com.graphhopper.routing.querygraph

Class QueryGraph

java.lang.Object

com.graphhopper.routing.querygraph.QueryGraph

All Implemented Interfaces:

Graph

public class QueryGraph
extends Object
implements Graph

A class which is used to query the underlying graph with real GPS points. It does so by introducing virtual nodes and edges. It is lightweight in order to be created every time a new query comes in, which makes the behaviour thread safe.

Calling any create method creates virtual edges between the tower nodes of the existing graph and new virtual tower nodes. Every virtual node has two adjacent nodes and is connected to each adjacent nodes via 2 virtual edges with opposite base node / adjacent node encoding. However, the edge explorer returned by Graph.createEdgeExplorer() only returns two virtual edges per virtual node (the ones with correct base node).

Author:

Peter Karich

Method Summary

Modifier and Type	Method and Description
void	clearUnfavoredStatus() Removes the 'unfavored' status of all virtual edges.
Graph	copyTo(Graph g) Copy this Graph into the specified Graph g.
static QueryGraph	create(Graph graph, List<Snap> snaps)
static QueryGraph	create(Graph graph, Snap snap)
static QueryGraph	create(Graph graph, Snap fromSnap, Snap toSnap)
EdgeExplorer	createEdgeExplorer(EdgeFilter edgeFilter) Returns an EdgeExplorer which makes it possible to traverse all filtered edges of a specific node.
EdgeIteratorState	edge(int a, int b) Creates an edge between the nodes a and b.
EdgeIteratorState	edge(int a, int b, double distance, boolean bothDirections) Use edge(a,b).setDistance().setFlags instead
AllEdgesIterator	getAllEdges()
Graph	getBaseGraph()
BBox	getBounds() Returns the implicit bounds of this graph calculated from the lat,lon input of setNode
EdgeIteratorState	getEdgeIteratorState(int origEdgeId, int adjNode) Returns a wrapper over the specified edgeId.
int	getEdges()
NodeAccess	getNodeAccess() Creates an object to access node properties.
int	getNodes()
int	getOtherNode(int edge, int node)
com.graphhopper.routing.querygraph.QueryOverlay	getQueryOverlay()
TurnCostStorage	getTurnCostStorage()
Set<EdgeIteratorState>	getUnfavoredVirtualEdges() Returns all virtual edges that have been unfavored via unfavorVirtualEdge(int) or unfavorVirtualEdges(IntArrayList)
boolean	isAdjacentToNode(int edge, int node)
boolean	isVirtualEdge(int edgeId)
boolean	isVirtualNode(int nodeId)
void	unfavorVirtualEdge(int virtualEdgeId) Assigns the 'unfavored' flag to a virtual edge (for both directions)
void	unfavorVirtualEdges(com.carrotsearch.hppc.IntArrayList edgeIds)
Weighting	wrapWeighting(Weighting weighting) Wraps the given weighting into a weighting that can be used by this graph

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.graphhopper.storage.Graph

createEdgeExplorer

Method Detail

create

public static QueryGraph create(Graph graph,
                                Snap snap)

create

public static QueryGraph create(Graph graph,
                                Snap fromSnap,
                                Snap toSnap)

create

public static QueryGraph create(Graph graph,
                                List<Snap> snaps)

getQueryOverlay

public com.graphhopper.routing.querygraph.QueryOverlay getQueryOverlay()

getBaseGraph

public Graph getBaseGraph()

Specified by:

getBaseGraph in interface Graph

Returns:

a graph which behaves like an unprepared graph and e.g. the normal unidirectional Dijkstra or any graph traversal algorithm can be executed.

isVirtualEdge

public boolean isVirtualEdge(int edgeId)

isVirtualNode

public boolean isVirtualNode(int nodeId)

unfavorVirtualEdges

public void unfavorVirtualEdges(com.carrotsearch.hppc.IntArrayList edgeIds)

unfavorVirtualEdge

public void unfavorVirtualEdge(int virtualEdgeId)

Assigns the 'unfavored' flag to a virtual edge (for both directions)

getUnfavoredVirtualEdges

public Set<EdgeIteratorState> getUnfavoredVirtualEdges()

Returns all virtual edges that have been unfavored via unfavorVirtualEdge(int) or unfavorVirtualEdges(IntArrayList)

clearUnfavoredStatus

public void clearUnfavoredStatus()

Removes the 'unfavored' status of all virtual edges.

getNodes

public int getNodes()

Specified by:

getNodes in interface Graph

Returns:

the number of created locations - via setNode() or edge()

getEdges

public int getEdges()

Specified by:

getEdges in interface Graph

Returns:

the number of edges in this graph. Equivalent to getAllEdges().length().

getNodeAccess

public NodeAccess getNodeAccess()

Description copied from interface: Graph

Creates an object to access node properties.

Specified by:

getNodeAccess in interface Graph

getBounds

public BBox getBounds()

Description copied from interface: Graph

Returns the implicit bounds of this graph calculated from the lat,lon input of setNode

Specified by:

getBounds in interface Graph

getEdgeIteratorState

public EdgeIteratorState getEdgeIteratorState(int origEdgeId,
                                              int adjNode)

Description copied from interface: Graph

Returns a wrapper over the specified edgeId.

Specified by:

getEdgeIteratorState in interface Graph

adjNode - is the node that will be returned via getAdjNode(). If adjNode is Integer.MIN_VALUE then the edge will be returned in the direction of how it is stored

Returns:

a new EdgeIteratorState object or potentially null if adjNode does not match

createEdgeExplorer

public EdgeExplorer createEdgeExplorer(EdgeFilter edgeFilter)

Description copied from interface: Graph

Returns an EdgeExplorer which makes it possible to traverse all filtered edges of a specific node. Calling this method might be expensive, so e.g. create an explorer before a for loop!

Specified by:

createEdgeExplorer in interface Graph

getAllEdges

public AllEdgesIterator getAllEdges()

Specified by:

getAllEdges in interface Graph

Returns:

all edges in this graph, where baseNode will be the smaller node.

edge

public EdgeIteratorState edge(int a,
                              int b)

Description copied from interface: Graph

Creates an edge between the nodes a and b. To set distance or access use the returned edge and e.g. edgeState.setDistance

Specified by:

edge in interface Graph

Parameters:

a - the index of the starting (tower) node of the edge

b - the index of the ending (tower) node of the edge

Returns:

the newly created edge

edge

public EdgeIteratorState edge(int a,
                              int b,
                              double distance,
                              boolean bothDirections)

Description copied from interface: Graph

Use edge(a,b).setDistance().setFlags instead

Specified by:

edge in interface Graph

copyTo

public Graph copyTo(Graph g)

Description copied from interface: Graph

Copy this Graph into the specified Graph g.

Specified by:

copyTo in interface Graph

Returns:

the specified Graph g

getTurnCostStorage

public TurnCostStorage getTurnCostStorage()

Specified by:

getTurnCostStorage in interface Graph

Returns:

the TurnCostStorage or null if not supported

wrapWeighting

public Weighting wrapWeighting(Weighting weighting)

Description copied from interface: Graph

Wraps the given weighting into a weighting that can be used by this graph

Specified by:

wrapWeighting in interface Graph

getOtherNode

public int getOtherNode(int edge,
                        int node)

Specified by:

getOtherNode in interface Graph

Returns:

the 'opposite' node of a given edge, so if there is an edge 3-2 and node =2 this returns 3

isAdjacentToNode

public boolean isAdjacentToNode(int edge,
                                int node)

Specified by:

isAdjacentToNode in interface Graph

Returns:

true if the edge with id edge is adjacent to node, false otherwise