich): Consider adding this table to one of the history databases.
// In memory is currently used, but adding to the on-disk visits database
// would allow DeleteOldEntries to be cheaper through use of a join.
//
// All the functions apart from constructor and destructor have to be called in
// the DB thread.
class AutocompleteActionPredictorTable : public PredictorTableBase {
public:
struct Row {
// TODO(dominich): Make this 64-bit integer as an optimization. This
// requires some investigation into how to make sure the id is unique for
// each user_text/url pair.
// http://crbug.com/102020
typedef std::string Id;
Row();
// Only used by unit tests.
Row(const Id& id,
const string16& user_text,
const GURL& url,
int number_of_hits,
int number_of_misses);
Row(const Row& row);
Id id;
string16 user_text;
GURL url;
int number_of_hits;
int number_of_misses;
};
typedef std::vector<Row> Rows;
// DB thread functions.
void GetRow(const Row::Id& id, Row* row);
void GetAllRows(Rows* row_buffer);
void AddRow(const Row& row);
void UpdateRow(const Row& row);
void AddAndUpdateRows(const Rows& rows_to_add, const Rows& rows_to_update);
void DeleteRows(const std::vector<Row::Id>& id_list);
void DeleteAllRows();
private:
friend class PredictorDatabaseInternal;
AutocompleteActionPredictorTable();
virtual ~AutocompleteActionPredictorTable();
// PredictorTableBase methods (DB thread).
virtual void CreateTableIfNonExistent() OVERRIDE;
virtual void LogDatabaseStats() OVERRIDE;
DISALLOW_COPY_AND_ASSIGN(AutocompleteActionPredictorTable);
};
} // namespace predictors
#endif // CHROME_BROWSER_PREDICTORS_AUTOCOMPLETE_ACTION_PREDICTOR_TABLE_H_
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