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## Copyright (C) 2010-2013 Ben Abbott
##
## This file is part of Octave.
##
## Octave 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 3 of the License, or
## (at your option) any later version.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{value} =} getappdata (@var{h}, @var{name})
## @deftypefnx {Function File} {@var{appdata} =} getappdata (@var{h})
##
## Return the @var{value} for named application data for the object(s) with
## handle(s) @var{h}.
##
## @code{getappdata(@var{h})} returns a structure, @var{appdata}, whose fields
## correspond to the appdata properties.
##
## @seealso{setappdata, guidata, get, set, getpref, setpref}
## @end deftypefn
## Author: Ben Abbott <bpabbott@mac.com>
## Created: 2010-07-15
function val = getappdata (h, name)
if (all (ishandle (h)) && nargin == 2 && ischar (name))
## FIXME - Is there a better way to handle non-existent appdata
## and missing fields?
val = cell (numel (h), 1);
appdata = struct ();
for nh = 1:numel (h)
try
appdata = get (h(nh), "__appdata__");
end_try_catch
if (! isfield (appdata, name))
appdata.(name) = [];
endif
val(nh) = {appdata.(name)};
endfor
if (nh == 1)
val = val{1};
endif
elseif (ishandle (h) && numel (h) == 1 && nargin == 1)
try
val = get (h, "__appdata__");
catch
val = struct ();
end_try_catch
else
error ("getappdata: invalid input");
endif
endfunction
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