------------------------------------------------------------------------------
--                                                                          --
--                           POLYORB COMPONENTS                             --
--                                                                          --
--                P O L Y O R B . U T I L S . H T A B L E S                 --
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--                                 S p e c                                  --
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--         Copyright (C) 2002-2003 Free Software Foundation, Inc.           --
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-- PolyORB is free software; you  can  redistribute  it and/or modify it    --
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-- Boston, MA 02111-1307, USA.                                              --
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--                PolyORB is maintained by ACT Europe.                      --
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------------------------------------------------------------------------------

--  Parent package for Hash Tables.

package PolyORB.Utils.HTables is

   pragma Pure;

   --  Every hash table HTable on a given Item type must define
   --  the following procedures and functions.

   --     function Lookup
   --       (T           : HTable;
   --        Key         : String;
   --        Error_Value : Item)
   --        return Item;
   --     --  Find Key in hash table and return its associated Item.
   --     --  When Key does not exist, the function returns Error_Value.

   --     function Lookup
   --       (T     : HTable;
   --        Key   : String)
   --        return Item;
   --     --  Find Key in hash table and return its associated Item.
   --     --  When Key does not exist, the function raise No_Key exception.

   --     procedure Insert
   --       (T     : HTable;
   --        Key   : String;
   --        Value : Item);
   --     --  Insert (Key, Value) in hash table.
   --     --  Key is the string to hash and Value its associated Item.
   --     --  If Key already exists, nothing is done.

   --     procedure Delete
   --       (T   : HTable;
   --        Key : String);
   --     --  Delete key in hash table. In case of a non-existing Key, Delete
   --     --  ignores deletion. Key is the string to hash.

end PolyORB.Utils.HTables;
