from types import StringTypes
import time
import re
import datetime

from PLC.Faults import *
from PLC.Parameter import Parameter, Mixed
from PLC.Filter import Filter
from PLC.Debug import profile
from PLC.Timestamp import Timestamp
from PLC.Storage.AlchemyObject import AlchemyObj

class SliceInstance(AlchemyObj):
    """
    Representation of a row in the slice_node table. To use, optionally
    instantiate with a dict of values. Update as you would a
    dict. Commit to the database with sync().To use, instantiate
    with a dict of values.
    """

    tablename = 'slice_instance'
 
    fields = {
        'slice_id': Parameter(int, "Slice identifier", primary_key=True),
        'instance_id': Parameter(str, "Instance identifier", indexed=True),
        }

    tags = {}

    def sync(self, commit = True, validate=True):
        """
        Add the record
        """
        AlchemyObj.sync(self, commit, validate)
        AlchemyObj.insert(self, dict(self))

    def delete(self, commit = True):
        """
        Delete existing slice.
        """
        AlchemyObj.delete(self, dict(self))


class SliceInstances(list):
    """
    Representation of row(s) from the slices table in the
    database.
    """

    def __init__(self, api, filter = None, columns = None):
         
        # the view that we're selecting upon: start with view_slices
        if not filter:
            slice_instances = SliceInstance().select()
        elif isinstance(filter, dict):
            slices_instances = SliceInstance().select(filter=filter)
        else:
            raise PLCInvalidArgument, "Wrong slice_instance filter %r"%filter

        for slice_instance in slice_instances:
            self.append(slice_instance)