File : adagio-upload-resource-tth.adb


------------------------------------------------------------------------------

--                         ADAGIO - ADALID - AENEA.                         --

--                                                                          --

--                            Copyright (C) 2003                            --

--                                 A. Mosteo.                               --

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--  Authors: A. Mosteo. (adagio@mosteo.com)                                 --

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--  $Id: adagio-upload-resource-tth.adb,v 1.4 2004/01/29 21:47:10 Jano Exp $


--  Uploadable resources.


with Adagio.Library;
with Sha1;

with Ada.Unchecked_deallocation;

package body Adagio.Upload.Resource.TTH is

   procedure Free is new Unchecked_deallocation (
      MSU.Stream_type, MSU.Stream_access);

   ------------------------------------------------------------------------

   -- Create                                                             --

   ------------------------------------------------------------------------

   -- Creation

   function Create (Target : in Adagio.File.Object) return Object_access is
      O : Object_access := new Object;
   begin
      O.File   := Target;
      Library.Object.Export_TTH (Target, O.Data);
      O.Source := new MSU.Stream_type (O.Data);
      return O;
   end Create;

   ------------------------------------------------------------------------

   -- Id                                                                 --

   ------------------------------------------------------------------------

   -- Unique id for the resource, will identify it in queues.

   function Id (This : in Object) return String is
   begin
      return "urn:sha1:" & 
         Sha1.To_base32 (Adagio.File.Sha (This.File));
   end Id;

   ------------------------------------------------------------------------

   -- Set_position                                                       --

   ------------------------------------------------------------------------

   -- Set the starting position for its data. Call it before Stream.

   procedure Set_position (This : in out Object; Position : in Natural) is
   begin
      MSU.Set_index (
         This.Source.all, 
         Streams.Stream_element_offset (Position));
   end Set_position;

   ------------------------------------------------------------------------

   -- Stream                                                             --

   ------------------------------------------------------------------------

   -- Get an stream for the resource binary data

   procedure Stream (This : in out Object; Result : out Stream_access) is
   begin
      Result := Stream_access (This.Source);
   end Stream;

   ------------------------------------------------------------------------

   -- Content_type                                                       --

   ------------------------------------------------------------------------

   -- Get the corresponding Content-Type: http header for the resource.

   function Content_type (This : in Object) return String is
      pragma Unreferenced (This);
   begin
      return "application/tigertree-breadthfirst";
   end Content_type;
      
   ------------------------------------------------------------------------

   -- Name                                                               --

   ------------------------------------------------------------------------

   -- Descriptive name of the resource.

   function Name (This : in Object) return String is
   begin
      return "TTH of " & Adagio.File.Name (This.File);
   end Name;

   ------------------------------------------------------------------------

   -- Size                                                               --

   ------------------------------------------------------------------------

   -- Size in bytes of the resource.

   function Size (This : in Object) return Natural is
   begin
      return Natural (This.Data'Length);
   end Size;

   ------------------------------------------------------------------------

   -- Qualify                                                            --

   ------------------------------------------------------------------------

   -- Say if a resource qualifies according a criteria string:

   function Qualify (This : in Object; Criteria : in String) return Boolean is
      pragma Unreferenced (This);
      pragma Unreferenced (Criteria);
   begin
      return true;
   end Qualify;

   ------------------------------------------------------------------------

   -- Finalize                                                           --

   ------------------------------------------------------------------------

   procedure Finalize (This : in out Object) is
   begin 
      Free (This.Source);
      Adagio.Streams.Free (This.Data);
   end Finalize;

end Adagio.Upload.Resource.TTH;