From 3341948a60f493163605b1e311c412b7d5df09e5 Mon Sep 17 00:00:00 2001
From: Jim MacArthur <jim.macarthur@codethink.co.uk>
Date: Sun, 29 Jul 2018 20:51:44 +0100
Subject: Move KeyStrength enum out to element_enums.py

---
 buildstream/__init__.py                     |  3 +-
 buildstream/_artifactcache/artifactcache.py |  2 +-
 buildstream/element.py                      | 39 ++----------------
 buildstream/element_enums.py                | 61 +++++++++++++++++++++++++++++
 4 files changed, 67 insertions(+), 38 deletions(-)
 create mode 100644 buildstream/element_enums.py

diff --git a/buildstream/__init__.py b/buildstream/__init__.py
index 895adc60f..0f6efb0da 100644
--- a/buildstream/__init__.py
+++ b/buildstream/__init__.py
@@ -30,6 +30,7 @@ if "_BST_COMPLETION" not in os.environ:
     from .sandbox import Sandbox, SandboxFlags
     from .plugin import Plugin
     from .source import Source, SourceError, Consistency, SourceFetcher
-    from .element import Element, ElementError, Scope
+    from .element import Element, ElementError
+    from .element_enums import Scope
     from .buildelement import BuildElement
     from .scriptelement import ScriptElement
diff --git a/buildstream/_artifactcache/artifactcache.py b/buildstream/_artifactcache/artifactcache.py
index a7af94719..d98c291f9 100644
--- a/buildstream/_artifactcache/artifactcache.py
+++ b/buildstream/_artifactcache/artifactcache.py
@@ -21,7 +21,7 @@ import os
 import string
 from collections import Mapping, namedtuple
 
-from ..element import _KeyStrength
+from ..element_enums import _KeyStrength
 from .._exceptions import ArtifactError, ImplError, LoadError, LoadErrorReason
 from .._message import Message, MessageType
 from .. import utils
diff --git a/buildstream/element.py b/buildstream/element.py
index bb205c777..40cac47cd 100644
--- a/buildstream/element.py
+++ b/buildstream/element.py
@@ -78,7 +78,6 @@ import stat
 import copy
 from collections import Mapping, OrderedDict
 from contextlib import contextmanager
-from enum import Enum
 import tempfile
 import shutil
 
@@ -98,41 +97,9 @@ from .plugin import CoreWarnings
 from .sandbox._config import SandboxConfig
 
 from .storage.directory import Directory
-from .storage._filebaseddirectory import FileBasedDirectory, VirtualDirectoryError
-
-
-# _KeyStrength():
-#
-# Strength of cache key
-#
-class _KeyStrength(Enum):
-
-    # Includes strong cache keys of all build dependencies and their
-    # runtime dependencies.
-    STRONG = 1
-
-    # Includes names of direct build dependencies but does not include
-    # cache keys of dependencies.
-    WEAK = 2
-
-
-class Scope(Enum):
-    """Types of scope for a given element"""
-
-    ALL = 1
-    """All elements which the given element depends on, following
-    all elements required for building. Including the element itself.
-    """
-
-    BUILD = 2
-    """All elements required for building the element, including their
-    respective run dependencies. Not including the given element itself.
-    """
-
-    RUN = 3
-    """All elements required for running the element. Including the element
-    itself.
-    """
+from .storage._filebaseddirectory import FileBasedDirectory
+from .storage.directory import VirtualDirectoryError
+from .element_enums import _KeyStrength, Scope
 
 
 class ElementError(BstError):
diff --git a/buildstream/element_enums.py b/buildstream/element_enums.py
new file mode 100644
index 000000000..2f2fb54d2
--- /dev/null
+++ b/buildstream/element_enums.py
@@ -0,0 +1,61 @@
+#
+#  Copyright (C) 2018 Bloomberg LP
+#
+#  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>
+#        Jim MacArthur <jim.macarthur@codethink.co.uk>
+
+"""
+Element - Globally visible enumerations
+=======================================
+
+"""
+
+from enum import Enum
+
+
+# _KeyStrength():
+#
+# Strength of cache key
+#
+class _KeyStrength(Enum):
+
+    # Includes strong cache keys of all build dependencies and their
+    # runtime dependencies.
+    STRONG = 1
+
+    # Includes names of direct build dependencies but does not include
+    # cache keys of dependencies.
+    WEAK = 2
+
+
+class Scope(Enum):
+    """Types of scope for a given element"""
+
+    ALL = 1
+    """All elements which the given element depends on, following
+    all elements required for building. Including the element itself.
+    """
+
+    BUILD = 2
+    """All elements required for building the element, including their
+    respective run dependencies. Not including the given element itself.
+    """
+
+    RUN = 3
+    """All elements required for running the element. Including the element
+    itself.
+    """
-- 
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