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Source Code for Module fuzzy.set.Singleton

  1  # -*- coding: utf-8 -*- 
  2  # 
  3  # Copyright (C) 2009  Rene Liebscher 
  4  # 
  5  # This program is free software; you can redistribute it and/or modify it under 
  6  # the terms of the GNU Lesser General Public License as published by the Free  
  7  # Software Foundation; either version 3 of the License, or (at your option) any 
  8  # later version. 
  9  # 
 10  # This program is distributed in the hope that it will be useful, but WITHOUT  
 11  # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
 12  # FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 
 13  # details. 
 14  #  
 15  # You should have received a copy of the GNU Lesser General Public License 
 16  # along with this program; if not, see <http://www.gnu.org/licenses/>.  
 17  # 
 18   
 19  """This set represents a non-fuzzy number.""" 
 20   
 21  __revision__ = "$Id: Singleton.py,v 1.18 2010-10-29 19:24:41 rliebscher Exp $" 
 22   
 23   
 24  from fuzzy.set.Polygon import Polygon 
 25  from fuzzy.utils import prop 
 26  from fuzzy.Exception import FuzzyException 
 27   
 28  # use Polygon as base class so we don't need write all 
 29  # methods again 
 30 -class Singleton(Polygon): 
 31      """This set represents a non-fuzzy number. 
 32       
 33      Its membership is only for x equal 1.:: 
 34       
 35                * 
 36                | 
 37                | 
 38                | 
 39           -----+----- 
 40                x 
 41         
 42      See also U{http://pyfuzzy.sourceforge.net/demo/set/Singleton.png} 
 43      """ 
 44   
 45 -    def __init__(self, x=0.0): 
 46          super(Singleton, self).__init__() 
 47          self._x = float(x) # so it is defined and makes pychecker & Co. happy 
 48          self.x = float(x) # update polygon (_x would be defined here in any case) 
 49   
 50      # pylint: disable=E0202,E0211,W0212 
 51      @prop 
 52 -    def x(): #@NoSelf 
 53          """x 
 54          @type: float""" 
 55          def fget(self): # pylint: disable=W0612,C0111 
 56              return self._x 
 57          def fset(self, value): # pylint: disable=W0612,C0111 
 58              self._x = float(value) 
 59              self._update() 
 60          return locals() 
 61   
 62 -    def _update(self): 
 63          """update polygon""" 
 64          p = super(Singleton, self) 
 65          p.clear() 
 66          p.add(self._x, 0.0) 
 67          p.add(self._x, 1.0) 
 68          p.add(self._x, 0.0) 
 69   
 70 -    def __call__(self, x): 
 71          """Get membership of value x.""" 
 72          if x == self._x: 
 73              return 1.0 
 74          else: 
 75              return 0.0 
 76   
 77 -    def getCOG(self): 
 78          """Return center of gravity.""" 
 79          return self._x 
 80   
 81 -    def add(self, x, y, where=Polygon.END): 
 82          """Don't let anyone destroy our singleton.""" 
 83          raise FuzzyException() 
 84   
 85 -    def remove(self, x, where=Polygon.END): 
 86          """Don't let anyone destroy our singleton.""" 
 87          raise FuzzyException() 
 88   
 89 -    def clear(self): 
 90          """Don't let anyone destroy our singleton.""" 
 91          raise FuzzyException() 
 92   
 93 -    def __repr__(self): 
 94          """Return representation of instance. 
 95                      
 96             @return: representation of instance 
 97             @rtype: string 
 98             """ 
 99          return "%s.%s(x=%s)" % (self.__class__.__module__, self.__class__.__name__, self._x) 
100   

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