vFW and vDNS support added to azure-plugin

[multicloud/azure.git] / azure / aria / aria-extension-cloudify / src / aria / aria / utils / openclose.py

diff --git a/azure/aria/aria-extension-cloudify/src/aria/aria/utils/openclose.py b/azure/aria/aria-extension-cloudify/src/aria/aria/utils/openclose.py
new file mode 100644 (file)
index 0000000..722885c
--- /dev/null
+++ b/azure/aria/aria-extension-cloudify/src/aria/aria/utils/openclose.py
@@ -0,0 +1,36 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (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
+#
+# Unless required by applicable law or agreed to in writing, 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.
+
+"""
+Utilities for working with open/close patterns.
+"""
+
+class OpenClose(object):
+    """
+    Wraps an object that has ``open()`` and ``close()`` methods to support the ``with`` keyword.
+    """
+
+    def __init__(self, wrapped):
+        self.wrapped = wrapped
+
+    def __enter__(self):
+        if hasattr(self.wrapped, 'open'):
+            self.wrapped.open()
+        return self.wrapped
+
+    def __exit__(self, the_type, value, traceback):
+        if hasattr(self.wrapped, 'close'):
+            self.wrapped.close()
+        return False