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#!/usr/bin/env python
# $Id: $
from elementtree.ElementTree import XML
class FileBacked(object):
'''This object caches file data in memory.
HandleEvent is called whenever fam registers an event.
Index can parse the data into member data as required.'''
def __init__(self, name):
self.name = name
self.HandleEvent()
def HandleEvent(self, event=None):
self.data = file(self.name).read()
self.Index()
def Index(self):
pass
class DirectoryBacked(object):
__child__ = FileBacked
def __init__(self, name, fam):
self.name = name
self.fam = fam
self.entries = {}
self.inventory = False
fam.AddMonitor(name, self)
def __getitem__(self, key):
return self.entries[key]
def __iter__(self):
return self.entries.iteritems()
def AddEntry(self, name):
if self.entries.has_key(name):
print "got multiple adds"
else:
self.entries[name] = self.__child__('%s/%s'%(self.name, name))
self.entries[name].HandleEvent()
def HandleEvent(self, event):
action = event.code2str()
if action == 'exists':
if event.filename != self.name:
self.AddEntry(event.filename)
elif action == 'created':
self.AddEntry(event.filename)
elif action == 'changed':
self.entries[event.filename].HandleEvent(event)
elif action == 'deleted':
if self.entries.has_key(event.filename):
del self.entries[event.filename]
elif action in ['endExist']:
pass
else:
print "Got unknown event %s %s %s"%(event.requestID, event.code2str(), event.filename)
class XMLFileBacked(FileBacked):
__identifier__ = 'name'
def Index(self):
a = XML(self.data)
self.label = a.attrib[self.__identifier__]
self.entries = a.getchildren()
def __iter__(self):
return iter(self.entries)
class SingleXMLFileBacked(XMLFileBacked):
def __init__(self,filename,fam):
XMLFileBacked.__init__(self, filename)
fam.AddMonitor(filename, self)
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