com.graphhopper.reader.osm

Class OSMReader

java.lang.Object

com.graphhopper.reader.osm.OSMReader

All Implemented Interfaces:

DataReader

public class OSMReader
extends Object
implements DataReader

This class parses an OSM xml or pbf file and creates a graph from it. It does so in a two phase parsing processes in order to reduce memory usage compared to a single parsing processing.

1. a) Reads ways from OSM file and stores all associated node ids in osmNodeIdToInternalNodeMap. If a node occurs once it is a pillar node and if more it is a tower node, otherwise osmNodeIdToInternalNodeMap returns EMPTY.

1. b) Reads relations from OSM file. In case that the relation is a route relation, it stores specific relation attributes required for routing into osmWayIdToRouteWeightMap for all the ways of the relation.

2.a) Reads nodes from OSM file and stores lat+lon information either into the intermediate data structure for the pillar nodes (pillarLats/pillarLons) or, if a tower node, directly into the graphStorage via setLatitude/setLongitude. It can also happen that a pillar node needs to be transformed into a tower node e.g. via barriers or different speed values for one way.

2.b) Reads ways from OSM file and creates edges while calculating the speed etc from the OSM tags. When creating an edge the pillar node information from the intermediate data structure will be stored in the way geometry of that edge.

Author:

Peter Karich

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	EMPTY_NODE
protected static int	PILLAR_NODE
protected PillarInfo	pillarInfo
protected static int	TOWER_NODE
protected long	zeroCounter

Constructor Summary

Constructors

Constructor and Description
OSMReader(GraphHopperStorage ghStorage)

Method Summary

Modifier and Type	Method and Description
Collection<OSMTurnRelation.TurnCostTableEntry>	analyzeTurnRelation(FlagEncoder encoder, OSMTurnRelation turnRelation)
Collection<OSMTurnRelation.TurnCostTableEntry>	analyzeTurnRelation(OSMTurnRelation turnRelation)
protected void	finishedReading()
Date	getDataDate()
protected double	getElevation(ReaderNode node)
int	getInternalNodeIdOfOsmNode(long nodeOsmId)
protected com.carrotsearch.hppc.LongLongMap	getNodeFlagsMap()
protected LongIntMap	getNodeMap() Maps OSM IDs (long) to internal node IDs (int)
long	getOsmIdOfInternalEdge(int edgeId)
protected OSMInput	openOsmInputFile(File osmFile)
void	processRelation(ReaderRelation relation)
void	readGraph()
void	setCreateStorage(boolean createStorage) Per default the storage used in this OSMReader is uninitialized and created i.e.
OSMReader	setElevationProvider(ElevationProvider eleProvider)
DataReader	setFile(File osmFile)
DataReader	setSmoothElevation(boolean smoothElevation)
OSMReader	setWayPointMaxDistance(double maxDist)
OSMReader	setWorkerThreads(int numOfWorkers)
protected void	storeOsmWayID(int edgeId, long osmWayId) Stores only osmWayIds which are required for relations
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

EMPTY_NODE

protected static final int EMPTY_NODE

See Also:

Constant Field Values

PILLAR_NODE

protected static final int PILLAR_NODE

See Also:

Constant Field Values

TOWER_NODE

protected static final int TOWER_NODE

See Also:

Constant Field Values

zeroCounter

protected long zeroCounter

pillarInfo

protected PillarInfo pillarInfo

Constructor Detail

OSMReader

public OSMReader(GraphHopperStorage ghStorage)

Method Detail

readGraph

public void readGraph()
               throws IOException

Specified by:

readGraph in interface DataReader

Throws:

IOException

openOsmInputFile

protected OSMInput openOsmInputFile(File osmFile)
                             throws XMLStreamException,
                                    IOException

Throws:

XMLStreamException

IOException

processRelation

public void processRelation(ReaderRelation relation)

analyzeTurnRelation

public Collection<OSMTurnRelation.TurnCostTableEntry> analyzeTurnRelation(OSMTurnRelation turnRelation)

analyzeTurnRelation

public Collection<OSMTurnRelation.TurnCostTableEntry> analyzeTurnRelation(FlagEncoder encoder,
                                                                          OSMTurnRelation turnRelation)

getOsmIdOfInternalEdge

public long getOsmIdOfInternalEdge(int edgeId)

Returns:

OSM way ID from specified edgeId. Only previously stored OSM-way-IDs are returned in order to reduce memory overhead.

getInternalNodeIdOfOsmNode

public int getInternalNodeIdOfOsmNode(long nodeOsmId)

getElevation

protected double getElevation(ReaderNode node)

storeOsmWayID

protected void storeOsmWayID(int edgeId,
                             long osmWayId)

Stores only osmWayIds which are required for relations

finishedReading

protected void finishedReading()

getNodeMap

protected LongIntMap getNodeMap()

Maps OSM IDs (long) to internal node IDs (int)

getNodeFlagsMap

protected com.carrotsearch.hppc.LongLongMap getNodeFlagsMap()

setWayPointMaxDistance

public OSMReader setWayPointMaxDistance(double maxDist)

Specified by:

setWayPointMaxDistance in interface DataReader

setSmoothElevation

public DataReader setSmoothElevation(boolean smoothElevation)

Specified by:

setSmoothElevation in interface DataReader

setWorkerThreads

public OSMReader setWorkerThreads(int numOfWorkers)

Specified by:

setWorkerThreads in interface DataReader

setElevationProvider

public OSMReader setElevationProvider(ElevationProvider eleProvider)

Specified by:

setElevationProvider in interface DataReader

setFile

public DataReader setFile(File osmFile)

Specified by:

setFile in interface DataReader

getDataDate

public Date getDataDate()

Specified by:

getDataDate in interface DataReader

setCreateStorage

public void setCreateStorage(boolean createStorage)

Per default the storage used in this OSMReader is uninitialized and created i.e. createStorage is true. Specify false if you call the create method outside of OSMReader.

toString

public String toString()

Overrides:

toString in class Object