Make workflow accessible via application

Created by: stefanoborini

Provides access to the workflow via the application. This is required because the envisage plugins (and thus the factories) have convenient access to the application, but not to other plugins, where the workflow is actually loaded.

force_bdss/bdss_application.py

@@ -6,8 +6,9 @@ from stevedore.exception import NoMatches
 
 from envisage.api import Application
 from envisage.core_plugin import CorePlugin
-from traits.api import Unicode, Bool
+from traits.api import Unicode, Bool, Property
 
+from force_bdss.ids import InternalPluginID
 from .factory_registry_plugin import FactoryRegistryPlugin
 from .core_evaluation_driver import CoreEvaluationDriver
 from .core_mco_driver import CoreMCODriver
@@ -28,6 +29,9 @@ class BDSSApplication(Application):
     #: coordination of the MCO itself. See design notes for more details.
     evaluate = Bool()
 
+    #: Gives the currently opened workflow
+    workflow = Property()
+
     def __init__(self, evaluate, workflow_filepath):
         self.evaluate = evaluate
         self.workflow_filepath = workflow_filepath
@@ -53,6 +57,15 @@ class BDSSApplication(Application):
 
         super(BDSSApplication, self).__init__(plugins=plugins)
 
+    def _get_workflow(self):
+        if self.evaluate:
+            plugin = self.get_plugin(
+                InternalPluginID.CORE_EVALUATION_DRIVER_ID)
+        else:
+            plugin = self.get_plugin(InternalPluginID.CORE_MCO_DRIVER_ID)
+
+        return plugin.workflow
+
 
 def _import_extensions(plugins, ext):
     """Service routine extracted for testing.