root / pykota / trunk / pykota / accounter.py @ 2237

Revision 2147, 3.6 kB (checked in by jerome, 20 years ago)

Removed all references to $Log$

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
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1# PyKota
2# -*- coding: ISO-8859-15 -*-
3#
4# PyKota : Print Quotas for CUPS and LPRng
5#
6# (c) 2003-2004 Jerome Alet <alet@librelogiciel.com>
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation; either version 2 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program; if not, write to the Free Software
19# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
20#
21# $Id$
22#
23#
24
25import sys
26
27class PyKotaAccounterError(Exception):
28    """An exception for Accounter related stuff."""
29    def __init__(self, message = ""):
30        self.message = message
31        Exception.__init__(self, message)
32    def __repr__(self):
33        return self.message
34    __str__ = __repr__
35   
36class AccounterBase :   
37    """A class to account print usage by querying printers."""
38    def __init__(self, kotafilter, arguments) :
39        """Sets instance vars depending on the current printer."""
40        self.filter = kotafilter
41        self.arguments = arguments
42        self.onerror = self.filter.config.getPrinterOnAccounterError(self.filter.printername)
43        self.isSoftware = 1 # by default software accounting
44       
45    def getLastPageCounter(self) :   
46        """Returns last internal page counter value (possibly faked)."""
47        try :
48            return self.LastPageCounter or 0
49        except :   
50            return 0
51           
52    def beginJob(self, printer) :   
53        """Saves the computed job size."""
54        # computes job's size
55        self.JobSize = self.computeJobSize()
56        if ((self.filter.printingsystem == "CUPS") \
57            and (self.filter.preserveinputfile is not None)) \
58            or (self.filter.printingsystem != "CUPS") :
59            self.JobSize *= self.filter.copies
60       
61        # get last job information for this printer
62        if not printer.LastJob.Exists :
63            # The printer hasn't been used yet, from PyKota's point of view
64            self.LastPageCounter = 0
65        else :   
66            # get last job size and page counter from Quota Storage
67            # Last lifetime page counter before actual job is
68            # last page counter + last job size
69            self.LastPageCounter = int(printer.LastJob.PrinterPageCounter or 0) + int(printer.LastJob.JobSize or 0)
70       
71    def fakeBeginJob(self) :   
72        """Do nothing."""
73        pass
74       
75    def endJob(self, printer) :   
76        """Do nothing."""
77        pass
78       
79    def getJobSize(self, printer) :   
80        """Returns the actual job size."""
81        try :
82            return self.JobSize
83        except AttributeError :   
84            return 0
85       
86    def computeJobSize(self) :   
87        """Must be overriden in children classes."""
88        raise RuntimeError, "AccounterBase.computeJobSize() must be overriden !"
89       
90def openAccounter(kotafilter) :
91    """Returns a connection handle to the appropriate accounter."""
92    (backend, args) = kotafilter.config.getAccounterBackend(kotafilter.printername)
93    try :
94        exec "from pykota.accounters import %s as accounterbackend" % backend.lower()
95    except ImportError :
96        raise PyKotaAccounterError, _("Unsupported accounter backend %s") % backend
97    else :   
98        return accounterbackend.Accounter(kotafilter, args)
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