Clean up redundant code.

stix2/sources/__init__.py

@@ -67,16 +67,8 @@ class DataStore(object):
     def __init__(self, name="DataStore"):
         self.name = name
         self.id = make_id()
-        self.source = DataSource()
-        self.sink = DataSink()
-
-    @property
-    def source(self):
-        return self.source
-
-    @property
-    def sink(self):
-        return self.sink
+        self.source = None
+        self.sink = None
 
     def get(self, stix_id):
         """

stix2/sources/filesystem.py

@@ -26,14 +26,6 @@ class FileSystemStore(DataStore):
         self.source = FileSystemSource(stix_dir=stix_dir)
         self.sink = FileSystemSink(stix_dir=stix_dir)
 
-    @property
-    def source(self):
-        return self.source
-
-    @property
-    def sink(self):
-        return self.sink
-
     # file system sink API calls
 
     def add(self, stix_objs):

stix2/sources/memory.py

@@ -64,14 +64,6 @@ class MemoryStore(DataStore):
         self.source = MemorySource(stix_data=self.data, _store=True)
         self.sink = MemorySink(stix_data=self.data, _store=True)
 
-    @property
-    def source(self):
-        return self.source
-
-    @property
-    def sink(self):
-        return self.sink
-
     # memory sink API calls
 
     def add(self, stix_data):

stix2/sources/taxii.py

@@ -32,15 +32,7 @@ class TAXIICollectionStore(DataStore):
         self.name = name
         self.id = make_id()
         self.source = TAXIICollectionSource(taxii_client, api_root_name, collection_id, user, password)
-        self.sink = self.TAXIICollectionSink(taxii_client, api_root_name, collection_id, user, password)
-
-    @property
-    def source(self):
-        return self.source
-
-    @property
-    def sink(self):
-        return self.sink
+        self.sink = TAXIICollectionSink(taxii_client, api_root_name, collection_id, user, password)
 
     # file system sink API calls