old_contents: # Copyright (c) 2003-2005 Maxim Sobolev. All rights reserved.
  # Copyright (c) 2006-2014 Sippy Software, Inc. All rights reserved.
  #
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without modification,
  # are permitted provided that the following conditions are met:
  #
  # 1. Redistributions of source code must retain the above copyright notice, this
  # list of conditions and the following disclaimer.
  #
  # 2. Redistributions in binary form must reproduce the above copyright notice,
  # this list of conditions and the following disclaimer in the documentation and/or
  # other materials provided with the distribution.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
  # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  # ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  from SipGenericHF import SipGenericHF
  
  class SipNumericHF(SipGenericHF):
      number = None
  
      def __init__(self, body = None, number = 0):
          SipGenericHF.__init__(self, body)
          if body == None:
              self.parsed = True
              self.number = number
  
      def parse(self):
          self.number = int(self.body)
          self.parsed = True
  
      def __str__(self):
          if not self.parsed:
              return self.body
          return str(self.number)
  
      def getCopy(self):
          if not self.parsed:
              return self.__class__(body = self.body)
          return self.__class__(number = self.number)
  
      def getNum(self):
          return self.number
  
new_contents: # Copyright (c) 2003-2005 Maxim Sobolev. All rights reserved.
  # Copyright (c) 2006-2014 Sippy Software, Inc. All rights reserved.
  #
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without modification,
  # are permitted provided that the following conditions are met:
  #
  # 1. Redistributions of source code must retain the above copyright notice, this
  # list of conditions and the following disclaimer.
  #
  # 2. Redistributions in binary form must reproduce the above copyright notice,
  # this list of conditions and the following disclaimer in the documentation and/or
  # other materials provided with the distribution.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
  # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  # ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  from SipGenericHF import SipGenericHF
  
  class SipNumericHF(SipGenericHF):
      number = None
  
      def __init__(self, body = None, number = 0):
          SipGenericHF.__init__(self, body)
          if body == None:
              self.parsed = True
              self.number = number
  
      def parse(self):
          self.number = int(self.body)
          self.parsed = True
  
      def __str__(self):
          if not self.parsed:
              return self.body
          return str(self.number)
  
      def getCopy(self):
          if not self.parsed:
              return self.__class__(body = self.body)
          return self.__class__(number = self.number)
  
      def getNum(self):
          return self.number
  
      def incNum(self):
          self.number += 1
          return self.number
  
subject: Add incNum() method, so that we don't need to reinvent it in each subclass.