1 files changed, 43 insertions, 0 deletions
diff --git a/morphlib/artifactcachereference.py b/morphlib/artifactcachereference.py
new file mode 100644
index 00000000..4cc73290
--- /dev/null
+++ b/morphlib/artifactcachereference.py
@@ -0,0 +1,43 @@
+# Copyright (C) 2012  Codethink Limited
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+# 
+# This program 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 General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+class ArtifactCacheReference(object):
+
+    '''Represent the information needed to retrieve an artifact
+
+    The artifact cache doesn't need to know the dependencies or the
+    morphology of an artifact, it just needs to know the cache key,
+    name and kind.
+    '''
+    def __init__(self, name, cache_key, kind):
+        self.name = name
+        self.cache_key = cache_key
+        self.kind = kind
+
+    def basename(self):
+        return '%s.%s.%s' % (self.cache_key,
+                             self.kind,
+                             self.name)
+
+    def metadata_basename(self, metadata_name):
+        return '%s.%s.%s.%s' % (self.cache_key,
+                                self.kind,
+                                self.name,
+                                metadata_name)
+
+    @classmethod
+    def from_artifact(klass, artifact):
+        return klass(artifact.name, artifact.cache_key,
+                     artifact.source.morphology['kind'])