added loader module for importing a python class or django model by name

geocamUtil/loader.py

@@ -0,0 +1,29 @@
+# __BEGIN_LICENSE__
+# Copyright (C) 2008-2010 United States Government as represented by
+# the Administrator of the National Aeronautics and Space Administration.
+# All Rights Reserved.
+# __END_LICENSE__
+
+"""
+Utilities for loading Python classes and Django models by name. Modeled
+in part on django.utils.importlib.
+"""
+
+def getModClass(name):
+    """converts 'app_name.ModelName' to ['stuff.module', 'ClassName']"""
+    try:
+        dot = name.rindex('.')
+    except ValueError:
+        return name, ''
+    return name[:dot], name[dot + 1:]
+
+
+def getModelByName(qualifiedName):
+    """
+    converts 'module_name.ClassName' to a class object
+    """
+    appName, className = qualifiedName.split('.', 1)
+    modelsName = '%s.models' % appName
+    __import__(modelsName)
+    mod = sys.modules[modelsName]
+    return getattr(mod, className)

geocamUtil/storeTest.py

@@ -0,0 +1,31 @@
+# __BEGIN_LICENSE__
+# Copyright (C) 2008-2010 United States Government as represented by
+# the Administrator of the National Aeronautics and Space Administration.
+# All Rights Reserved.
+# __END_LICENSE__
+
+import shutil
+
+from geocamUtil.store import FileStore, LruCacheStore
+
+
+class StoreTest(TestCase):
+    def storeTest(self, storeFactory):
+        tempDir = tempfile.mkdtemp('-storeTestDir')
+
+        store1 = storeFactory(tempDir)
+        store1['a'] = 1
+        store1['b'] = 2
+        store1.sync()
+
+        store2 = storeFactory(tempDir)
+        self.assertEqual(store2['a'], 1)
+        self.assertEqual(store2['b'], 2)
+
+        shutil.rmtree(tempDir)
+
+    def test_FileStore(self):
+        self.storeTest(FileStore)
+
+    def test_LruCacheStore(self):
+        self.storeTest(lambda path: LruCacheStore(FileStore(path), 100))

geocamUtil/tests.py

@@ -14,6 +14,7 @@
 from geocamUtil.models.ExtrasFieldTest import ExtrasFieldTest
 from geocamUtil.BuilderTest import BuilderTest
 from geocamUtil.InstallerTest import InstallerTest
+from geocamUtil.storeTest import StoreTest
 from geocamUtil.icons.rotateTest import IconsRotateTest
 from geocamUtil.icons.svgTest import IconsSvgTest