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(* arch-tag: AnyDBM module for on-disk string tables
Copyright (C) 2004 John Goerzen <jgoerzen@complete.org>
This program 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 program 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 program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
open AnyDBM;;
open AnyDBMUtils;;
open Hashtbl;;
open Hashtblutil;;
class dbm filename flag mode =
object(self)
inherit AnyDBMUtils.anyDBM_Base flag
val mainhash = begin
if flag.read then begin
let openflags = Open_text :: (flags_new_to_open flag Open_rdonly) in
let fd = open_in_gen openflags mode filename in
let hash = ichan_to_strhash fd in
close_in fd;
hash
end else
create 5
end
method private do_close =
if flag.write then begin
let openflags = Open_text :: (flags_new_to_open flag Open_wronly) in
let fd = open_out_gen openflags mode filename in
strhash_to_ochan mainhash fd;
close_out fd
end
method private do_add key value =
if mem mainhash key then
raise (Dbm_error "Entry already exists")
else
add mainhash key value
method private do_find key =
find mainhash key
method private do_replace key value =
replace mainhash key value
method private do_remove key =
remove mainhash key
method private do_iter func =
iter func mainhash
end;;
let opendbm filename flag mode =
new dbm filename (flags_old_to_new flag) mode;;
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