X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/0d51e8dc2b15ca84b8979b94a3224b4a33f7f25e..df8055d4debfd98fbd8c3ccfd40b21df063e8545:/utils.py?ds=sidebyside

diff --git a/utils.py b/utils.py
index e3d1124..6fc2cff 100644
--- a/utils.py
+++ b/utils.py
@@ -1,6 +1,105 @@
+from django.db import models
+from django.contrib.contenttypes.models import ContentType
+from django.core.paginator import Paginator, EmptyPage
+
+
+class ContentTypeLimiter(object):
+	def q_object(self):
+		return models.Q(pk__in=[])
+	
+	def add_to_query(self, query, *args, **kwargs):
+		query.add_q(self.q_object(), *args, **kwargs)
+
+
+class ContentTypeRegistryLimiter(ContentTypeLimiter):
+	def __init__(self):
+		self.classes = []
+	
+	def register_class(self, cls):
+		self.classes.append(cls)
+	
+	def unregister_class(self, cls):
+		self.classes.remove(cls)
+	
+	def q_object(self):
+		contenttype_pks = []
+		for cls in self.classes:
+			try:
+				if issubclass(cls, models.Model):
+					if not cls._meta.abstract:
+						contenttype = ContentType.objects.get_for_model(cls)
+						contenttype_pks.append(contenttype.pk)
+			except:
+				pass
+		return models.Q(pk__in=contenttype_pks)
+
+
+class ContentTypeSubclassLimiter(ContentTypeLimiter):
+	def __init__(self, cls, inclusive=False):
+		self.cls = cls
+		self.inclusive = inclusive
+	
+	def q_object(self):
+		contenttype_pks = []
+		def handle_subclasses(cls):
+			for subclass in cls.__subclasses__():
+				try:
+					if issubclass(subclass, models.Model):
+						if not subclass._meta.abstract:
+							if not self.inclusive and subclass is self.cls:
+								continue
+							contenttype = ContentType.objects.get_for_model(subclass)
+							contenttype_pks.append(contenttype.pk)
+					handle_subclasses(subclass)
+				except:
+					pass
+		handle_subclasses(self.cls)
+		return models.Q(pk__in=contenttype_pks)
+
+
 def fattr(*args, **kwargs):
 	def wrapper(function):
 		for key in kwargs:
 			setattr(function, key, kwargs[key])
 		return function
 	return wrapper
+
+
+def paginate(objects, per_page=None, page_number=1):
+	"""
+	Given a list of objects, return a (paginator, page, objects) tuple.
+	"""
+	try:
+		per_page = int(per_page)
+	except (TypeError, ValueError):
+		# Then either it wasn't set or it was set to an invalid value
+		paginator = page = None
+	else:
+		# There also shouldn't be pagination if the list is too short. Try count()
+		# first - good chance it's a queryset, where count is more efficient.
+		try:
+			if objects.count() <= per_page:
+				paginator = page = None
+		except AttributeError:
+			if len(objects) <= per_page:
+				paginator = page = None
+	
+	try:
+		return paginator, page, objects
+	except NameError:
+		pass
+	
+	paginator = Paginator(objects, per_page)
+	try:
+		page_number = int(page_number)
+	except:
+		page_number = 1
+	
+	try:
+		page = paginator.page(page_number)
+	except EmptyPage:
+		page = None
+	else:
+		objects = page.object_list
+	
+	return paginator, page, objects