--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/classes/@ltpda_uoh/requirements.m	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,110 @@
+% REQUIREMENTS Returns a list of LTPDA extension requirements for a given object.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% DESCRIPTION: REQUIREMENTS Returns a list of LTPDA extension requirements for a given object.
+%
+% CALL:        list = requirements(objs)
+% 
+% For multiple objects, the list will be the unique set of extension
+% modules needed to build all the input objects.
+%
+% <a href="matlab:utils.helper.displayMethodInfo('ltpda_uoh', 'requirements')">Parameters Description</a>
+%
+% VERSION:     $Id: requirements.m,v 1.2 2011/04/08 08:56:30 hewitson Exp $
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function varargout = requirements(varargin)
+
+  %%% Check if this is a call for parameters
+  if utils.helper.isinfocall(varargin{:})
+    varargout{1} = getInfo(varargin{3});
+    return
+  end
+
+  import utils.const.*
+  utils.helper.msg(msg.PROC3, 'running %s/%s', mfilename('class'), mfilename);
+
+  %%% Collect all objects with the class of the first object.
+  objs = utils.helper.collect_objects(varargin(:), '');
+
+  % recursively build a list of modules for all input objects
+  requirements = {};
+  for ii = 1:numel(objs);   
+    list = getRequirements(objs(ii).hist);    
+    requirements = [requirements list];    
+  end
+  
+  % make unique
+  requirements = unique(requirements);
+
+  if nargout == 0
+    fprintf('Requirements:\n');
+    for ll=1:numel(requirements)
+      fprintf('  %s\n', requirements{ll});
+    end
+  else
+    varargout{1} = requirements;
+  end
+end
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%                               Local Functions                               %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function list = getRequirements(h)
+  
+  list = {h.methodInfo.mpackage};
+  
+  for kk=1:numel(h.inhists)
+    list = [list getRequirements(h.inhists(kk))];
+  end  
+  
+end
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% FUNCTION:    getInfo
+%
+% DESCRIPTION: Get Info Object
+%
+% HISTORY:     10-12-2008 Diepholz
+%                Creation.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+function ii = getInfo(varargin)
+  if nargin == 1 && strcmpi(varargin{1}, 'None')
+    sets = {};
+    pl   = [];
+  else
+    sets = {'Default'};
+    pl   = getDefaultPlist;
+  end
+  % Build info object
+  ii = minfo(mfilename, 'ltpda_uoh', 'ltpda', utils.const.categories.helper, '$Id: requirements.m,v 1.2 2011/04/08 08:56:30 hewitson Exp $', sets, pl);
+  ii.setModifier(false);
+end
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% FUNCTION:    getDefaultPlist
+%
+% DESCRIPTION: Get Default Plist
+%
+% HISTORY:     10-12-2008 Diepholz
+%                Creation.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+function plout = getDefaultPlist()
+  persistent pl;  
+  if exist('pl', 'var')==0 || isempty(pl)
+    pl = buildplist();
+  end
+  plout = pl;  
+end
+
+function pl = buildplist()
+  pl = plist.EMPTY_PLIST;
+end
+