data-transport/transport/common.py

"""
Data Transport - 1.0
Steve L. Nyemba, The Phi Technology LLC

This module is designed to serve as a wrapper to a set of supported data stores :
    - couchdb
    - mongodb
    - Files (character delimited)
			for xchar in delim:
		
	def split (self,row):
		"""
			This function performs a split of a record and tries to attempt to preserve the integrity of the data within i.e accounting for the double quotes.
			@pre : self.xchar is not None
		""" 

		pattern = "".join(["(?:^|",self.xchar,")(\"(?:[^\"]+|\"\")*\"|[^",self.xchar,"]*)"])
		return re.findall(pattern,row.replace('\n',''))


class Writer:
	
	def format(self,row,xchar):
		if xchar is not None and isinstance(row,list):
			return xchar.join(row)+'\n'
		elif xchar is None and isinstance(row,dict):
			row = json.dumps(row)
		return row
	"""
		It is important to be able to archive data so as to insure that growth is controlled
		Nothing in nature grows indefinitely neither should data being handled.
	"""
	def archive(self):
		pass
	def flush(self):
		pass

# class factory :
# 	@staticmethod
# 	def instance(**args):
# 		"""
# 		This class will create an instance of a transport when providing 
# 		:type	name of the type we are trying to create
# 		:args	The arguments needed to create the instance
# 		"""
# 		source = args['type']		
# 		params = args['args']
# 		anObject = None
		
# 		if source in ['HttpRequestReader','HttpSessionWriter']:
# 			#
# 			# @TODO: Make sure objects are serializable, be smart about them !!
# 			#
# 			aClassName = ''.join([source,'(**params)'])


# 		else:
			
# 			stream = json.dumps(params)
# 			aClassName = ''.join([source,'(**',stream,')'])
# 		try:
# 			anObject = eval( aClassName)
# 			#setattr(anObject,'name',source)
# 		except Exception,e:
# 			print ['Error ',e]
# 		return anObject