Add the Collection class to the common app.

mayan/apps/common/classes.py

@@ -1,10 +1,48 @@
 from __future__ import unicode_literals
 
 from django.apps import apps
+from django.core.urlresolvers import reverse
 from django.db import models
 from django.utils.translation import ugettext
 
 
+class Collection(object):
+    _registry = []
+
+    @classmethod
+    def get_all(cls):
+        return sorted(cls._registry, key=lambda entry: entry._order)
+
+    def __init__(self, label, icon=None, link=None, queryset=None, model=None, order=None):
+        self._label = label
+        self._icon = icon
+        self._link = link
+        self._queryset = queryset
+        self._model = model
+        self._order = order or 99
+        self.__class__._registry.append(self)
+
+    def __unicode__(self):
+        return unicode(self.label)
+
+    def resolve(self):
+        self.children = self._get_children()
+        self.icon = self._icon
+        self.label = self._label
+        self.url = None
+        if self._link:
+            self.icon = getattr(self._link, 'icon', self._icon)
+            self.url = reverse(viewname=self._link.view, args=self._link.args)
+        return ''
+
+    def _get_children(self):
+        if self._queryset:
+            return self._queryset
+        else:
+            if self._model:
+                return self._model.objects.all()
+
+
 class DashboardWidget(object):
     _registry = []