From d998790c2f12594e6d0edc5a98e908677b60b31f Mon Sep 17 00:00:00 2001
From: Aldo Cortesi <aldo@nullcube.com>
Date: Wed, 17 Sep 2014 11:35:14 +1200
Subject: Clean up and clarify StateObject

- Flatten the class hierarchy
- get_state, load_state, from_state are public
- Simplify code
- Remove __eq__ and __neq__. This fundamentally changes the semantics of
inherited objects in a way that's not part of the core function of the
class
---
 libmproxy/stateobject.py | 96 ++++++++++++++----------------------------------
 1 file changed, 28 insertions(+), 68 deletions(-)

(limited to 'libmproxy/stateobject.py')

diff --git a/libmproxy/stateobject.py b/libmproxy/stateobject.py
index 9e9d6088..37b72c7e 100644
--- a/libmproxy/stateobject.py
+++ b/libmproxy/stateobject.py
@@ -2,82 +2,42 @@ from __future__ import absolute_import
 
 
 class StateObject(object):
-    def _get_state(self):
-        raise NotImplementedError  # pragma: nocover
-
-    def _load_state(self, state):
-        raise NotImplementedError  # pragma: nocover
-
-    @classmethod
-    def _from_state(cls, state):
-        raise NotImplementedError  # pragma: nocover
-        # Usually, this function roughly equals to the following code:
-        # f = cls()
-        # f._load_state(state)
-        # return f
-
-    def __eq__(self, other):
-        try:
-            return self._get_state() == other._get_state()
-        except AttributeError:
-            # we may compare with something that's not a StateObject
-            return False
-
-    def __ne__(self, other):
-        return not self.__eq__(other)
-
-
-class SimpleStateObject(StateObject):
     """
-    A StateObject with opionated conventions that tries to keep everything DRY.
+        An object with serializable state.
 
-    Simply put, you agree on a list of attributes and their type. Attributes can
-    either be primitive types(str, tuple, bool, ...) or StateObject instances
-    themselves. SimpleStateObject uses this information for the default
-    _get_state(), _from_state(s) and _load_state(s) methods. Overriding
-    _get_state or _load_state to add custom adjustments is always possible.
+        State attributes can either be serializable types(str, tuple, bool, ...)
+        or StateObject instances themselves.
     """
-
-    _stateobject_attributes = None  # none by default to raise an exception if definition was forgotten
-    """
-    An attribute-name -> class-or-type dict containing all attributes that
-    should be serialized If the attribute is a class, this class must be a
-    subclass of StateObject.
-    """
-
-    def _get_state(self):
-        return {attr: self._get_state_attr(attr, cls)
-                for attr, cls in self._stateobject_attributes.iteritems()}
+    # An attribute-name -> class-or-type dict containing all attributes that
+    # should be serialized. If the attribute is a class, it must be a subclass
+    # of StateObject.
+    _stateobject_attributes = None
 
     def _get_state_attr(self, attr, cls):
-        """
-        helper for _get_state.
-        returns the value of the given attribute
-        """
         val = getattr(self, attr)
-        if hasattr(val, "_get_state"):
-            return val._get_state()
+        if hasattr(val, "get_state"):
+            return val.get_state()
         else:
             return val
 
-    def _load_state(self, state):
-        for attr, cls in self._stateobject_attributes.iteritems():
-            self._load_state_attr(attr, cls, state)
-
-    def _load_state_attr(self, attr, cls, state):
-        """
-        helper for _load_state.
-        loads the given attribute from the state.
-        """
-        if state.get(attr, None) is None:
-            setattr(self, attr, None)
-            return
+    def from_state(self):
+        raise NotImplementedError
 
-        curr = getattr(self, attr)
-        if hasattr(curr, "_load_state"):
-            curr._load_state(state[attr])
-        elif hasattr(cls, "_from_state"):
-            setattr(self, attr, cls._from_state(state[attr]))
-        else:
-            setattr(self, attr, cls(state[attr]))
+    def get_state(self):
+        state = {}
+        for attr, cls in self._stateobject_attributes.iteritems():
+            state[attr] = self._get_state_attr(attr, cls)
+        return state
 
+    def load_state(self, state):
+        for attr, cls in self._stateobject_attributes.iteritems():
+            if state.get(attr, None) is None:
+                setattr(self, attr, None)
+            else:
+                curr = getattr(self, attr)
+                if hasattr(curr, "load_state"):
+                    curr.load_state(state[attr])
+                elif hasattr(cls, "from_state"):
+                    setattr(self, attr, cls.from_state(state[attr]))
+                else:
+                    setattr(self, attr, cls(state[attr]))
-- 
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