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function Constraint = Constraint_create(varargin)
% Constraint = Constraint_create(level(optional), version(optional) )
%
% Takes
%
% 1. level, an integer representing an SBML level (optional)
% 2. version, an integer representing an SBML version (optional)
%
% Returns
%
% 1. a MATLAB_SBML Constraint structure of the appropriate level and version
%
% *NOTE:* the optional level and version preserve backwards compatibility
% a missing version argument will default to L1V2; L2V4 or L3V1
% missing both arguments will default to L3V1
%<!---------------------------------------------------------------------------
% This file is part of SBMLToolbox. Please visit http://sbml.org for more
% information about SBML, and the latest version of SBMLToolbox.
%
% Copyright (C) 2009-2012 jointly by the following organizations:
% 1. California Institute of Technology, Pasadena, CA, USA
% 2. EMBL European Bioinformatics Institute (EBML-EBI), Hinxton, UK
%
% Copyright (C) 2006-2008 jointly by the following organizations:
% 1. California Institute of Technology, Pasadena, CA, USA
% 2. University of Hertfordshire, Hatfield, UK
%
% Copyright (C) 2003-2005 jointly by the following organizations:
% 1. California Institute of Technology, Pasadena, CA, USA
% 2. Japan Science and Technology Agency, Japan
% 3. University of Hertfordshire, Hatfield, UK
%
% SBMLToolbox is free software; you can redistribute it and/or modify it
% under the terms of the GNU Lesser General Public License as published by
% the Free Software Foundation. A copy of the license agreement is provided
% in the file named "LICENSE.txt" included with this software distribution.
%----------------------------------------------------------------------- -->
%check the input arguments are appropriate
if (nargin > 2)
error('too many input arguments');
end;
switch (nargin)
case 2
level = varargin{1};
version = varargin{2};
case 1
level = varargin{1};
if (level == 1)
version = 2;
elseif (level == 2)
version = 4;
else
version = 1;
end;
otherwise
level = 3;
version = 1;
end;
if ~isValidLevelVersionCombination(level, version)
error('invalid level/version combination');
end;
%get fields and values and create the structure
[fieldnames, num] = getConstraintFieldnames(level, version);
if (num > 0)
values = getConstraintDefaultValues(level, version);
Constraint = cell2struct(values, fieldnames, 2);
%add level and version
Constraint.level = level;
Constraint.version = version;
%check correct structure
if ~isSBML_Constraint(Constraint, level, version)
Constraint = struct();
warning('Warn:BadStruct', 'Failed to create Constraint');
end;
else
Constraint = [];
warning('Warn:InvalidLV', 'Constraint not an element in SBML L%dV%d', level, version);
end;
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