82 lines
1.8 KiB
Python
82 lines
1.8 KiB
Python
import os
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from .__init__ import Reader,Writer
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import json
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class DiskReader(Reader) :
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"""
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This class is designed to read data from disk (location on hard drive)
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@pre : isready() == True
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"""
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def __init__(self,**params):
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"""
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@param path absolute path of the file to be read
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"""
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Reader.__init__(self)
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self.path = params['path'] ;
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def isready(self):
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return os.path.exists(self.path)
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def read(self,size=-1):
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"""
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This function reads the rows from a designated location on disk
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@param size number of rows to be read, -1 suggests all rows
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"""
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f = open(self.path,'rU')
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i = 1
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for row in f:
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i += 1
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if size == i:
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break
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yield row
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f.close()
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class DiskWriter(Writer):
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"""
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This function writes output to disk in a designated location
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"""
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def __init__(self,**params):
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if 'path' in params:
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self.path = params['path']
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else:
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self.path = None
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if 'name' in params:
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self.name = params['name'];
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else:
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self.name = None
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if os.path.exists(self.path) == False:
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os.mkdir(self.path)
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def isready(self):
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"""
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This function determines if the class is ready for execution or not
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i.e it determines if the preconditions of met prior execution
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"""
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p = self.path is not None and os.path.exists(self.path)
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q = self.name is not None
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return p and q
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def write(self,**params):
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"""
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This function writes a record to a designated file
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@param label <passed|broken|fixed|stats>
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@param row row to be written
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"""
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label = params['label']
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row = params['row']
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xchar = None
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if 'xchar' is not None:
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xchar = params['xchar']
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path = ''.join([self.path,os.sep,label])
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if os.path.exists(path) == False:
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os.mkdir(path) ;
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path = ''.join([path,os.sep,self.name])
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f = open(path,'a')
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row = self.format(row,xchar);
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f.write(row)
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f.close()
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