X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/fd72cdf2795d8f1a2681479c375bfb6efad111cd..ba3be778c450d4f8d743bf395c0c2f7a88bf804d:/models/nodes.py

diff --git a/models/nodes.py b/models/nodes.py
index 6bdc85d..2bfb4fd 100644
--- a/models/nodes.py
+++ b/models/nodes.py
@@ -1,48 +1,167 @@
 from django.db import models
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.contenttypes import generic
+from django.contrib.sites.models import Site
 from django.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect
+from django.core.exceptions import ViewDoesNotExist
 from django.core.servers.basehttp import FileWrapper
-from philo.models.base import InheritableTreeEntity
+from django.core.urlresolvers import resolve, clear_url_caches, reverse, NoReverseMatch
+from django.template import add_to_builtins as register_templatetags
+from inspect import getargspec
+from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED
+from philo.models.base import TreeEntity, Entity, QuerySetMapper, register_value_model
+from philo.utils import ContentTypeSubclassLimiter
 from philo.validators import RedirectValidator
+from philo.exceptions import ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths, AncestorDoesNotExist
+from philo.signals import view_about_to_render, view_finished_rendering
 
 
-class Node(InheritableTreeEntity):
-	accepts_subpath = False
+_view_content_type_limiter = ContentTypeSubclassLimiter(None)
+
+
+class Node(TreeEntity):
+	view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter)
+	view_object_id = models.PositiveIntegerField()
+	view = generic.GenericForeignKey('view_content_type', 'view_object_id')
+	
+	@property
+	def accepts_subpath(self):
+		if self.view:
+			return self.view.accepts_subpath
+		return False
+	
+	def render_to_response(self, request, extra_context=None):
+		return self.view.render_to_response(request, extra_context)
 	
-	def render_to_response(self, request, path=None, subpath=None):
-		return HttpResponseServerError()
+	def get_absolute_url(self):
+		try:
+			root = Site.objects.get_current().root_node
+		except Site.DoesNotExist:
+			root = None
 		
+		try:
+			path = self.get_path(root=root)
+			if path:
+				path += '/'
+			root_url = reverse('philo-root')
+			return '%s%s' % (root_url, path)
+		except AncestorDoesNotExist, ViewDoesNotExist:
+			return None
+	
 	class Meta:
-		unique_together = (('parent', 'slug'),)
 		app_label = 'philo'
 
 
-class MultiNode(Node):
+# the following line enables the selection of a node as the root for a given django.contrib.sites Site object
+models.ForeignKey(Node, related_name='sites', null=True, blank=True).contribute_to_class(Site, 'root_node')
+
+
+class View(Entity):
+	nodes = generic.GenericRelation(Node, content_type_field='view_content_type', object_id_field='view_object_id')
+	
+	accepts_subpath = False
+	
+	def get_subpath(self, obj):
+		if not self.accepts_subpath:
+			raise ViewDoesNotProvideSubpaths
+		
+		view_name, args, kwargs = self.get_reverse_params(obj)
+		try:
+			return reverse(view_name, args=args, kwargs=kwargs, urlconf=self)
+		except NoReverseMatch:
+			raise ViewCanNotProvideSubpath
+	
+	def get_reverse_params(self, obj):
+		"""This method should return a view_name, args, kwargs tuple suitable for reversing a url for the given obj using self as the urlconf."""
+		raise NotImplementedError("View subclasses must implement get_reverse_params to support subpaths.")
+	
+	def attributes_with_node(self, node):
+		return QuerySetMapper(self.attribute_set, passthrough=node.attributes)
+	
+	def render_to_response(self, request, extra_context=None):
+		if not hasattr(request, 'node'):
+			raise MIDDLEWARE_NOT_CONFIGURED
+		
+		extra_context = extra_context or {}
+		view_about_to_render.send(sender=self, request=request, extra_context=extra_context)
+		response = self.actually_render_to_response(request, extra_context)
+		view_finished_rendering.send(sender=self, response=response)
+		return response
+	
+	def actually_render_to_response(self, request, extra_context=None):
+		raise NotImplementedError('View subclasses must implement render_to_response.')
+	
+	class Meta:
+		abstract = True
+
+
+_view_content_type_limiter.cls = View
+
+
+class MultiView(View):
 	accepts_subpath = True
 	
-	urlpatterns = []
+	@property
+	def urlpatterns(self, obj):
+		raise NotImplementedError("MultiView subclasses must implement urlpatterns.")
 	
-	def render_to_response(self, request, path=None, subpath=None):
+	def actually_render_to_response(self, request, extra_context=None):
+		clear_url_caches()
+		subpath = request.node.subpath
 		if not subpath:
 			subpath = ""
 		subpath = "/" + subpath
-		from django.core.urlresolvers import resolve
 		view, args, kwargs = resolve(subpath, urlconf=self)
+		view_args = getargspec(view)
+		if extra_context is not None and ('extra_context' in view_args[0] or view_args[2] is not None):
+			if 'extra_context' in kwargs:
+				extra_context.update(kwargs['extra_context'])
+			kwargs['extra_context'] = extra_context
 		return view(request, *args, **kwargs)
 	
+	def reverse(self, view_name, args=None, kwargs=None, node=None):
+		"""Shortcut method to handle the common pattern of getting the absolute url for a multiview's
+		subpaths."""
+		subpath = reverse(view_name, urlconf=self, args=args or [], kwargs=kwargs or {})
+		if node is not None:
+			return '/%s/%s/' % (node.get_absolute_url().strip('/'), subpath.strip('/'))
+		return subpath
+	
+	def get_context(self):
+		"""Hook for providing instance-specific context - such as the value of a Field - to all views."""
+		return {}
+	
+	def basic_view(self, view_name):
+		"""
+		Wraps a field name and returns a simple view function that will render that view
+		with a basic context. This assumes that the field name is a ForeignKey to a
+		model with a render_to_response method.
+		"""
+		field = self._meta.get_field(view_name)
+		view = getattr(self, field.name, None)
+		
+		def inner(request, extra_context=None, **kwargs):
+			if not view:
+				raise Http404
+			context = self.get_context()
+			context.update(extra_context or {})
+			return view.render_to_response(request, extra_context=context)
+		
+		return inner
+	
 	class Meta:
 		abstract = True
-		app_label = 'philo'
 
 
-class Redirect(Node):
+class Redirect(View):
 	STATUS_CODES = (
 		(302, 'Temporary'),
 		(301, 'Permanent'),
 	)
-	target = models.CharField(max_length=200,validators=[RedirectValidator()])
+	target = models.CharField(max_length=200, validators=[RedirectValidator()])
 	status_code = models.IntegerField(choices=STATUS_CODES, default=302, verbose_name='redirect type')
 	
-	def render_to_response(self, request, path=None, subpath=None):
+	def actually_render_to_response(self, request, extra_context=None):
 		response = HttpResponseRedirect(self.target)
 		response.status_code = self.status_code
 		return response
@@ -51,16 +170,25 @@ class Redirect(Node):
 		app_label = 'philo'
 
 
-class File(Node):
+# Why does this exist?
+class File(View):
 	""" For storing arbitrary files """
+	
 	mimetype = models.CharField(max_length=255)
 	file = models.FileField(upload_to='philo/files/%Y/%m/%d')
 	
-	def render_to_response(self, request, path=None, subpath=None):
+	def actually_render_to_response(self, request, extra_context=None):
 		wrapper = FileWrapper(self.file)
 		response = HttpResponse(wrapper, content_type=self.mimetype)
 		response['Content-Length'] = self.file.size
 		return response
 	
 	class Meta:
-		app_label = 'philo'
\ No newline at end of file
+		app_label = 'philo'
+	
+	def __unicode__(self):
+		return self.file.name
+
+
+register_templatetags('philo.templatetags.nodes')
+register_value_model(Node)
\ No newline at end of file