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Copyright (C) 2007 Google Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import bisect import cStringIO as StringIO import datetime import itertools import os try: import sqlite3 as sqlite except ImportError: from pysqlite2 import dbapi2 as sqlite import tempfile import time import warnings # Objects in a schedule (Route, Trip, etc) should not keep a strong reference # to the Schedule object to avoid a reference cycle. Schedule needs to use # __del__ to cleanup its temporary file. The garbage collector can't handle # reference cycles containing objects with custom cleanup code. import weakref import zipfile import gtfsfactory import problems as problems_module from transitfeed.util import defaultdict import util class Schedule: """Represents a Schedule, a collection of stops, routes, trips and an agency. This is the main class for this module.""" def __init__(self, problem_reporter=None, memory_db=True, check_duplicate_trips=False, gtfs_factory=None): if gtfs_factory is None: gtfs_factory = gtfsfactory.GetGtfsFactory() self._gtfs_factory = gtfs_factory # Map from table name to list of columns present in this schedule self._table_columns = {} self._agencies = {} self.stops = {} self.routes = {} self.trips = {} self.service_periods = {} self.fares = {} self.fare_zones = {} # represents the set of all known fare zones self._shapes = {} # shape_id to Shape # A map from transfer._ID() to a list of transfers. A list is used so # there can be more than one transfer with each ID. Once GTFS explicitly # prohibits duplicate IDs this might be changed to a simple dict of # Transfers. self._transfers = defaultdict(lambda: []) self._default_service_period = None self._default_agency = None if problem_reporter is None: self.problem_reporter = problems_module.default_problem_reporter else: self.problem_reporter = problem_reporter self._check_duplicate_trips = check_duplicate_trips self.ConnectDb(memory_db) def AddTableColumn(self, table, column): """Add column to table if it is not already there.""" if column not in self._table_columns[table]: self._table_columns[table].append(column) def AddTableColumns(self, table, columns): """Add columns to table if they are not already there. Args: table: table name as a string columns: an iterable of column names""" table_columns = self._table_columns.setdefault(table, []) for attr in columns: if attr not in table_columns: table_columns.append(attr) def GetTableColumns(self, table): """Return list of columns in a table.""" return self._table_columns[table] def __del__(self): self._connection.cursor().close() self._connection.close() if hasattr(self, '_temp_db_filename'): os.remove(self._temp_db_filename) def ConnectDb(self, memory_db): if memory_db: self._connection = sqlite.connect(":memory:") else: try: self._temp_db_file = tempfile.NamedTemporaryFile() self._connection = sqlite.connect(self._temp_db_file.name) except sqlite.OperationalError: # Windows won't let a file be opened twice. mkstemp does not remove the # file when all handles to it are closed. self._temp_db_file = None (fd, self._temp_db_filename) = tempfile.mkstemp(".db") os.close(fd) self._connection = sqlite.connect(self._temp_db_filename) cursor = self._connection.cursor() cursor.execute("""CREATE TABLE stop_times ( trip_id CHAR(50), arrival_secs INTEGER, departure_secs INTEGER, stop_id CHAR(50), stop_sequence INTEGER, stop_headsign VAR CHAR(100), pickup_type INTEGER, drop_off_type INTEGER, shape_dist_traveled FLOAT);""") cursor.execute("""CREATE INDEX trip_index ON stop_times (trip_id);""") cursor.execute("""CREATE INDEX stop_index ON stop_times (stop_id);""") def GetStopBoundingBox(self): return (min(s.stop_lat for s in self.stops.values()), min(s.stop_lon for s in self.stops.values()), max(s.stop_lat for s in self.stops.values()), max(s.stop_lon for s in self.stops.values()), ) def AddAgency(self, name, url, timezone, agency_id=None): """Adds an agency to this schedule.""" agency = self._gtfs_factory.Agency(name, url, timezone, agency_id) self.AddAgencyObject(agency) return agency def AddAgencyObject(self, agency, problem_reporter=None, validate=False): assert agency._schedule is None if not problem_reporter: problem_reporter = self.problem_reporter if agency.agency_id in self._agencies: problem_reporter.DuplicateID('agency_id', agency.agency_id) return self.AddTableColumns('agency', agency._ColumnNames()) agency._schedule = weakref.proxy(self) if validate: agency.Validate(problem_reporter) self._agencies[agency.agency_id] = agency def GetAgency(self, agency_id): """Return Agency with agency_id or throw a KeyError""" return self._agencies[agency_id] def GetDefaultAgency(self): """Return the default Agency. If no default Agency has been set select the default depending on how many Agency objects are in the Schedule. If there are 0 make a new Agency the default, if there is 1 it becomes the default, if there is more than 1 then return None. """ if not self._default_agency: if len(self._agencies) == 0: self.NewDefaultAgency() elif len(self._agencies) == 1: self._default_agency = self._agencies.values()[0] return self._default_agency def NewDefaultAgency(self, **kwargs): """Create a new Agency object and make it the default agency for this Schedule""" agency = self._gtfs_factory.Agency(**kwargs) if not agency.agency_id: agency.agency_id = util.FindUniqueId(self._agencies) self._default_agency = agency self.SetDefaultAgency(agency, validate=False) # Blank agency won't validate return agency def SetDefaultAgency(self, agency, validate=True): """Make agency the default and add it to the schedule if not already added""" assert isinstance(agency, self._gtfs_factory.Agency) self._default_agency = agency if agency.agency_id not in self._agencies: self.AddAgencyObject(agency, validate=validate) def GetAgencyList(self): """Returns the list of Agency objects known to this Schedule.""" return self._agencies.values() def GetServicePeriod(self, service_id): """Returns the ServicePeriod object with the given ID.""" return self.service_periods[service_id] def GetDefaultServicePeriod(self): """Return the default ServicePeriod. If no default ServicePeriod has been set select the default depending on how many ServicePeriod objects are in the Schedule. If there are 0 make a new ServicePeriod the default, if there is 1 it becomes the default, if there is more than 1 then return None. """ if not self._default_service_period: if len(self.service_periods) == 0: self.NewDefaultServicePeriod() elif len(self.service_periods) == 1: self._default_service_period = self.service_periods.values()[0] return self._default_service_period def NewDefaultServicePeriod(self): """Create a new ServicePeriod object, make it the default service period and return it. The default service period is used when you create a trip without providing an explict service period. """ service_period = self._gtfs_factory.ServicePeriod() service_period.service_id = util.FindUniqueId(self.service_periods) # blank service won't validate in AddServicePeriodObject self.SetDefaultServicePeriod(service_period, validate=False) return service_period def SetDefaultServicePeriod(self, service_period, validate=True): assert isinstance(service_period, self._gtfs_factory.ServicePeriod) self._default_service_period = service_period if service_period.service_id not in self.service_periods: self.AddServicePeriodObject(service_period, validate=validate) def AddServicePeriodObject(self, service_period, problem_reporter=None, validate=True): if not problem_reporter: problem_reporter = self.problem_reporter if service_period.service_id in self.service_periods: problem_reporter.DuplicateID('service_id', service_period.service_id) return if validate: service_period.Validate(problem_reporter) self.service_periods[service_period.service_id] = service_period def GetServicePeriodList(self): return self.service_periods.values() def GetDateRange(self): """Returns a tuple of (earliest, latest) dates on which the service periods in the schedule define service, in YYYYMMDD form.""" ranges = [period.GetDateRange() for period in self.GetServicePeriodList()] starts = filter(lambda x: x, [item[0] for item in ranges]) ends = filter(lambda x: x, [item[1] for item in ranges]) if not starts or not ends: return (None, None) return (min(starts), max(ends)) def GetServicePeriodsActiveEachDate(self, date_start, date_end): """Return a list of tuples (date, [period1, period2, ...]). For each date in the range [date_start, date_end) make list of each ServicePeriod object which is active. Args: date_start: The first date in the list, a date object date_end: The first date after the list, a date object Returns: A list of tuples. Each tuple contains a date object and a list of zero or more ServicePeriod objects. """ date_it = date_start one_day = datetime.timedelta(days=1) date_service_period_list = [] while date_it < date_end: periods_today = [] date_it_string = date_it.strftime("%Y%m%d") for service in self.GetServicePeriodList() |