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#!/usr/bin/env python 

# 

# LSST Data Management System 

# Copyright 2008-2016 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

 

from __future__ import print_function 

from builtins import object 

from lsst.ctrl.execute import envString 

import os.path 

 

 

class SeqFile(object): 

"""Class which can read and increment files used to store sequence numbers 

""" 

 

def __init__(self, seqFileName): 

"""Constructor 

@param seqFileName file name to operate on 

""" 

self.fileName = envString.resolve(seqFileName) 

 

def nextSeq(self): 

"""Produce the next sequence number. 

@return a sequence number 

""" 

seq = 0 

if not os.path.exists(self.fileName): 

self.writeSeq(seq) 

else: 

seq = self.readSeq() 

seq += 1 

self.writeSeq(seq) 

return seq 

 

def readSeq(self): 

"""Read a sequence number 

@return a sequence number 

""" 

with open(self.fileName) as seqFile: 

line = seqFile.read() 

seq = int(line) 

seqFile.close() 

return seq 

 

def writeSeq(self, seq): 

"""Write a sequence number 

""" 

with open(self.fileName, 'w') as seqFile: 

print(seq, file=seqFile) 

seqFile.close()