/**
* Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
*
* 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.
*/
package org.onebusaway.transit_data_federation.impl.otp.graph;
import org.onebusaway.transit_data_federation.impl.otp.GraphContext;
import org.onebusaway.transit_data_federation.services.realtime.ArrivalAndDepartureInstance;
import org.onebusaway.transit_data_federation.services.tripplanner.StopTransfer;
import org.opentripplanner.routing.core.EdgeNarrative;
import org.opentripplanner.routing.core.State;
import org.opentripplanner.routing.core.StateEditor;
import org.opentripplanner.routing.core.TraverseOptions;
import org.opentripplanner.routing.core.Vertex;
public class TransferAndDepartureEdge extends AbstractEdge {
private ArrivalAndDepartureInstance _instance;
private StopTransfer _transfer;
public TransferAndDepartureEdge(GraphContext context,
ArrivalAndDepartureInstance instance, StopTransfer transfer) {
super(context);
_instance = instance;
_transfer = transfer;
}
@Override
public State traverse(State s0) {
TraverseOptions options = s0.getOptions();
if (options.isArriveBy())
return traverseReverse(s0);
else
return traverseForward(s0);
}
private State traverseForward(State s0) {
EdgeNarrative narrative = createNarrative(s0, s0.getTime());
StateEditor edit = s0.edit(this, narrative);
TraverseOptions options = s0.getOptions();
int transferTime = computeTransferTime(options);
edit.setTime(_instance.getBestArrivalTime());
double weight = computeWeightForTransferTime(options, transferTime);
edit.incrementWeight(weight);
return edit.makeState();
}
private State traverseReverse(State s0) {
TraverseOptions options = s0.getOptions();
/**
* Check if we've reached our transfer limit
*/
if (s0.getNumBoardings() >= options.maxTransfers)
return null;
int transferTime = computeTransferTime(options);
long t = s0.getTime() - ((transferTime + options.minTransferTime) * 1000);
EdgeNarrative narrative = createNarrative(s0, t);
StateEditor edit = s0.edit(this, narrative);
edit.setTime(t);
double weight = computeWeightForTransferTime(options, transferTime);
edit.incrementWeight(weight);
return edit.makeState();
}
/****
* Private Methods
****/
private EdgeNarrative createNarrative(State s0, long time) {
Vertex fromVertex = new ArrivalVertex(_context, _transfer.getStop(), time);
Vertex toVertex = new BlockDepartureVertex(_context, _instance);
return narrative(s0, fromVertex, toVertex);
}
private double computeWeightForTransferTime(TraverseOptions options,
int transferTime) {
return transferTime * options.walkReluctance + options.boardCost
+ options.minTransferTime * options.waitReluctance;
}
private int computeTransferTime(TraverseOptions options) {
int transferTime = _transfer.getMinTransferTime();
if (transferTime > 0)
return transferTime;
double walkingVelocity = options.speed;
double distance = _transfer.getDistance();
// time to walk = meters / (meters/sec) = sec
int t = (int) (distance / walkingVelocity);
// transfer time = time to walk + min transfer buffer time
return t;
}
}