1 files changed, 59 insertions, 0 deletions
diff --git a/azure/aria/aria-extension-cloudify/src/aria/aria/parser/reading/source.py b/azure/aria/aria-extension-cloudify/src/aria/aria/parser/reading/source.py
new file mode 100644
index 0000000..6fff2f6
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+++ b/azure/aria/aria-extension-cloudify/src/aria/aria/parser/reading/source.py
@@ -0,0 +1,59 @@
+# Licensed 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.
+
+from ..loading import LiteralLocation, UriLocation
+from .yaml import YamlReader
+from .json import JsonReader
+from .jinja import JinjaReader
+from .exceptions import ReaderNotFoundError
+
+
+EXTENSIONS = {
+    '.yaml': YamlReader,
+    '.json': JsonReader,
+    '.jinja': JinjaReader}
+
+
+class ReaderSource(object):
+    """
+    Base class for ARIA reader sources.
+
+    Reader sources provide appropriate :class:`Reader` instances for locations.
+    """
+
+    @staticmethod
+    def get_reader(context, location, loader):  # pylint: disable=unused-argument
+        raise ReaderNotFoundError('location: %s' % location)
+
+
+class DefaultReaderSource(ReaderSource):
+    """
+    The default ARIA reader source will generate a :class:`YamlReader` for
+    locations that end in ".yaml", a :class:`JsonReader` for locations that
+    end in ".json",  and a :class:`JinjaReader` for locations that end in
+    ".jinja".
+    """
+
+    def __init__(self, literal_reader_class=YamlReader):
+        super(DefaultReaderSource, self).__init__()
+        self.literal_reader_class = literal_reader_class
+
+    def get_reader(self, context, location, loader):
+        if isinstance(location, LiteralLocation):
+            return self.literal_reader_class(context, location, loader)
+
+        elif isinstance(location, UriLocation):
+            for extension, reader_class in EXTENSIONS.iteritems():
+                if location.uri.endswith(extension):
+                    return reader_class(context, location, loader)
+
+        return super(DefaultReaderSource, self).get_reader(context, location, loader)