1 files changed, 71 insertions, 0 deletions
diff --git a/vnftest/contexts/base.py b/vnftest/contexts/base.py
new file mode 100644
index 0000000..ac1591c
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+++ b/vnftest/contexts/base.py
@@ -0,0 +1,71 @@
+##############################################################################
+# Copyright 2018 EuropeanSoftwareMarketingLtd.
+# ===================================================================
+#  Licensed under the ApacheLicense, Version2.0 (the"License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# software distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and limitations under
+# the License
+##############################################################################
+import abc
+import six
+import vnftest.common.utils as utils
+import yaml
+
+
+@six.add_metaclass(abc.ABCMeta)
+class Context(object):
+    """Class that represents a context in the logical model"""
+    list = []
+    vnf_descriptor = {}
+
+    @classmethod
+    def load_vnf_descriptor(cls, vnf_descriptor_path):
+        with open(vnf_descriptor_path) as f:
+            cls.vnf_descriptor = yaml.safe_load(f)
+
+    @staticmethod
+    def split_name(name, sep='.'):
+        try:
+            name_iter = iter(name.split(sep))
+        except AttributeError:
+            # name is not a string
+            return None, None
+        return next(name_iter), next(name_iter, None)
+
+    def __init__(self):
+        Context.list.append(self)
+
+    @abc.abstractmethod
+    def init(self, attrs):
+        """Initiate context."""
+
+    @staticmethod
+    def get_cls(context_type):
+        """Return class of specified type."""
+        for context in utils.itersubclasses(Context):
+            if context_type == context.__context_type__:
+                return context
+        raise RuntimeError("No such context_type %s" % context_type)
+
+    @staticmethod
+    def get(context_type):
+        """Returns instance of a context for context type.
+        """
+        return Context.get_cls(context_type)()
+
+    def _delete_context(self):
+        Context.list.remove(self)
+
+    @abc.abstractmethod
+    def deploy(self):
+        """Deploy context."""
+
+    @abc.abstractmethod
+    def undeploy(self):
+        """Undeploy context."""
+        self._delete_context()