/*
open source routing machine
Copyright (C) Dennis Luxen, others 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU AFFERO General Public License as published by
the Free Software Foundation; either version 3 of the License, or
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
or see http://www.gnu.org/licenses/agpl.txt.
*/
#ifndef SHORTESTPATHROUTING_H_
#define SHORTESTPATHROUTING_H_
#include "BasicRoutingInterface.h"
template<class QueryDataT>
class ShortestPathRouting : public BasicRoutingInterface<QueryDataT>{
typedef BasicRoutingInterface<QueryDataT> super;
typedef typename QueryDataT::QueryHeap QueryHeap;
public:
ShortestPathRouting( QueryDataT & qd) : super(qd) {}
~ShortestPathRouting() {}
void operator()(std::vector<PhantomNodes> & phantomNodesVector, RawRouteData & rawRouteData) const {
BOOST_FOREACH(const PhantomNodes & phantomNodePair, phantomNodesVector) {
if(!phantomNodePair.AtLeastOnePhantomNodeIsUINTMAX()) {
rawRouteData.lengthOfShortestPath = rawRouteData.lengthOfAlternativePath = INT_MAX;
return;
}
}
int distance1 = 0;
int distance2 = 0;
bool searchFrom1stStartNode = true;
bool searchFrom2ndStartNode = true;
NodeID middle1 = UINT_MAX;
NodeID middle2 = UINT_MAX;
std::vector<NodeID> packedPath1;
std::vector<NodeID> packedPath2;
super::_queryData.InitializeOrClearFirstThreadLocalStorage();
super::_queryData.InitializeOrClearSecondThreadLocalStorage();
super::_queryData.InitializeOrClearThirdThreadLocalStorage();
QueryHeap & forward_heap1 = *(super::_queryData.forwardHeap);
QueryHeap & reverse_heap1 = *(super::_queryData.backwardHeap);
QueryHeap & forward_heap2 = *(super::_queryData.forwardHeap2);
QueryHeap & reverse_heap2 = *(super::_queryData.backwardHeap2);
//Get distance to next pair of target nodes.
BOOST_FOREACH(const PhantomNodes & phantomNodePair, phantomNodesVector) {
forward_heap1.Clear(); forward_heap2.Clear();
reverse_heap1.Clear(); reverse_heap2.Clear();
int _localUpperbound1 = INT_MAX;
int _localUpperbound2 = INT_MAX;
middle1 = UINT_MAX;
middle2 = UINT_MAX;
//insert new starting nodes into forward heap, adjusted by previous distances.
if(searchFrom1stStartNode) {
forward_heap1.Insert(phantomNodePair.startPhantom.edgeBasedNode, -phantomNodePair.startPhantom.weight1, phantomNodePair.startPhantom.edgeBasedNode);
// INFO("fw1: " << phantomNodePair.startPhantom.edgeBasedNode << "´, w: " << -phantomNodePair.startPhantom.weight1);
forward_heap2.Insert(phantomNodePair.startPhantom.edgeBasedNode, -phantomNodePair.startPhantom.weight1, phantomNodePair.startPhantom.edgeBasedNode);
// INFO("fw2: " << phantomNodePair.startPhantom.edgeBasedNode << "´, w: " << -phantomNodePair.startPhantom.weight1);
}
if(phantomNodePair.startPhantom.isBidirected() && searchFrom2ndStartNode) {
forward_heap1.Insert(phantomNodePair.startPhantom.edgeBasedNode+1, -phantomNodePair.startPhantom.weight2, phantomNodePair.startPhantom.edgeBasedNode+1);
// INFO("fw1: " << phantomNodePair.startPhantom.edgeBasedNode+1 << "´, w: " << -phantomNodePair.startPhantom.weight2);
forward_heap2.Insert(phantomNodePair.startPhantom.edgeBasedNode+1, -phantomNodePair.startPhantom.weight2, phantomNodePair.startPhantom.edgeBasedNode+1);
// INFO("fw2: " << phantomNodePair.startPhantom.edgeBasedNode+1 << "´, w: " << -phantomNodePair.startPhantom.weight2);
}
//insert new backward nodes into backward heap, unadjusted.
reverse_heap1.Insert(phantomNodePair.targetPhantom.edgeBasedNode, phantomNodePair.targetPhantom.weight1, phantomNodePair.targetPhantom.edgeBasedNode);
// INFO("rv1: " << phantomNodePair.targetPhantom.edgeBasedNode << ", w;" << phantomNodePair.targetPhantom.weight1 );
if(phantomNodePair.targetPhantom.isBidirected() ) {
reverse_heap2.Insert(phantomNodePair.targetPhantom.edgeBasedNode+1, phantomNodePair.targetPhantom.weight2, phantomNodePair.targetPhantom.edgeBasedNode+1);
// INFO("rv2: " << phantomNodePair.targetPhantom.edgeBasedNode+1 << ", w;" << phantomNodePair.targetPhantom.weight2 );
}
const int forward_offset = phantomNodePair.startPhantom.weight1 + (phantomNodePair.startPhantom.isBidirected() ? phantomNodePair.startPhantom.weight2 : 0);
const int reverse_offset = phantomNodePair.targetPhantom.weight1 + (phantomNodePair.targetPhantom.isBidirected() ? phantomNodePair.targetPhantom.weight2 : 0);
//run two-Target Dijkstra routing step.
while(0 < (forward_heap1.Size() + reverse_heap1.Size() )){
if(0 < forward_heap1.Size()){
super::RoutingStep(forward_heap1, reverse_heap1, &middle1, &_localUpperbound1, forward_offset, true);
}
if(0 < reverse_heap1.Size() ){
super::RoutingStep(reverse_heap1, forward_heap1, &middle1, &_localUpperbound1, reverse_offset, false);
}
}
if(0 < reverse_heap2.Size()) {
while(0 < (forward_heap2.Size() + reverse_heap2.Size() )){
if(0 < forward_heap2.Size()){
super::RoutingStep(forward_heap2, reverse_heap2, &middle2, &_localUpperbound2, forward_offset, true);
}
if(0 < reverse_heap2.Size()){
super::RoutingStep(reverse_heap2, forward_heap2, &middle2, &_localUpperbound2, reverse_offset, false);
}
}
}
//No path found for both target nodes?
if((INT_MAX == _localUpperbound1) && (INT_MAX == _localUpperbound2)) {
rawRouteData.lengthOfShortestPath = rawRouteData.lengthOfAlternativePath = INT_MAX;
return;
}
if(UINT_MAX == middle1) {
searchFrom1stStartNode = false;
}
if(UINT_MAX == middle2) {
searchFrom2ndStartNode = false;
}
//Was at most one of the two paths not found?
assert(!(INT_MAX == distance1 && INT_MAX == distance2));
//Unpack paths if they exist
std::vector<NodeID> temporaryPackedPath1;
std::vector<NodeID> temporaryPackedPath2;
if(INT_MAX != _localUpperbound1) {
super::RetrievePackedPathFromHeap(forward_heap1, reverse_heap1, middle1, temporaryPackedPath1);
}
if(INT_MAX != _localUpperbound2) {
super::RetrievePackedPathFromHeap(forward_heap2, reverse_heap2, middle2, temporaryPackedPath2);
}
//if one of the paths was not found, replace it with the other one.
if(0 == temporaryPackedPath1.size()) {
temporaryPackedPath1.insert(temporaryPackedPath1.end(), temporaryPackedPath2.begin(), temporaryPackedPath2.end());
_localUpperbound1 = _localUpperbound2;
}
if(0 == temporaryPackedPath2.size()) {
temporaryPackedPath2.insert(temporaryPackedPath2.end(), temporaryPackedPath1.begin(), temporaryPackedPath1.end());
_localUpperbound2 = _localUpperbound1;
}
assert(0 < temporaryPackedPath1.size() && 0 < temporaryPackedPath2.size());
//Plug paths together, s.t. end of packed path is begin of temporary packed path
if(0 < packedPath1.size() && 0 < packedPath2.size() ) {
if( *(temporaryPackedPath1.begin()) == *(temporaryPackedPath2.begin())) {
//both new route segments start with the same node, thus one of the packedPath must go.
assert( (packedPath1.size() == packedPath2.size() ) || (*(packedPath1.end()-1) != *(packedPath2.end()-1)) );
if( *(packedPath1.end()-1) == *(temporaryPackedPath1.begin())) {
packedPath2.clear();
packedPath2.insert(packedPath2.end(), packedPath1.begin(), packedPath1.end());
distance2 = distance1;
} else {
packedPath1.clear();
packedPath1.insert(packedPath1.end(), packedPath2.begin(), packedPath2.end());
distance1 = distance2;
}
} else {
//packed paths 1 and 2 may need to switch.
if(*(packedPath1.end()-1) != *(temporaryPackedPath1.begin())) {
packedPath1.swap(packedPath2);
std::swap(distance1, distance2);
}
}
}
packedPath1.insert(packedPath1.end(), temporaryPackedPath1.begin(), temporaryPackedPath1.end());
packedPath2.insert(packedPath2.end(), temporaryPackedPath2.begin(), temporaryPackedPath2.end());
if( (packedPath1.back() == packedPath2.back()) && phantomNodePair.targetPhantom.isBidirected() ) {
NodeID lastNodeID = packedPath2.back();
searchFrom1stStartNode &= !(lastNodeID == phantomNodePair.targetPhantom.edgeBasedNode+1);
searchFrom2ndStartNode &= !(lastNodeID == phantomNodePair.targetPhantom.edgeBasedNode);
}
distance1 += _localUpperbound1;
distance2 += _localUpperbound2;
}
if(distance1 > distance2){
std::swap(packedPath1, packedPath2);
}
remove_consecutive_duplicates_from_vector(packedPath1);
super::UnpackPath(packedPath1, rawRouteData.computedShortestPath);
rawRouteData.lengthOfShortestPath = std::min(distance1, distance2);
return;
}
};
#endif /* SHORTESTPATHROUTING_H_ */