add PhysPkgReader factory

Steve Canny · Steve Canny · commit be5d26cea11b · 2013-08-05T14:56:07.000-07:00
diff --git a/opc/phys_pkg.py b/opc/phys_pkg.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+#
+# phys_pkg.py
+#
+# Copyright (C) 2013 Steve Canny scanny@cisco.com
+#
+# This module is part of python-opc and is released under the MIT License:
+# http://www.opensource.org/licenses/mit-license.php
+
+"""
+Provides a general interface to a *physical* OPC package, such as a zip file.
+"""
+
+
+class PhysPkgReader(object):
+    """
+    Factory for physical package reader objects.
+    """
+    def __new__(cls, pkg_file):
+        return ZipPkgReader(pkg_file)
+
+
+class ZipPkgReader(object):
+    """
+    Implements |PhysPkgReader| interface for a zip file OPC package.
+    """
diff --git a/tests/test_phys_pkg.py b/tests/test_phys_pkg.py
@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+#
+# test_phys_pkg.py
+#
+# Copyright (C) 2013 Steve Canny scanny@cisco.com
+#
+# This module is part of python-pptx and is released under the MIT License:
+# http://www.opensource.org/licenses/mit-license.php
+
+"""Test suite for opc.phys_pkg module."""
+
+from opc.phys_pkg import PhysPkgReader
+
+import pytest
+
+from mock import Mock
+
+from .unitutil import class_mock
+
+
+class DescribePhysPkgReader(object):
+
+    @pytest.fixture
+    def ZipPkgReader_(self, request):
+        return class_mock('opc.phys_pkg.ZipPkgReader', request)
+
+    def it_constructs_a_pkg_reader_instance(self, ZipPkgReader_):
+        # mockery ----------------------
+        pkg_file = Mock(name='pkg_file')
+        # exercise ---------------------
+        phys_pkg_reader = PhysPkgReader(pkg_file)
+        # verify -----------------------
+        ZipPkgReader_.assert_called_once_with(pkg_file)
+        assert phys_pkg_reader == ZipPkgReader_.return_value
