/*
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 JSON_DESCRIPTOR_H_
#define JSON_DESCRIPTOR_H_
#include <algorithm>
#include "BaseDescriptor.h"
#include "DescriptionFactory.h"
#include "../Algorithms/ObjectToBase64.h"
#include "../DataStructures/SegmentInformation.h"
#include "../DataStructures/TurnInstructions.h"
#include "../Util/Azimuth.h"
#include "../Util/StringUtil.h"
template<class SearchEngineT>
class JSONDescriptor : public BaseDescriptor<SearchEngineT>{
private:
_DescriptorConfig config;
DescriptionFactory descriptionFactory;
DescriptionFactory alternateDescriptionFactory;
_Coordinate current;
unsigned numberOfEnteredRestrictedAreas;
struct {
int startIndex;
int nameID;
int leaveAtExit;
} roundAbout;
public:
JSONDescriptor() : numberOfEnteredRestrictedAreas(0) {}
void SetConfig(const _DescriptorConfig & c) { config = c; }
void Run(http::Reply & reply, const RawRouteData &rawRoute, PhantomNodes &phantomNodes, SearchEngineT &sEngine) {
WriteHeaderToOutput(reply.content);
if(rawRoute.lengthOfShortestPath != INT_MAX) {
descriptionFactory.SetStartSegment(phantomNodes.startPhantom);
reply.content += "0,"
"\"status_message\": \"Found route between points\",";
//Get all the coordinates for the computed route
BOOST_FOREACH(const _PathData & pathData, rawRoute.computedShortestPath) {
sEngine.GetCoordinatesForNodeID(pathData.node, current);
descriptionFactory.AppendSegment(current, pathData );
}
descriptionFactory.SetEndSegment(phantomNodes.targetPhantom);
} else {
//We do not need to do much, if there is no route ;-)
reply.content += "207,"
"\"status_message\": \"Cannot find route between points\",";
}
descriptionFactory.Run(sEngine, config.z, rawRoute.lengthOfShortestPath);
reply.content += "\"route_geometry\": ";
if(config.geometry) {
descriptionFactory.AppendEncodedPolylineString(reply.content, config.encodeGeometry);
} else {
reply.content += "[]";
}
reply.content += ","
"\"route_instructions\": [";
numberOfEnteredRestrictedAreas = 0;
if(config.instructions) {
BuildTextualDescription(descriptionFactory, reply, rawRoute.lengthOfShortestPath, sEngine);
} else {
BOOST_FOREACH(const SegmentInformation & segment, descriptionFactory.pathDescription) {
short currentInstruction = segment.turnInstruction & TurnInstructions.InverseAccessRestrictionFlag;
numberOfEnteredRestrictedAreas += (currentInstruction != segment.turnInstruction);
}
}
reply.content += "],";
descriptionFactory.BuildRouteSummary(descriptionFactory.entireLength, rawRoute.lengthOfShortestPath - ( numberOfEnteredRestrictedAreas*TurnInstructions.AccessRestrictionPenalty));
reply.content += "\"route_summary\":";
reply.content += "{";
reply.content += "\"total_distance\":";
reply.content += descriptionFactory.summary.lengthString;
reply.content += ","
"\"total_time\":";
reply.content += descriptionFactory.summary.durationString;
reply.content += ","
"\"start_point\":\"";
reply.content += sEngine.GetEscapedNameForNameID(descriptionFactory.summary.startName);
reply.content += "\","
"\"end_point\":\"";
reply.content += sEngine.GetEscapedNameForNameID(descriptionFactory.summary.destName);
reply.content += "\"";
reply.content += "}";
reply.content +=",";
//only one alternative route is computed at this time, so this is hardcoded
if(rawRoute.lengthOfAlternativePath != INT_MAX) {
alternateDescriptionFactory.SetStartSegment(phantomNodes.startPhantom);
//Get all the coordinates for the computed route
BOOST_FOREACH(const _PathData & pathData, rawRoute.computedAlternativePath) {
sEngine.GetCoordinatesForNodeID(pathData.node, current);
alternateDescriptionFactory.AppendSegment(current, pathData );
}
alternateDescriptionFactory.SetEndSegment(phantomNodes.targetPhantom);
}
alternateDescriptionFactory.Run(sEngine, config.z, rawRoute.lengthOfAlternativePath);
//give an array of alternative routes
reply.content += "\"alternative_geometries\": [";
if(config.geometry && INT_MAX != rawRoute.lengthOfAlternativePath) {
//Generate the linestrings for each alternative
alternateDescriptionFactory.AppendEncodedPolylineString(reply.content, config.encodeGeometry);
}
reply.content += "],";
reply.content += "\"alternative_instructions\":[";
numberOfEnteredRestrictedAreas = 0;
if(INT_MAX != rawRoute.lengthOfAlternativePath) {
reply.content += "[";
//Generate instructions for each alternative
if(config.instructions) {
BuildTextualDescription(alternateDescriptionFactory, reply, rawRoute.lengthOfAlternativePath, sEngine);
} else {
BOOST_FOREACH(const SegmentInformation & segment, alternateDescriptionFactory.pathDescription) {
short currentInstruction = segment.turnInstruction & TurnInstructions.InverseAccessRestrictionFlag;
numberOfEnteredRestrictedAreas += (currentInstruction != segment.turnInstruction);
}
}
reply.content += "]";
}
reply.content += "],";
reply.content += "\"alternative_summaries\":[";
if(INT_MAX != rawRoute.lengthOfAlternativePath) {
//Generate route summary (length, duration) for each alternative
alternateDescriptionFactory.BuildRouteSummary(alternateDescriptionFactory.entireLength, rawRoute.lengthOfAlternativePath - ( numberOfEnteredRestrictedAreas*TurnInstructions.AccessRestrictionPenalty));
reply.content += "{";
reply.content += "\"total_distance\":";
reply.content += alternateDescriptionFactory.summary.lengthString;
reply.content += ","
"\"total_time\":";
reply.content += alternateDescriptionFactory.summary.durationString;
reply.content += ","
"\"start_point\":\"";
reply.content += sEngine.GetEscapedNameForNameID(descriptionFactory.summary.startName);
reply.content += "\","
"\"end_point\":\"";
reply.content += sEngine.GetEscapedNameForNameID(descriptionFactory.summary.destName);
reply.content += "\"";
reply.content += "}";
}
reply.content += "],";
//list all viapoints so that the client may display it
reply.content += "\"via_points\":[";
std::string tmp;
if(config.geometry && INT_MAX != rawRoute.lengthOfShortestPath) {
for(unsigned i = 0; i < rawRoute.segmentEndCoordinates.size(); ++i) {
reply.content += "[";
if(rawRoute.segmentEndCoordinates[i].startPhantom.location.isSet())
convertInternalReversedCoordinateToString(rawRoute.segmentEndCoordinates[i].startPhantom.location, tmp);
else
convertInternalReversedCoordinateToString(rawRoute.rawViaNodeCoordinates[i], tmp);
reply.content += tmp;
reply.content += "],";
}
reply.content += "[";
if(rawRoute.segmentEndCoordinates.back().startPhantom.location.isSet())
convertInternalReversedCoordinateToString(rawRoute.segmentEndCoordinates.back().targetPhantom.location, tmp);
else
convertInternalReversedCoordinateToString(rawRoute.rawViaNodeCoordinates.back(), tmp);
reply.content += tmp;
reply.content += "]";
}
reply.content += "],";
reply.content += "\"hint_data\": {";
reply.content += "\"checksum\":";
intToString(rawRoute.checkSum, tmp);
reply.content += tmp;
reply.content += ", \"locations\": [";
std::string hint;
for(unsigned i = 0; i < rawRoute.segmentEndCoordinates.size(); ++i) {
reply.content += "\"";
EncodeObjectToBase64(rawRoute.segmentEndCoordinates[i].startPhantom, hint);
reply.content += hint;
reply.content += "\", ";
}
EncodeObjectToBase64(rawRoute.segmentEndCoordinates.back().targetPhantom, hint);
reply.content += "\"";
reply.content += hint;
reply.content += "\"]";
reply.content += "},";
reply.content += "\"transactionId\": \"OSRM Routing Engine JSON Descriptor (v0.3)\"";
reply.content += "}";
}
inline void WriteHeaderToOutput(std::string & output) {
output += "{"
"\"version\": 0.3,"
"\"status\":";
}
inline void BuildTextualDescription(DescriptionFactory & descriptionFactory, http::Reply & reply, const int lengthOfRoute, const SearchEngineT &sEngine) {
//Segment information has following format:
//["instruction","streetname",length,position,time,"length","earth_direction",azimuth]
//Example: ["Turn left","High Street",200,4,10,"200m","NE",22.5]
//See also: http://developers.cloudmade.com/wiki/navengine/JSON_format
unsigned prefixSumOfNecessarySegments = 0;
roundAbout.leaveAtExit = 0;
roundAbout.nameID = 0;
std::string tmpDist, tmpLength, tmpDuration, tmpBearing, tmpInstruction;
//Fetch data from Factory and generate a string from it.
BOOST_FOREACH(const SegmentInformation & segment, descriptionFactory.pathDescription) {
short currentInstruction = segment.turnInstruction & TurnInstructions.InverseAccessRestrictionFlag;
numberOfEnteredRestrictedAreas += (currentInstruction != segment.turnInstruction);
if(TurnInstructions.TurnIsNecessary( currentInstruction) ) {
if(TurnInstructions.EnterRoundAbout == currentInstruction) {
roundAbout.nameID = segment.nameID;
roundAbout.startIndex = prefixSumOfNecessarySegments;
} else {
if(0 != prefixSumOfNecessarySegments){
reply.content += ",";
}
reply.content += "[\"";
if(TurnInstructions.LeaveRoundAbout == currentInstruction) {
intToString(TurnInstructions.EnterRoundAbout, tmpInstruction);
reply.content += tmpInstruction;
reply.content += "-";
intToString(roundAbout.leaveAtExit+1, tmpInstruction);
reply.content += tmpInstruction;
roundAbout.leaveAtExit = 0;
} else {
intToString(currentInstruction, tmpInstruction);
reply.content += tmpInstruction;
}
reply.content += "\",\"";
reply.content += sEngine.GetEscapedNameForNameID(segment.nameID);
reply.content += "\",";
intToString(segment.length, tmpDist);
reply.content += tmpDist;
reply.content += ",";
intToString(prefixSumOfNecessarySegments, tmpLength);
reply.content += tmpLength;
reply.content += ",";
intToString(segment.duration/10, tmpDuration);
reply.content += tmpDuration;
reply.content += ",\"";
intToString(segment.length, tmpLength);
reply.content += tmpLength;
reply.content += "m\",\"";
reply.content += Azimuth::Get(segment.bearing);
reply.content += "\",";
intToString(round(segment.bearing), tmpBearing);
reply.content += tmpBearing;
reply.content += "]";
}
} else if(TurnInstructions.StayOnRoundAbout == currentInstruction) {
++roundAbout.leaveAtExit;
}
if(segment.necessary)
++prefixSumOfNecessarySegments;
}
if(INT_MAX != lengthOfRoute) {
reply.content += ",[\"";
intToString(TurnInstructions.ReachedYourDestination, tmpInstruction);
reply.content += tmpInstruction;
reply.content += "\",\"";
reply.content += "\",";
reply.content += "0";
reply.content += ",";
intToString(prefixSumOfNecessarySegments-1, tmpLength);
reply.content += tmpLength;
reply.content += ",";
reply.content += "0";
reply.content += ",\"";
reply.content += "\",\"";
reply.content += Azimuth::Get(0.0);
reply.content += "\",";
reply.content += "0.0";
reply.content += "]";
}
}
};
#endif /* JSON_DESCRIPTOR_H_ */