Merge from trunk

[plcapi.git] / trunk / PLC / NetworkMethods.py

diff --git a/trunk/PLC/NetworkMethods.py b/trunk/PLC/NetworkMethods.py
new file mode 100644 (file)
index 0000000..41ccfab
--- /dev/null
+++ b/trunk/PLC/NetworkMethods.py
@@ -0,0 +1,53 @@
+#
+# Functions for interacting with the network_methods table in the database
+#
+# Mark Huang <mlhuang@cs.princeton.edu>
+# Copyright (C) 2006 The Trustees of Princeton University
+#
+# $Id$
+#
+
+from PLC.Faults import *
+from PLC.Parameter import Parameter
+from PLC.Table import Row, Table
+
+class NetworkMethod(Row):
+    """
+    Representation of a row in the network_methods table. To use,
+    instantiate with a dict of values.
+    """
+
+    table_name = 'network_methods'
+    primary_key = 'method'
+    join_tables = ['nodenetworks']
+    fields = {
+        'method': Parameter(str, "Network method", max = 20),
+        }
+
+    def validate_method(self, name):
+       # Make sure name is not blank
+        if not len(name):
+            raise PLCInvalidArgument, "Network method must be specified"
+       
+       # Make sure network method does not alredy exist
+       conflicts = NetworkMethods(self.api, [name])
+        if conflicts:
+            raise PLCInvalidArgument, "Network method name already in use"
+
+       return name
+
+class NetworkMethods(Table):
+    """
+    Representation of the network_methods table in the database.
+    """
+
+    def __init__(self, api, methods = None):
+        Table.__init__(self, api, NetworkMethod)
+
+        sql = "SELECT %s FROM network_methods" % \
+              ", ".join(NetworkMethod.fields)
+        
+        if methods:
+            sql += " WHERE method IN (%s)" % ", ".join(map(api.db.quote, methods))
+
+        self.selectall(sql)