interface to network_types table

[plcapi.git] / PLC / NetworkTypes.py

diff --git a/PLC/NetworkTypes.py b/PLC/NetworkTypes.py
new file mode 100644 (file)
index 0000000..609b16e
--- /dev/null
+++ b/PLC/NetworkTypes.py
@@ -0,0 +1,73 @@
+#
+# Functions for interacting with the network_types table in the database
+#
+# Mark Huang <mlhuang@cs.princeton.edu>
+# Copyright (C) 2006 The Trustees of Princeton University
+#
+# $Id: NetworkTypes.py,v 1.2 2006/10/06 18:19:41 mlhuang Exp $
+#
+
+from PLC.Faults import *
+from PLC.Parameter import Parameter
+from PLC.Table import Row, Table
+
+class NetworkType(Row):
+    """
+    Representation of a row in the network_types table. To use,
+    instantiate with a dict of values.
+    """
+
+    table_name = 'network_types'
+    primary_key = 'type'
+    fields = {
+        'type': Parameter(str, "Network type", max = 20),
+        }
+
+    def __init__(self, api, fields = {}):
+        Row.__init__(self, fields)
+        self.api = api
+
+    def validate_type(self, name):
+       # Remove leading and trailing spaces
+       name = name.strip()
+
+       # Make sure name is not blank after we removed the spaces
+        if not name:
+            raise PLCInvalidArgument, "Network type must be specified"
+       
+       # Make sure network type does not alredy exist
+       conflicts = NetworkTypes(self.api, [name])
+        if conflicts:
+            raise PLCInvalidArgument, "Network type name already in use"
+
+       return name
+
+    def delete(self, commit = True):
+        assert 'type' in self
+
+        # Clean up miscellaneous join tables
+        for table in ['nodenetworks', 'network_types']:
+            self.api.db.do("DELETE FROM " + table + \
+                           " WHERE type = %(type)s",
+                           self)
+
+        if commit:
+            self.api.db.commit()
+        
+class NetworkTypes(Table):
+    """
+    Representation of the network_types table in the database.
+    """
+
+    def __init__(self, api, names = None):
+        sql = "SELECT %s FROM network_types" % \
+              ", ".join(NetworkType.fields)
+        
+        if names:
+            # Separate the list into integers and strings
+            sql += " WHERE type IN (%s)" % ", ".join(api.db.quote(names))
+
+        rows = api.db.selectall(sql)
+
+        for row in rows:
+            self[row['type']] = NetworkType(api, row)