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apq-links.ads
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-- --
-- package APQ.Links Copyright (c) Dmitry A. Kazakov --
-- Interface Luebeck --
-- Winter, 2004 --
-- --
-- Last revision : 18:59 10 Feb 2008 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
--
-- This package is used to deal with a reference table. A reference
-- table has two columns:
--
-- dependant : INTEGER (object identifier)
-- reference : INTEGER (object identifier)
--
-- A record is present in the table if dependant depends on reference.
-- Not collected objects depend on themselves.
--
with APQ.Common; use APQ.Common;
with APQ.Keys; use APQ.Keys;
with APQ.Keys.Arrays; use APQ.Keys.Arrays;
with APQ.Keys.Sets; use APQ.Keys.Sets;
package APQ.Links is
pragma Elaborate_Body (APQ.Links);
--
-- Create_Table -- Create a dependency table if not exists
--
-- Data_Base - The data base
-- Table_Name - The table to create
--
-- Exceptions :
--
-- Data_Error - A data base error
-- Use_Error - Data base access violation
--
procedure Create_Table
( Data_Base : in out APQ_Data_Base;
Table_Name : String
);
--
-- Delete -- An object from the table
--
-- Data_Base - The data base
-- Table_Name - The table name
-- Object - The object (an identifier of)
--
-- Exceptions :
--
-- Data_Error - Data base error
-- Use_Error - Data base access violation
--
procedure Delete
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Object : Object_ID
);
--
-- Depends_On -- Dependency test
--
-- Data_Base - The data base
-- Table_Name - The table name
-- Dependant - An object to test (an identifier of)
-- Referent - An object to test (an identifier of)
--
-- Returns :
--
-- True if Dependant depends on Referent
--
-- Exceptions :
--
-- Data_Error - Data base error
-- Use_Error - Data base access violation
--
function Depends_On
( Data_Base : APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referent : Object_ID
) return Boolean;
--
-- Get_Dependants -- Get the dependency list
--
-- Data_Base - The data base
-- Table_Name - The table name
-- Referent - An object (an identifier of)
-- Dependants - The set of dependants (identifiers of)
--
-- This procedure adds the identifiers of the objects dependent on the
-- object identified by Referent to the set Dependants. This never
-- includes Referent itself.
--
-- Exceptions :
--
-- Data_Error - Data base error
-- Use_Error - Data base access violation
--
procedure Get_Dependants
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Referent : Object_ID;
Dependants : in out Set
);
--
-- Get_References -- Get the references list
--
-- Data_Base - The data base
-- Table_Name - The table name
-- Dependant - An object (an identifier of)
-- Referents - The array of references to fill (identifiers of)
-- Pointer - The index in Referents to start at
--
-- This procedure adds the identifiers of the objects referring the
-- object identified by Dependant to the array Referents. This never
-- includes Dependant itself. The first element is added at the position
-- Pointer. Pointer is advanced to the next position.
--
-- Exceptions :
--
-- Data_Error - Data base error
--
-- Effects :
--
-- Command is modified
--
procedure Get_References
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referents : in out Unbounded_Array;
Pointer : in out Integer
);
--
-- Get_References -- Get the references list
--
-- Data_Base - The data base
-- Table_Name - The table name
-- Dependant - An object (an identifier of)
-- Referents - The set of references (identifiers of)
--
-- This procedure adds the identifiers of the objects referring the
-- object identified by Dependant to the set Referents. This never
-- includes Dependant itself.
--
-- Exceptions :
--
-- Data_Error - Data base error
-- Use_Error - Data base access violation
--
procedure Get_References
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referents : in out Set
);
--
-- Has_Dependants -- Check the dependency list
--
-- Data_Base - The data base
-- Table_Name - The table name
-- Data_Type - The SQL data type used for indentifiers
-- Referent - An object (an identifier of)
--
-- Returns :
--
-- True if the list of dependants is not empty
--
-- Exceptions :
--
-- Data_Error - Data base error
-- Use_Error - Data base access violation
--
function Has_Dependants
( Data_Base : APQ_Data_Base;
Table_Name : String;
Referent : Object_ID
) return Boolean;
--
-- Reference -- Add a reference
--
-- Data_Base - The data base
-- Table_Name - The table name
-- Dependant - Dependent object (an identifier of)
-- Referent - Referenced object (an identifier of)
--
-- Exceptions :
--
-- Data_Error - Data base error
-- Use_Error - Data base access violation
--
procedure Reference
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referent : Object_ID
);
--
-- Unreference -- Remove a reference
--
-- Data_Base - The data base
-- Table_Name - The table name
-- Dependant - Dependent object (an identifier of)
-- Referent - Referenced object (an identifier of)
--
-- Exceptions :
--
-- Data_Error - Data base error
-- Use_Error - Data base access violation
--
procedure Unreference
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referent : Object_ID
);
end APQ.Links;