/**
* 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 java.util.Collection;
import java.util.List;
import org.onebusaway.transit_data_federation.impl.otp.GraphContext;
import org.onebusaway.transit_data_federation.impl.otp.SupportLibrary;
import org.onebusaway.transit_data_federation.impl.otp.graph.tp.TPArrivalVertex;
import org.onebusaway.transit_data_federation.impl.otp.graph.tp.TPQueryData;
import org.onebusaway.transit_data_federation.impl.otp.graph.tp.TPState;
import org.onebusaway.transit_data_federation.services.transit_graph.StopEntry;
import org.onebusaway.transit_data_federation.services.tripplanner.TransferNode;
import org.onebusaway.transit_data_federation.services.tripplanner.TransferPatternService;
import org.opentripplanner.routing.core.EdgeNarrative;
import org.opentripplanner.routing.core.State;
import org.opentripplanner.routing.core.TraverseOptions;
import org.opentripplanner.routing.core.Vertex;
public class WaitingEndsAtStopEdge extends AbstractEdge {
private final StopEntry _stop;
private final boolean _isReverseEdge;
public WaitingEndsAtStopEdge(GraphContext context, StopEntry stop,
boolean isReverseEdge) {
super(context);
_stop = stop;
_isReverseEdge = isReverseEdge;
}
@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);
return s0.edit(this, narrative).makeState();
}
private State traverseReverse(State s0) {
TraverseOptions options = s0.getOptions();
/**
* Only allow transition to a transit stop if transit is enabled
*/
if (!SupportLibrary.isTransitEnabled(options))
return null;
/**
* If we've already boarded a transit vehicle, we only allow additional
* boardings from a direct transfer. Note that we only apply this rule when
* doing reverse traversal of the graph. In a forward traversal, this edge
* traversal will be called in the optimization step where the number of
* boardings is greater than zero. However, we still want the traversal to
* proceed.
*/
if (_isReverseEdge && s0.getNumBoardings() > 0)
return null;
TransferPatternService tpService = _context.getTransferPatternService();
if (tpService.isEnabled())
return traverseBackTransferPatterns(s0, options);
EdgeNarrative narrative = createNarrative(s0);
return s0.edit(this, narrative).makeState();
}
@Override
public String toString() {
return "WaitingEndsAtStopEdge(stop=" + _stop.getId() + ")";
}
private EdgeNarrative createNarrative(State s0) {
ArrivalVertex fromVertex = new ArrivalVertex(_context, _stop, s0.getTime());
WalkFromStopVertex toVertex = new WalkFromStopVertex(_context, _stop);
return narrative(s0, fromVertex, toVertex);
}
private State traverseBackTransferPatterns(State s0, TraverseOptions options) {
if (!_isReverseEdge) {
Vertex fromVertex = null;
Vertex toVertex = new WalkFromStopVertex(_context, _stop);
EdgeNarrative narrative = narrative(s0, fromVertex, toVertex);
return s0.edit(this, narrative).makeState();
}
TransferPatternService tpService = _context.getTransferPatternService();
TPQueryData queryData = options.getExtension(TPQueryData.class);
List<StopEntry> sourceStops = queryData.getSourceStops();
State results = null;
Collection<TransferNode> trees = tpService.getReverseTransferPatternsForStops(
queryData.getTransferPatternData(), sourceStops, _stop);
for (TransferNode tree : trees) {
TPState pathState = TPState.end(queryData, tree);
Vertex fromVertex = new TPArrivalVertex(_context, pathState);
Vertex toVertex = new WalkFromStopVertex(_context, _stop);
EdgeNarrative narrative = narrative(s0, fromVertex, toVertex);
State r = s0.edit(this, narrative).makeState();
results = r.addToExistingResultChain(results);
}
return results;
}
}