Squashed 'modules/libjuju/' content from commit c50c361
git-subtree-dir: modules/libjuju
git-subtree-split: c50c361a8b9a3bbf1a33f5659e492b481f065cd2
diff --git a/juju/delta.py b/juju/delta.py
new file mode 100644
index 0000000..b1eba23
--- /dev/null
+++ b/juju/delta.py
@@ -0,0 +1,79 @@
+from .client import client
+
+
+def get_entity_delta(d):
+ return _delta_types[d.entity](d.deltas)
+
+
+def get_entity_class(entity_type):
+ return _delta_types[entity_type].get_entity_class()
+
+
+class EntityDelta(client.Delta):
+ def get_id(self):
+ return self.data['id']
+
+ @classmethod
+ def get_entity_class(self):
+ return None
+
+
+class ActionDelta(EntityDelta):
+ @classmethod
+ def get_entity_class(self):
+ from .action import Action
+ return Action
+
+
+class ApplicationDelta(EntityDelta):
+ def get_id(self):
+ return self.data['name']
+
+ @classmethod
+ def get_entity_class(self):
+ from .application import Application
+ return Application
+
+
+class AnnotationDelta(EntityDelta):
+ def get_id(self):
+ return self.data['tag']
+
+ @classmethod
+ def get_entity_class(self):
+ from .annotation import Annotation
+ return Annotation
+
+
+class MachineDelta(EntityDelta):
+ @classmethod
+ def get_entity_class(self):
+ from .machine import Machine
+ return Machine
+
+
+class UnitDelta(EntityDelta):
+ def get_id(self):
+ return self.data['name']
+
+ @classmethod
+ def get_entity_class(self):
+ from .unit import Unit
+ return Unit
+
+
+class RelationDelta(EntityDelta):
+ @classmethod
+ def get_entity_class(self):
+ from .relation import Relation
+ return Relation
+
+
+_delta_types = {
+ 'action': ActionDelta,
+ 'application': ApplicationDelta,
+ 'annotation': AnnotationDelta,
+ 'machine': MachineDelta,
+ 'unit': UnitDelta,
+ 'relation': RelationDelta,
+}