function b = subsref(a,index)
% subsref - Defines generic indexing for objects.

% Copyright (c) 2007 Cengiz Gunay <cengique@users.sf.net>.
% This work is licensed under the Academic Free License ("AFL")
% v. 3.0. To view a copy of this license, please look at the COPYING
% file distributed with this software or visit
% http://opensource.org/licenses/afl-3.0.php.

% If a is an array, use built-in methods
if length(a) > 1
  b = builtin('subsref', a, index);
  return;
end

if size(index, 2) > 1
  first = subsref(a, index(1));
  % recursive
  b = subsref(first, index(2:end));
else
  switch index.type
    case '()'
      % Accept b = a(1), croak for everything else
      if (index.subs{1} == 1 || strcmp(index.subs{1}, ':')) && ...
              length(index.subs) > 1 && ...
              (index.subs{2} == 1 || strcmp(index.subs{2}, ':')) && ...
              length(index.subs) <= 2
	b = a;
      else
	error('indexing operator not defined.');
      end
      %b = a(index.subs{:});
    case '.'
      b = get(a, index.subs); 
    case '{}'
      b = a{index.subs{:}};
  end
end
