Merge pull request #67 from SpiNNakerManchester/neuron_implementation…

…_work

Neuron implementation work

spinn_utilities/classproperty.py

@@ -0,0 +1,20 @@
+class ClassPropertyDescriptor(object):
+    """ A class to handle the management of class properties
+    """
+
+    def __init__(self, fget):
+        self.fget = fget
+
+    def __get__(self, obj, klass=None):
+        if klass is None:
+            klass = type(obj)
+        return self.fget.__get__(obj, klass)()
+
+
+def classproperty(func):
+    """ Defines a property at the class-level
+    """
+    if not isinstance(func, (classmethod, staticmethod)):
+        func = classmethod(func)
+
+    return ClassPropertyDescriptor(func)

unittests/test_class_property.py

@@ -0,0 +1,30 @@
+from spinn_utilities.classproperty import classproperty
+
+
+class ClassWithClassProperty(object):
+
+    _my_property = "Test"
+    getter_called = False
+
+    @classproperty
+    def my_property(cls):
+        cls.getter_called = True
+        return cls._my_property
+
+    @classmethod
+    def set_my_property(cls, my_property):
+        cls._my_property = my_property
+
+
+def test_class_property():
+
+    assert not ClassWithClassProperty.getter_called
+    assert ClassWithClassProperty.my_property == \
+        ClassWithClassProperty._my_property
+    assert ClassWithClassProperty.getter_called
+
+    instance_1 = ClassWithClassProperty()
+    instance_2 = ClassWithClassProperty()
+    ClassWithClassProperty.set_my_property("NewValue")
+    assert instance_1.my_property == instance_2.my_property
+    assert ClassWithClassProperty.my_property == instance_1.my_property