Componentize HistoryDatabase

components/history/core/android/sql_handler.h

-// 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 COMPONENTS_HISTORY_CORE_ANDROID_SQL_HANDLER_H_
-#define COMPONENTS_HISTORY_CORE_ANDROID_SQL_HANDLER_H_
-
-#include "components/history/core/android/android_history_types.h"
-
-namespace history {
-
-// This is a wrapper of information needed for Insert/Update/Delete
-// method in SQLHandler. Refer to SQLHandler's comment below for how
-// it is used.
-struct TableIDRow {
-  TableIDRow();
-  ~TableIDRow();
-
-  URLID url_id;
-  GURL url;
-  // Whether the URL was bookmarked.
-  bool bookmarked;
-};
-
-typedef std::vector<TableIDRow> TableIDRows;
-
-// This base class is used by AndroidProviderBackend to manipulate the indvidual
-// table or BookmarkModel in its Insert/Update/Delete method.
-//
-// The implementation needs to provides an array of columns. Once the columns
-// are inserted or updated, the corresponding Insert() or Update() method will
-// be invoked. The Delete() method is called to delete rows.
-//
-// The HistoryAndBookmarkRow given in Insert() or Update() provide the data for
-// insert or update. No all the data in HistoryAndBookmarkRow maybe valid, using
-// HistoryAndBookmarkRow::is_value_set_explicitly() method to see if the data
-// need be inserted or updated.
-class SQLHandler {
- public:
-  // |columns| is the implementation's columns.
-  // |column_count| is the number of column in |columns|.
-  SQLHandler(const HistoryAndBookmarkRow::ColumnID columns[], int column_count);
-  virtual ~SQLHandler();
-
-  // Updates the rows whose URLID or URL is in the given |ids_set| with new
-  // value stored in |row|. Return true if the update succeeds.
-  virtual bool Update(const HistoryAndBookmarkRow& row,
-                      const TableIDRows& ids_set) = 0;
-
-  // Inserts the given |row|, return true on success; The id of insertted row
-  // should be set in |row|, so other implemnetations could use it to complete
-  // the insert.
-  virtual bool Insert(HistoryAndBookmarkRow* row) = 0;
-
-  // Deletes the rows whose id is in |ids_set|, returns false if any deletion
-  // failed, otherwise return true even all/some of rows are not found.
-  virtual bool Delete(const TableIDRows& ids_set) = 0;
-
-  // Return true if |row| has a value explicitly set for at least one of the
-  // columns in |row| that are known to this class.
-  bool HasColumnIn(const HistoryAndBookmarkRow& row);
-
-  // Returns true if |id| is one of the columns known to this class.
-  bool HasColumn(HistoryAndBookmarkRow::ColumnID id);
-
- private:
-  // The columns of this handler.
-  const std::set<HistoryAndBookmarkRow::ColumnID> columns_;
-
-  DISALLOW_COPY_AND_ASSIGN(SQLHandler);
-};
-
-}  // namespace history.
-
-#endif  // COMPONENTS_HISTORY_CORE_ANDROID_SQL_HANDLER_H_