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import gc
#==================================================================================
class SumList:
def __init__(self, name, children, size):
self.name = name
self.children = children
if self.children is None: self.children = []
self.size = size
def append_child(self, sumlist):
self.children.append(sumlist)
self.size += sumlist.size
def has_children(self):
if len(self.children) > 0: return True
return False
def printout(self, tab=0 ):
print " "*tab,"%s (%i)"%(sumlist.name,sumlist.size)
if not sumlist.children: return
if tab > 1: return
for e in sumlist.children:
e.printout(tab+1)
def sort(self):
self.children.sort(self.__cmp_fn)
def sort_by_size(self):
self.children.sort(self.__cmp_by_size)
def __cmp_by_size(self, b, a ):
return cmp(a[2], b[2]) # compare sizes
def __cmp_fn(self, b, a ):
""" a and b are tuples describing a directory tree. Compare first by directory
status, then by size, and finally by name. """
a_dir = a[1] != None
b_dir = b[1] != None
if a_dir and not b_dir:
return 1
elif b_dir and not a_dir:
return -1
elif a_dir and b_dir:
return cmp(a[2], b[2]) # compare sizes
else:
return cmp(a[0], b[0]) # compare names
def __getitem__(self, key):
if key == 0: return self.name
if key == 1: return self.children
if key == 2: return self.size
def __len__(self):
return 3
#==================================================================================
class SumListCollection:
""" A repository for folder data.
Is filled by the walker, and retrieved by the UI class.
An int is used to track changes in a path.
Since sumlists are objects, python will store references to them instead
of copying the data (as it would with tuples).
"""
def __init__(self):
self.clear()
def set_sumlist(self, uri, sumlist):
if not isinstance(sumlist,SumList): raise ValueError
if not isinstance(uri,unicode): raise ValueError
if not sumlist.has_children(): return # skip files
self.collection[uri] = sumlist
if uri in self.versionControl:
self.versionControl[uri] += 1
else:
self.versionControl[uri] = 0
def get_sumlist(self, uri):
if uri in self.collection:
return self.collection[uri]
def has_changed(self, uri, version):
if uri in self.versionControl:
if version != self.versionControl[uri]:
return True
return False
def clear(self):
self.collection = {}
self.versionControl = {}
gc.collect()
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