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106 | -----------------------------------------------------------------------
-- util-serialize-contexts -- Contexts for serialization framework
-- Copyright (C) 2010, 2011 Stephane Carrez
-- Written by Stephane Carrez (Stephane.Carrez@gmail.com)
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
-----------------------------------------------------------------------
with Ada.Unchecked_Deallocation;
with Util.Concurrent.Counters;
package body Util.Serialize.Contexts is
procedure Free is new Ada.Unchecked_Deallocation (Data'Class, Data_Access);
-- ------------------------------
-- Context data key
-- ------------------------------
Next_Key : Util.Concurrent.Counters.Counter := Util.Concurrent.Counters.ONE;
-- ------------------------------
-- Allocate a unique data key for a mapper.
-- ------------------------------
procedure Allocate (Key : out Data_Key) is
Val : Integer;
begin
Util.Concurrent.Counters.Increment (Next_Key, Val);
Key := Data_Key (Val);
end Allocate;
function Hash (Key : in Data_Key) return Ada.Containers.Hash_Type is
begin
return Ada.Containers.Hash_Type (Key);
end Hash;
-- ------------------------------
-- Reader context
-- ------------------------------
-- ------------------------------
-- Get the data object associated with the given key.
-- Raises No_Data exception if there is no data object.
-- ------------------------------
function Get_Data (Ctx : in Context;
Key : in Data_Key) return Data_Access is
Pos : constant Data_Map.Cursor := Ctx.Data.Find (Key);
begin
if Data_Map.Has_Element (Pos) then
return Data_Map.Element (Pos);
else
raise No_Data;
end if;
end Get_Data;
-- ------------------------------
-- Set the data object associated with the given key.
-- ------------------------------
procedure Set_Data (Ctx : in out Context;
Key : in Data_Key;
Content : in Data_Access) is
Pos : constant Data_Map.Cursor := Ctx.Data.Find (Key);
begin
if Data_Map.Has_Element (Pos) then
declare
Old : Data_Access := Data_Map.Element (Pos);
begin
if Old = Content then
return;
end if;
Old.Finalize;
Free (Old);
end;
Ctx.Data.Replace_Element (Position => Pos, New_Item => Content);
else
Ctx.Data.Insert (Key => Key, New_Item => Content);
end if;
end Set_Data;
-- ------------------------------
-- Free the context data.
-- ------------------------------
overriding
procedure Finalize (Ctx : in out Context) is
Pos : Data_Map.Cursor;
Content : Data_Access;
begin
loop
Pos := Ctx.Data.First;
exit when not Data_Map.Has_Element (Pos);
Content := Data_Map.Element (Pos);
Content.Finalize;
Free (Content);
Ctx.Data.Delete (Pos);
end loop;
end Finalize;
end Util.Serialize.Contexts;
|