com.graphhopper.storage

Class CHGraphImpl

java.lang.Object

com.graphhopper.storage.CHGraphImpl

All Implemented Interfaces:

CHGraph, Graph, Storable<CHGraph>, Closeable, AutoCloseable

public class CHGraphImpl
extends Object
implements CHGraph, Storable<CHGraph>

A Graph implementation necessary for Contraction Hierarchies. This class enables the storage to hold the level of a node and shortcut edges per edge.

Author:

Peter Karich

Method Summary

Modifier and Type	Method and Description
void	close() This method makes sure that the underlying used resources are released.
Graph	copyTo(Graph g) Copy this Graph into the specified Graph g.
CHGraph	create(long bytes) Creates the underlying storage.
CHEdgeExplorer	createEdgeExplorer()
CHEdgeExplorer	createEdgeExplorer(EdgeFilter filter) Returns an EdgeExplorer which makes it possible to traverse all filtered edges of a specific node.
void	disconnect(CHEdgeExplorer explorer, EdgeIteratorState edgeState) Disconnects the edges (higher to lower node) via the specified edgeState pointing from lower to higher node.
CHEdgeIteratorState	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
void	flush() This method makes sure that the underlying data is written to the storage.
AllCHEdgesIterator	getAllEdges()
Graph	getBaseGraph()
BBox	getBounds() Returns the implicit bounds of this graph calculated from the lat,lon input of setNode
long	getCapacity()
CHEdgeIteratorState	getEdgeIteratorState(int edgeId, int endNode) Returns a wrapper over the specified edgeId.
GraphExtension	getExtension()
int	getLevel(int nodeIndex)
NodeAccess	getNodeAccess() Creates a node explorer to access node properties.
int	getNodes()
Weighting	getWeighting()
boolean	isClosed()
boolean	isShortcut(int edgeId)
protected int	loadEdgesHeader()
boolean	loadExisting()
protected int	nextShortcutId()
protected int	setEdgesHeader()
void	setLevel(int nodeIndex, int level) This methods sets the level of the specified node.
CHEdgeIteratorState	shortcut(int a, int b) This method creates a shortcut between a to b which is nearly identical to creating an edge except that it can be excluded or included for certain traversals or algorithms.
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

getWeighting

public final Weighting getWeighting()

isShortcut

public boolean isShortcut(int edgeId)

Specified by:

isShortcut in interface CHGraph

setLevel

public final void setLevel(int nodeIndex,
                           int level)

Description copied from interface: CHGraph

This methods sets the level of the specified node.

Specified by:

setLevel in interface CHGraph

getLevel

public final int getLevel(int nodeIndex)

Specified by:

getLevel in interface CHGraph

Returns:

the level of the specified node. The higher the more important the node is. Virtual nodes have the biggest level associated.

shortcut

public CHEdgeIteratorState shortcut(int a,
                                    int b)

Description copied from interface: CHGraph

This method creates a shortcut between a to b which is nearly identical to creating an edge except that it can be excluded or included for certain traversals or algorithms.

Specified by:

shortcut in interface CHGraph

nextShortcutId

protected int nextShortcutId()

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

edge

public CHEdgeIteratorState 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

createEdgeExplorer

public CHEdgeExplorer createEdgeExplorer()

Specified by:

createEdgeExplorer in interface CHGraph

Specified by:

createEdgeExplorer in interface Graph

See Also:

Graph.createEdgeExplorer(com.graphhopper.routing.util.EdgeFilter)

createEdgeExplorer

public CHEdgeExplorer createEdgeExplorer(EdgeFilter filter)

Description copied from interface: Graph

Returns an EdgeExplorer which makes it possible to traverse all filtered edges of a specific node. Reduce calling this method as much as possible, e.g. create an explorer before a for loop!

Specified by:

createEdgeExplorer in interface CHGraph

Specified by:

createEdgeExplorer in interface Graph

See Also:

EdgeExplorer, Graph.createEdgeExplorer()

getEdgeIteratorState

public final CHEdgeIteratorState getEdgeIteratorState(int edgeId,
                                                      int endNode)

Description copied from interface: Graph

Returns a wrapper over the specified edgeId.

Specified by:

getEdgeIteratorState in interface CHGraph

Specified by:

getEdgeIteratorState in interface Graph

endNode - is the node that will be returned via adjNode(). If adjNode is Integer.MIN_VALUE then the edge with uncertain values for adjNode and baseNode (two possibilities) will be returned.

Returns:

an edge iterator state or potentially null if adjNode does not match

getNodes

public int getNodes()

Specified by:

getNodes in interface Graph

Returns:

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

getNodeAccess

public NodeAccess getNodeAccess()

Description copied from interface: Graph

Creates a node explorer 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

disconnect

public void disconnect(CHEdgeExplorer explorer,
                       EdgeIteratorState edgeState)

Disconnects the edges (higher to lower node) via the specified edgeState pointing from lower to higher node.

Parameters:

edgeState - the edge from lower to higher

getAllEdges

public AllCHEdgesIterator getAllEdges()

Specified by:

getAllEdges in interface CHGraph

Specified by:

getAllEdges in interface Graph

Returns:

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

loadEdgesHeader

protected int loadEdgesHeader()

setEdgesHeader

protected int setEdgesHeader()

getExtension

public GraphExtension getExtension()

Specified by:

getExtension in interface Graph

Returns:

the graph extension like a TurnCostExtension

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.

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

create

public CHGraph create(long bytes)

Description copied from interface: Storable

Creates the underlying storage. First operation if it cannot be loaded.

Specified by:

create in interface Storable<CHGraph>

loadExisting

public boolean loadExisting()

Specified by:

loadExisting in interface Storable<CHGraph>

Returns:

true if successfully loaded from persistent storage.

flush

public void flush()

Description copied from interface: Storable

This method makes sure that the underlying data is written to the storage. Keep in mind that a disc normally has an IO cache so that flush() is (less) probably not save against power loses.

Specified by:

flush in interface Storable<CHGraph>

close

public void close()

Description copied from interface: Storable

This method makes sure that the underlying used resources are released. WARNING: it does NOT flush on close!

Specified by:

close in interface Storable<CHGraph>

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

isClosed

public boolean isClosed()

Specified by:

isClosed in interface Storable<CHGraph>

getCapacity

public long getCapacity()

Specified by:

getCapacity in interface Storable<CHGraph>

Returns:

the allocated storage size in bytes

toString

public String toString()

Overrides:

toString in class Object