1 files changed, 54 insertions, 0 deletions
diff --git a/src/olpc/datastore/sxattr.py b/src/olpc/datastore/sxattr.py
new file mode 100644
index 0000000..78a64f3
--- /dev/null
+++ b/src/olpc/datastore/sxattr.py
@@ -0,0 +1,54 @@
+""" 
+simplified xattr
+~~~~~~~~~~~~~~~~~~~~
+automatically manage prefixes into the xattr namespace
+
+""" 
+
+__author__ = 'Benjamin Saller <bcsaller@objectrealms.net>'
+__docformat__ = 'restructuredtext'
+__copyright__ = 'Copyright ObjectRealms, LLC, 2007'
+__license__  = 'The GNU Public License V2+'
+
+
+import xattr
+
+class Xattr(object):
+    def __init__(self, filename, prefix, implicitUser=True):
+        self.filename = filename
+        self.prefix=[]
+        if implicitUser: self.prefix.append('user')
+        self.prefix.append(prefix)
+        self.ns = '.'.join(self.prefix)
+        self.keyed = lambda x: '.'.join((self.ns, x))
+        
+    def __getitem__(self, key):
+        v = xattr.getxattr(self.filename, self.keyed(key))
+        return v.decode('utf-8')
+
+    def __setitem__(self, key, value):
+        if isinstance(value, unicode):
+            value = value.encode("utf-8")
+        else:
+            value = str(value)
+        xattr.setxattr(self.filename, self.keyed(key), value)
+
+    def __delitem__(self, key):
+        xattr.removexattr(self.filename, self.keyed(key))
+
+    def get(self, key, default=None):
+        try:
+            return self[key]
+        except IOError:
+            return default
+        
+    def iterkeys(self):
+        all = xattr.listxattr(self.filename)
+        for key in all:
+            if key.startswith(self.ns):
+                yield key[len(self.ns) + 1:]
+            
+    def keys(self):
+        return list(self.iterkeys())
+    
+