#
# Functions for interacting with the network_types table in the database
#
#
from types import StringTypes
from PLC.Faults import *
from PLC.Parameter import Parameter
from PLC.Storage.AlchemyObject import AlchemyObj

class NetworkType(AlchemyObj):
    """
    Representation of a row in the network_types table. To use,
    instantiate with a dict of values.
    """

    tablename = 'network_types'
    fields = {
        'type': Parameter(str, "Network type", max = 20, primary_key=True),
        }

    def validate_type(self, name):
        # Make sure name is not blank
        if not len(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 sync(self, commit=True, validate=True):
        AlchemyObj.sync(self, commit=commit, validate=validate)
        AlchemyObj.insert(self, dict(self)) 

    def delete(self, commit=True):
        assert 'type' in self
        AlchemyObj.delete(self, dict(self))

class NetworkTypes(list):
    """
    Representation of the network_types table in the database.
    """

    def __init__(self, api, types = None):
        if not types:
            network_types = NetworkType().select()
        elif isinstance(types, StringTypes):
            network_types = NetworkType().select({'type': types})
        else:
            raise PLCInvalidArgument, "Wrong network type filter %r"%types 

        self.extend(network_types)