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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._callbacks = {}
self.Open(progress)
def _runCallbacks(self, name):
if self._callbacks.has_key(name):
for callback in self._callbacks[name]:
apply(callback)
def Open(self, progress):
self._runCallbacks("cache_pre_open")
self._cache = apt_pkg.GetCache(progress)
self._depcache = apt_pkg.GetDepCache(self._cache)
self._records = apt_pkg.GetPkgRecords(self._cache)
self._dict = {}
# 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()
self._runCallbacks("cache_post_open")
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.CachePreChange()
self._depcache.Upgrade(DistUpgrade)
self.CachePostChange()
def Commit(self, fprogress, iprogress):
self._depcache.Commit(fprogress, iprogress)
# cache changes
def CachePostChange(self):
" called internally if the cache has changed, emit a signal then "
self._runCallbacks("cache_post_change")
def CachePreChange(self):
""" called internally if the cache is about to change, emit
a signal then """
self._runCallbacks("cache_pre_change")
def connect(self, name, callback):
""" connect to a signal, currently only used for
cache_{post,pre}_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(object):
""" a cache that if filtered, can work on a existing cache or create
a new one """
def __init__(self, cache=None, progress=None):
if cache == None:
self.cache = Cache(progress)
else:
self.cache = cache
self.cache.connect("cache_post_change", self.FilterCachePostChange)
self.cache.connect("cache_post_open", self.FilterCachePostChange)
self._filtered = {}
self._filters = []
def __len__(self):
return len(self._filtered)
def __getitem__(self, key):
return self.cache._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):
" internal helper to refilter "
self._filtered = {}
for pkg in self.cache._dict.keys():
for f in self._filters:
if f.apply(self.cache._dict[pkg]):
self._filtered[pkg] = 1
break
def SetFilter(self, filter):
" set the current active filter "
self._filters = []
self._filters.append(filter)
#self._reapplyFilter()
# force a cache-change event that will result in a refiltering
self.cache.CachePostChange()
def FilterCachePostChange(self):
" called internally if the cache changes, emit a signal then "
#print "FilterCachePostChange()"
self._reapplyFilter()
# def connect(self, name, callback):
# self.cache.connect(name, callback)
def __getattr__(self, key):
" we try to look exactly like a real cache "
#print "getattr: %s " % key
if self.__dict__.has_key(key):
return self.__dict__[key]
else:
return getattr(self.cache, key)
def cache_pre_changed():
print "cache pre changed"
def cache_post_changed():
print "cache post changed"
if __name__ == "__main__":
print "Cache self test"
apt_pkg.init()
c = Cache(OpTextProgress())
c.connect("cache_pre_change", cache_pre_changed)
c.connect("cache_post_change", cache_post_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 (argument is old cache)"
f = FilteredCache(c)
f.cache.connect("cache_pre_change", cache_pre_changed)
f.cache.connect("cache_post_change", cache_post_changed)
f.cache.Upgrade()
f.SetFilter(MarkedChangesFilter())
print len(f)
for pkg in f.keys():
#print c[pkg].Name()
x = f[pkg].Name()
print len(f)
print "Testing filtered cache (no argument)"
f = FilteredCache(progress=OpTextProgress())
f.cache.connect("cache_pre_change", cache_pre_changed)
f.cache.connect("cache_post_change", cache_post_changed)
f.cache.Upgrade()
f.SetFilter(MarkedChangesFilter())
print len(f)
for pkg in f.keys():
#print c[pkg].Name()
x = f[pkg].Name()
print len(f)
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