231: Added Option2.get_default() method; added corresponding unit tests

ipalib/public.py

@@ -86,8 +86,13 @@ class DefaultFrom(plugable.ReadOnly):
 
 
 class Option2(plugable.ReadOnly):
-    def __init__(self, name, doc, type_, required=False, multivalue=False,
-            default=None, default_from=None, rules=tuple(), normalize=None):
+    def __init__(self, name, doc, type_,
+            required=False,
+            multivalue=False,
+            default=None,
+            default_from=None,
+            rules=tuple(),
+            normalize=None):
         self.name = check_name(name)
         self.doc = check_type(doc, str, 'doc')
         self.type = check_isinstance(type_, ipa_types.Type, 'type_')
@@ -140,6 +145,13 @@ class Option2(plugable.ReadOnly):
         else:
             self.__validate_scalar(value)
 
+    def get_default(self, **kw):
+        if self.default_from is not None:
+            default = self.default_from(**kw)
+            if default is not None:
+                return self.convert(default)
+        return self.convert(self.default)
+
 
 class Option(plugable.Plugin):
     """

ipalib/tests/test_public.py

@@ -257,6 +257,40 @@ class test_Option2(ClassChecker):
             assert e.value is fail_type
             assert e.error == 'Must be a string'
 
+    def test_get_default(self):
+        """
+        Tests the `public.Option2.get_default` method.
+        """
+        name = 'greeting'
+        doc = 'User greeting'
+        type_ = ipa_types.Unicode()
+        default = u'Hello, world!'
+        default_from = public.DefaultFrom(
+            lambda first, last: u'Hello, %s %s!' % (first, last),
+            'first', 'last'
+        )
+
+        # Scenario 1: multivalue=False
+        o = self.cls(name, doc, type_,
+            default=default,
+            default_from=default_from,
+        )
+        assert o.default is default
+        assert o.default_from is default_from
+        assert o.get_default() == default
+        assert o.get_default(first='John', last='Doe') == 'Hello, John Doe!'
+
+        # Scenario 2: multivalue=True
+        o = self.cls(name, doc, type_,
+            default=default,
+            default_from=default_from,
+            multivalue=True,
+        )
+        assert o.default is default
+        assert o.default_from is default_from
+        assert o.get_default() == (default,)
+        assert o.get_default(first='John', last='Doe') == ('Hello, John Doe!',)
+
 
 class test_Option(ClassChecker):
     """