helper methods to set and array_dimensiosn and value rank

opcua/common/node.py

@@ -92,6 +92,35 @@ class Node(object):
         """
         return self.get_attribute(ua.AttributeIds.Value)
 
+    def set_array_dimensions(self, value):
+        """
+        Set attribute ArrayDimensions of node
+        make sure it has the correct data type
+        """
+        v = ua.Variant(value, ua.VariantType.UInt32)
+        self.set_attribute(ua.AttributeIds.ArrayDimensions, ua.DataValue(v))
+
+    def get_array_dimensions(self):
+        """
+        Read and return ArrayDimensions attribute of node
+        """
+        res = self.get_attribute(ua.AttributeIds.ArrayDimensions)
+        return res.Value.Value
+
+    def set_value_rank(self, value):
+        """
+        Set attribute ArrayDimensions of node
+        """
+        v = ua.Variant(value, ua.VariantType.Int32)
+        self.set_attribute(ua.AttributeIds.ValueRank, ua.DataValue(v))
+
+    def get_value_rank(self):
+        """
+        Read and return ArrayDimensions attribute of node
+        """
+        res = self.get_attribute(ua.AttributeIds.ValueRank)
+        return res.Value.Value
+
     def set_value(self, value, varianttype=None):
         """
         Set value of a node. Only variables(properties) have values.
@@ -135,6 +164,8 @@ class Node(object):
     def set_attribute(self, attributeid, datavalue):
         """
         Set an attribute of a node
+        attributeid is a member of ua.AttributeIds
+        datavalue is a ua.DataValue object
         """
         attr = ua.WriteValue()
         attr.NodeId = self.nodeid

tests/tests_common.py

@@ -118,6 +118,8 @@ class CommonTests(object):
     '''
     # jyst to avoid editor warnings
     opc = None
+    assertEqual = lambda x, y: True
+    assertIn = lambda x, y: True
 
     def test_find_servers(self):
         servers = self.opc.find_servers()
@@ -322,11 +324,19 @@ class CommonTests(object):
         tid = v1.get_value()
         self.assertEqual(now, tid)
 
-
     def test_variant_array_dim(self):
         objects = self.opc.get_objects_node()
         l = [[[1.0, 1.0, 1.0, 1.0], [2.0, 2.0, 2.0, 2.0], [3.0, 3.0, 3.0, 3.0]],[[5.0, 5.0, 5.0, 5.0], [7.0, 8.0, 9.0, 01.0], [1.0, 1.0, 1.0, 1.0]]]
         v = objects.add_variable(3, 'variableWithDims', l)
+
+        v.set_array_dimensions([0, 0, 0])
+        dim = v.get_array_dimensions()
+        self.assertEqual(dim, [0, 0, 0])
+
+        v.set_value_rank(0)
+        rank = v.get_value_rank()
+        self.assertEqual(rank, 0)
+
         v2 = v.get_value()
         self.assertEqual(v2, l)
         dv = v.get_data_value()
@@ -340,9 +350,6 @@ class CommonTests(object):
         dv = v.get_data_value()
         self.assertEqual(dv.Value.Dimensions, [2,3,0])
 
-
-
-
     def test_add_numeric_variable(self):
         objects = self.opc.get_objects_node()
         v = objects.add_variable('ns=3;i=888;', '3:numericnodefromstring', 99)