G-Node · achilleas-k · Apr 15, 2020 · Apr 14, 2020 · Apr 14, 2020 · Apr 14, 2020
diff --git a/odml/property.py b/odml/property.py
@@ -9,6 +9,7 @@
 from . import validation
 from . import format as frmt
 from .tools.doc_inherit import inherit_docstring, allow_inherit_docstring
+from .util import format_cardinality
 
 
 def odml_tuple_import(t_count, new_value):
@@ -413,9 +414,7 @@ def values(self, new_value):
         self._values = [dtypes.get(v, self.dtype) for v in new_value]
 
         # Validate and inform user if the current values cardinality is violated
-        valid = validation.Validation(self)
-        for err in valid.errors:
-            print("%s: %s" % (err.rank.capitalize(), err.msg))
+        self._values_cardinality_validation()
 
     @property
     def value_origin(self):
@@ -528,7 +527,7 @@ def val_cardinality(self):
         """
         The value cardinality of a Property. It defines how many values
         are minimally required and how many values should be maximally
-        stored. Use 'values_set_cardinality' to set.
+        stored. Use the 'set_values_cardinality' method to set.
         """
         return self._val_cardinality
 
@@ -549,50 +548,22 @@ def val_cardinality(self, new_value):
         :param new_value: Can be either 'None', a positive integer, which will set
                           the maximum or an integer 2-tuple of the format '(min, max)'.
         """
-        invalid_input = False
-        exc_msg = "Can only assign positive single int or int-tuples of the format '(min, max)'"
-
-        # Empty values reset the cardinality to None.
-        if not new_value or new_value == (None, None):
-            self._val_cardinality = None
-
-        # Providing a single integer sets the maximum value in a tuple.
-        elif isinstance(new_value, int) and new_value > 0:
-            self._val_cardinality = (None, new_value)
-
-        # Only integer 2-tuples of the format '(min, max)' are supported to set the cardinality
-        elif isinstance(new_value, tuple) and len(new_value) == 2:
-            v_min = new_value[0]
-            v_max = new_value[1]
-
-            min_int = isinstance(v_min, int) and v_min >= 0
-            max_int = isinstance(v_max, int) and v_max >= 0
-
-            if max_int and min_int and v_max > v_min:
-                self._val_cardinality = (v_min, v_max)
-
-            elif max_int and not v_min:
-                self._val_cardinality = (None, v_max)
-
-            elif min_int and not v_max:
-                self._val_cardinality = (v_min, None)
+        self._val_cardinality = format_cardinality(new_value)
 
-            else:
-                invalid_input = True
+        # Validate and inform user if the current values cardinality is violated
+        self._values_cardinality_validation()
 
-            # Use helpful exception message in the following case:
-            if max_int and min_int and v_max < v_min:
-                exc_msg = "Minimum larger than maximum (min=%s, max=%s)" % (v_min, v_max)
-        else:
-            invalid_input = True
+    def _values_cardinality_validation(self):
+        """
+        Runs a validation to check whether the values cardinality
+        is respected and prints a warning message otherwise.
+        """
+        valid = validation.Validation(self)
 
-        if not invalid_input:
-            # Validate and inform user if the current values cardinality is violated
-            valid = validation.Validation(self)
-            for err in valid.errors:
-                print("%s: %s" % (err.rank.capitalize(), err.msg))
-        else:
-            raise ValueError(exc_msg)
+        # Make sure to display only warnings of the current property
+        res = [curr for curr in valid.errors if self.id == curr.obj.id]
+        for err in res:
+            print("%s: %s" % (err.rank.capitalize(), err.msg))
 
     def set_values_cardinality(self, min_val=None, max_val=None):
         """

diff --git a/odml/util.py b/odml/util.py
@@ -0,0 +1,63 @@
+# -*- coding: utf-8
+"""
+Module containing general utility functions.
+"""
+
+
+def format_cardinality(in_val):
+    """
+    Checks an input value and formats it towards a custom tuple format
+    used in odml Section, Property and Values cardinality.
+
+    The following cases are supported:
+    (n, n) - default, no restriction
+    (d, n) - minimally d entries, no maximum
+    (n, d) - maximally d entries, no minimum
+    (d, d) - minimally d entries, maximally d entries
+
+    Only positive integers are supported. 'None' is used to denote
+    no restrictions on a maximum or minimum.
+
+    :param in_val: Can either be 'None', a positive integer, which will set
+                   the maximum or an integer 2-tuple of the format '(min, max)'.
+
+    :returns: None or the value as tuple. A ValueError is raised, if the
+              provided value was not in an acceptable format.
+    """
+    exc_msg = "Can only assign positive single int or int-tuples of the format '(min, max)'"
+
+    # Empty values reset the cardinality to None.
+    if not in_val:
+        return None
+
+    # Catch tuple edge cases (0, 0); (None, None); (0, None); (None, 0)
+    if isinstance(in_val, (tuple, list)) and len(in_val) == 2 and not in_val[0] and not in_val[1]:
+        return None
+
+    # Providing a single integer sets the maximum value in a tuple.
+    if isinstance(in_val, int) and in_val > 0:
+        return None, in_val
+
+    # Integer 2-tuples of the format '(min, max)' are supported to set the cardinality.
+    # Also support lists with a length of 2 without advertising it.
+    if isinstance(in_val, (tuple, list)) and len(in_val) == 2:
+        v_min = in_val[0]
+        v_max = in_val[1]
+
+        min_int = isinstance(v_min, int) and v_min >= 0
+        max_int = isinstance(v_max, int) and v_max >= 0
+
+        if max_int and min_int and v_max >= v_min:
+            return v_min, v_max
+
+        if max_int and not v_min:
+            return None, v_max
+
+        if min_int and not v_max:
+            return v_min, None
+
+        # Use helpful exception message in the following case:
+        if max_int and min_int and v_max < v_min:
+            exc_msg = "Minimum larger than maximum (min=%s, max=%s)" % (v_min, v_max)
+
+    raise ValueError(exc_msg)
diff --git a/test/test_util.py b/test/test_util.py
@@ -0,0 +1,79 @@
+"""
+This file tests odml util functions.
+"""
+
+import unittest
+
+from odml.util import format_cardinality
+
+
+class TestUtil(unittest.TestCase):
+
+    def test_format_cardinality(self):
+        # Test empty set
+        self.assertIsNone(format_cardinality(None))
+        self.assertIsNone(format_cardinality([]))
+        self.assertIsNone(format_cardinality({}))
+        self.assertIsNone(format_cardinality(""))
+        self.assertIsNone(format_cardinality(()))
+
+        # Test empty tuple edge cases
+        self.assertIsNone(format_cardinality((None, None)))
+        self.assertIsNone(format_cardinality((0, 0)))
+        self.assertIsNone(format_cardinality((None, 0)))
+        self.assertIsNone(format_cardinality((0, None)))
+
+        # Test single int max set
+        self.assertEqual(format_cardinality(10), (None, 10))
+
+        # Test tuple set
+        set_val = (2, None)
+        self.assertEqual(format_cardinality(set_val), set_val)
+        set_val = (None, 2)
+        self.assertEqual(format_cardinality(set_val), set_val)
+        set_val = (2, 3)
+        self.assertEqual(format_cardinality(set_val), set_val)
+
+        # Test list simple list set
+        set_val = [2, None]
+        self.assertEqual(format_cardinality(set_val), tuple(set_val))
+        set_val = [None, 2]
+        self.assertEqual(format_cardinality(set_val), tuple(set_val))
+        set_val = [2, 3]
+        self.assertEqual(format_cardinality(set_val), tuple(set_val))
+
+        # Test exact value tuple set
+        set_val = (5, 5)
+        self.assertEqual(format_cardinality(set_val), set_val)
+
+        # Test set failures
+        with self.assertRaises(ValueError):
+            format_cardinality("a")
+
+        with self.assertRaises(ValueError):
+            format_cardinality([1])
+
+        with self.assertRaises(ValueError):
+            format_cardinality([1, 2, 3])
+
+        with self.assertRaises(ValueError):
+            format_cardinality({1: 2, 3: 4})
+
+        with self.assertRaises(ValueError):
+            format_cardinality(-1)
+
+        with self.assertRaises(ValueError):
+            format_cardinality((1, "b"))
+
+        with self.assertRaises(ValueError):
+            format_cardinality((1, 2, 3))
+
+        with self.assertRaises(ValueError):
+            format_cardinality((-1, 1))
+
+        with self.assertRaises(ValueError):
+            format_cardinality((1, -5))
+
+        with self.assertRaises(ValueError) as exc:
+            format_cardinality((5, 1))
+            self.assertIn("Minimum larger than maximum ", str(exc))
diff --git a/test/test_validation_integration.py b/test/test_validation_integration.py
@@ -28,6 +28,10 @@ def tearDown(self):
         sys.stdout = self.stdout_orig
         self.capture.close()
 
+    def _clear_output(self):
+        self.capture.seek(0)
+        self.capture.truncate()
+
     def _get_captured_output(self):
         out = [txt.strip() for txt in self.capture.getvalue().split('\n') if txt]
 
@@ -42,6 +46,9 @@ def test_property_values_cardinality(self):
         doc = odml.Document()
         sec = odml.Section(name="sec", type="sec_type", parent=doc)
 
+        # Making sure only the required warnings are tested
+        self._clear_output()
+
         # -- Test cardinality validation warnings on Property init
         # Test warning when setting invalid minimum
         _ = odml.Property(name="prop_card_min", values=[1], val_cardinality=(2, None), parent=sec)