Package org.geotools.graph.build.line

Class OptDirectedLineGraphGenerator

Object

OptLineGraphGenerator

OptDirectedLineGraphGenerator

All Implemented Interfaces:

GraphGenerator, LineGraphGenerator

public class OptDirectedLineGraphGenerator
extends OptLineGraphGenerator

An implementation of GraphGenerator used to generate an optimized graph representing a line network. Graphs are generated by supplying the generator with objects of type LineSegment via the add(Object) method.

For each line segment added, an edge in the graph is created. The builder records the end coordinates of each line added, and maintains a map of coordinates to nodes, creating nodes when neccessary.

Edges created by the generator are of type OptBasicEdge. Nodes created by the generator are of type OptXYNode.

Author:

Justin Deoliveira, Refractions Research Inc, jdeolive@refractions.net

See Also:

• OptEdge
• OptXYNode

Constructor Summary

Constructors

Constructor	Description
OptDirectedLineGraphGenerator()	Constructs a new OptLineGraphGenerator.

Method Summary

Modifier and Type	Method	Description
Graphable	add(Object obj)	Adds a line to the graph.
protected Edge	generateEdge(LineSegment line)
protected void	generateNodes()
Edge	getEdge(Coordinate c1, Coordinate c2)	Retrieve edge between the two coordinates.
Map<Coordinate,Object>	getInNodeMap()	Returns the coordinate to in node map.
Node	getNode(Coordinate c)	Look up a Node for the provided coordinate.
Map<Coordinate,Object>	getOutNodeMap()	Returns the coordinate to out node map.

Methods inherited from class OptLineGraphGenerator

generate, generateEdges, get, getGraph, getGraphBuilder, getLines, getNodeMap, remove, setGraphBuilder

Methods inherited from class Object

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

Constructor Details

OptDirectedLineGraphGenerator

public OptDirectedLineGraphGenerator()

Constructs a new OptLineGraphGenerator.

Method Details

add

public Graphable add(Object obj)

Adds a line to the graph. Note that this method returns null since actual building of the graph components is delayed until generate() is called.

Specified by:

add in interface GraphGenerator

Overrides:

add in class OptLineGraphGenerator

Parameters:

obj - A LineSegment object.

Returns:

null because the actual building of the graph components is delayed until generate() is called.

getInNodeMap

public Map<Coordinate,Object> getInNodeMap()

Returns the coordinate to in node map. Note that before the call to generate the map does not contain any nodes.

Returns:

Coordinate to in node map.

getOutNodeMap

public Map<Coordinate,Object> getOutNodeMap()

Returns the coordinate to out node map. Note that before the call to generate the map does not contain any nodes.

Returns:

Coordinate to out node map.

generateNodes

protected void generateNodes()

Overrides:

generateNodes in class OptLineGraphGenerator

generateEdge

protected Edge generateEdge(LineSegment line)

Overrides:

generateEdge in class OptLineGraphGenerator

getNode

public Node getNode(Coordinate c)

Description copied from interface: LineGraphGenerator

Look up a Node for the provided coordinate.

Specified by:

getNode in interface LineGraphGenerator

Overrides:

getNode in class OptLineGraphGenerator

Returns:

Node

getEdge

public Edge getEdge(Coordinate c1,
 Coordinate c2)

Description copied from interface: LineGraphGenerator

Retrieve edge between the two coordinates.

Specified by:

getEdge in interface LineGraphGenerator

Overrides:

getEdge in class OptLineGraphGenerator

Returns:

Edge