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import apt_pkg
from apt import Package
from apt.progress import OpTextProgress
from UserDict import UserDict
class Cache(object):
def __init__(self, progress=None):
self.Open(progress)
def Open(self, progress):
self._cache = apt_pkg.GetCache(progress)
self._depcache = apt_pkg.GetDepCache(self._cache)
self._records = apt_pkg.GetPkgRecords(self._cache)
self._dict = {}
self._callbacks = {}
# build the packages dict
if progress != None:
progress.Op = "Building data structures"
i=last=0
size=len(self._cache.Packages)
for pkg in self._cache.Packages:
if progress != None and last+100 < i:
progress.Update(i/float(size)*100)
last=i
# drop stuff with no versions (cruft)
if len(pkg.VersionList) > 0:
self._dict[pkg.Name] = Package(self._cache, self._depcache,
self._records, self, pkg)
i += 1
if progress != None:
progress.Done()
def __getitem__(self, key):
return self._dict[key]
def has_key(self, key):
try:
self._dict[key]
except KeyError:
return False
return True
def __len__(self):
return len(self._dict)
def keys(self):
return self._dict.keys()
def GetChanges(self):
changes = []
for name in self._dict.keys():
p = self._dict[name]
if p.MarkedUpgrade() or p.MarkedInstall() or p.MarkedDelete() or \
p.MarkedDowngrade() or p.MarkedReinstall():
changes.append(p)
return changes
def Upgrade(self, DistUpgrade=False):
self._depcache.Upgrade(DistUpgrade)
self.CacheChange()
def Commit(self, fprogress, iprogress):
self._depcache.Commit(fprogress, iprogress)
# cache changes
def CacheChange(self):
" called internally if the cache changes, emit a signal then "
if not self._callbacks.has_key("cache_changed"):
return
for callback in self._callbacks["cache_changed"]:
apply(callback)
def connect(self, name, callback):
" connect to a signal, currently only used for cache_changed "
if not self._callbacks.has_key(name):
self._callbacks[name] = []
self._callbacks[name].append(callback)
# ----------------------------- experimental interface
class Filter(object):
def apply(self, pkg):
return True
class MarkedChangesFilter(Filter):
def apply(self, pkg):
if pkg.MarkedInstall() or pkg.MarkedDelete() or pkg.MarkedUpgrade():
return True
else:
return False
class FilteredCache(Cache):
def __init__(self, progress=None):
Cache.__init__(self, progress)
self._filtered = {}
self._filters = []
def __len__(self):
return len(self._filtered)
def __getitem__(self, key):
return self._dict[key]
def keys(self):
return self._filtered.keys()
def has_key(self, key):
try:
self._filtered[key]
except KeyError:
return False
return True
def _reapplyFilter(self):
for pkg in self._dict.keys():
for f in self._filters:
if f.apply(self._dict[pkg]):
self._filtered[pkg] = 1
break
def SetFilter(self, filter):
self._filters = []
self._filters.append(filter)
self._reapplyFilter()
def CacheChange(self):
Cache.CacheChange(self)
" called internally if the cache changes, emit a signal then "
self._reapplyFilter()
def cache_changed():
print "cache changed"
if __name__ == "__main__":
print "Cache self test"
apt_pkg.init()
c = Cache(OpTextProgress())
c.connect("cache_changed", cache_changed)
print c.has_key("aptitude")
p = c["aptitude"]
print p.Name()
print len(c)
for pkg in c.keys():
x= c[pkg].Name()
c.Upgrade()
changes = c.GetChanges()
print len(changes)
for p in changes:
#print p.Name()
x = p.Name()
print "Testing filtered cache"
c = FilteredCache()
c.Upgrade()
c.SetFilter(MarkedChangesFilter())
print len(c)
for pkg in c.keys():
#print c[pkg].Name()
x = c[pkg].Name()
print len(c)
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