Split up factory objects and base data model objects.

Better to have a separate file for each class clearly addressing
it's purpose with it's filename.

  Source base data model -> source.py
  SourceFactory -> _sourcefactory.py
  Element base data model -> element.py
  ElementFactory -> _elementfactory.py

Also moved the _plugin.py to _plugincontext.py, since the object
is infact _PluginContext, lets follow this rule all around for
code clarity.

1 files changed, 56 insertions, 0 deletions

diff --git a/buildstream/_elementfactory.py b/buildstream/_elementfactory.py
new file mode 100644
index 000000000..1257c8795
--- /dev/null
+++ b/buildstream/_elementfactory.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+#
+#  Copyright (C) 2016 Codethink Limited
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library. If not, see <http://www.gnu.org/licenses/>.
+#
+#  Authors:
+#        Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
+
+from ._plugincontext import _PluginContext
+from .config import _site_info
+from .element import Element
+
+# A ElementFactory creates Element instances
+# in the context of a given factory
+#
+# Args:
+#     plugin_base (PluginBase): The main PluginBase object to work with
+#     searchpath (list):        A list of external paths to search for Element plugins
+#
+class _ElementFactory(_PluginContext):
+
+    def __init__(self, plugin_base, searchpath=None):
+
+        if searchpath is None:
+            searchpath = []
+        
+        searchpath.insert(0, _site_info['element_plugins'])
+        super().__init__(plugin_base, Element, searchpath)
+
+    # create():
+    #
+    # Create an Element object, the pipeline uses this to create Element
+    # objects on demand for a given pipeline.
+    #
+    # Args:
+    #     kind (str): The kind of Element to create
+    #
+    # Returns: A newly created Element object of the appropriate kind
+    #
+    # Raises: PluginError
+    #
+    def create(self, kind):
+        element_type = self.lookup(kind)
+        return element_type()