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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_FILE_MANAGER_INDEXING_TOKEN_TABLE_H_
#define CHROMEOS_ASH_COMPONENTS_FILE_MANAGER_INDEXING_TOKEN_TABLE_H_
#include <memory>
#include <optional>
#include <string>
#include "base/component_export.h"
#include "chromeos/ash/components/file_manager/indexing/text_table.h"
#include "sql/database.h"
namespace ash::file_manager {
// A table that maintains a mapping from a unique token ID to the token text.
// Tokens for us are any pieces of text associated with some file. For example,
// if a file is labeled as "downloaded", the "downloaded" text is considered
// a token. In this table it is assigned a unique integer ID that is used
// across other tables for information retrieval.
class COMPONENT_EXPORT(FILE_MANAGER) TokenTable : public TextTable {
public:
// Creates a new table and passes the pointer to the SQL database to it. The
// caller must make sure it owns both the sql::Database object and this table.
// The caller also must make sure that the sql::Database outlives the table.
explicit TokenTable(sql::Database* db);
~TokenTable() override;
TokenTable(const TokenTable&) = delete;
TokenTable& operator=(const TokenTable&) = delete;
// Deletes the given token from the table. Returns -1, if the token was not
// found. Otherwise, returns the ID that the token was assigned.
int64_t DeleteToken(const std::string& token_bytes);
// Gets the token ID for the given token bytes. If the token cannot be found,
// this method returns -1.
int64_t GetTokenId(const std::string& token_bytes) const;
// For the given `token_id` attempts to find the corresponding token value.
// If one cannot be found, returns -1. Otherwise returns `token_id` and fills
// the token with the found value.
std::optional<std::string> GetToken(int64_t token_id) const;
// Gets or creates the unique token ID for the given token bytes.
int64_t GetOrCreateTokenId(const std::string& token_bytes);
// Changes the token value from the `from` value to the `to` value, if the
// `from` value exists. Returns the ID of the changed token if the operation
// was successful, or -1 otherwise.
int64_t ChangeToken(const std::string& from, const std::string& to);
protected:
std::unique_ptr<sql::Statement> MakeGetValueIdStatement() const override;
std::unique_ptr<sql::Statement> MakeGetValueStatement() const override;
std::unique_ptr<sql::Statement> MakeInsertStatement() const override;
std::unique_ptr<sql::Statement> MakeDeleteStatement() const override;
std::unique_ptr<sql::Statement> MakeCreateTableStatement() const override;
std::unique_ptr<sql::Statement> MakeCreateIndexStatement() const override;
std::unique_ptr<sql::Statement> MakeChangeValueStatement() const override;
};
} // namespace ash::file_manager
#endif // CHROMEOS_ASH_COMPONENTS_FILE_MANAGER_INDEXING_TOKEN_TABLE_H_
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