[updates] starting to extract out standalone modules

GPy/core/parameterization/updateable.py

@@ -0,0 +1,63 @@
+'''
+Created on 11 Nov 2014
+
+@author: maxz
+'''
+from observable import Observable
+
+
+class Updateable(Observable):
+    """
+    A model can be updated or not.
+    Make sure updates can be switched on and off.
+    """
+    _updates = True
+    def __init__(self, *args, **kwargs):
+        super(Updateable, self).__init__(*args, **kwargs)
+
+    @property
+    def updates(self):
+        raise DeprecationWarning("updates is now a function, see update(True|False|None)")
+
+    @updates.setter
+    def updates(self, ups):
+        raise DeprecationWarning("updates is now a function, see update(True|False|None)")
+
+    def update_model(self, updates=None):
+        """
+        Get or set, whether automatic updates are performed. When updates are
+        off, the model might be in a non-working state. To make the model work
+        turn updates on again.
+
+        :param bool|None updates:
+
+            bool: whether to do updates
+            None: get the current update state
+        """
+        if updates is None:
+            p = getattr(self, '_highest_parent_', None)
+            if p is not None:
+                self._updates = p._updates
+            return self._updates
+        assert isinstance(updates, bool), "updates are either on (True) or off (False)"
+        p = getattr(self, '_highest_parent_', None)
+        if p is not None:
+            p._updates = updates
+        self._updates = updates
+        self.trigger_update()
+
+    def toggle_update(self):
+        self.update_model(not self.update_model())
+
+    def trigger_update(self, trigger_parent=True):
+        """
+        Update the model from the current state.
+        Make sure that updates are on, otherwise this
+        method will do nothing
+
+        :param bool trigger_parent: Whether to trigger the parent, after self has updated
+        """
+        if not self.update_model() or (hasattr(self, "_in_init_") and self._in_init_):
+            #print "Warning: updates are off, updating the model will do nothing"
+            return
+        self._trigger_params_changed(trigger_parent)