adds first quick adapter draft

src/personalisation/adapters.py

@@ -0,0 +1,55 @@
+from personalisation.models import Segment
+
+class BaseSegmentsAdapter(object):
+    """Base adapter with required functions predefined"""
+    def __init__(self):
+        return
+
+    def get(self):
+        return
+
+    def add(self):
+        return
+
+    def refresh(self):
+        return
+
+    def check_segment_exists(self):
+        return
+
+    class Meta:
+        abstract = True
+
+
+class SessionSegmentsAdapter(BaseSegmentsAdapter):
+    """Segments adapter that uses Django's SessionMiddleware to store segments"""
+    # Setup
+    def __init__(self, request):
+        self.request = request
+
+        # Set up segments dictionary object in the session
+        if 'segments' not in self.request.session:
+            self.request.session['segments'] = []
+
+    # Get segments
+    def get(self):
+        return self.request.session['segments']
+
+    # Add segments
+    def add(self, segment):
+        self.request.session['segments'].append(segment)
+
+    def refresh(self):
+        current_segments = self.request.session['segments']
+        persistent_segments = Segment.objects.filter(persistent=True)
+
+        current_segments = [item for item in current_segments if
+                            any(seg.pk for seg in persistent_segments) == item['id']]
+
+        self.request.session['segments'] = current_segments
+
+    # Quick checking logic to see if a segment exists
+    def check_segment_exists(self, segment):
+        segments = self.request.session['segments']
+
+        return any(item for item in self.request.session['segments'] if segment.pk == item.id)