org.geotools.graph.structure.basic

Class BasicGraph

Object

BasicGraph

All Implemented Interfaces:

Serializable, Graph

Direct Known Subclasses:

BasicDirectedGraph

public class BasicGraph
extends Object
implements Graph, Serializable

Basic implemenation of Graph.

Author:

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

See Also:

Graph, Serialized Form

Field Summary

Fields inherited from interface Graph

FAIL_QUERY, PASS_AND_CONTINUE, PASS_AND_STOP

Constructor Summary

Constructors

Constructor and Description
BasicGraph() Constructs an empty graph with edge and node collections uninitialized.
BasicGraph(Collection<Node> nodes, Collection<Edge> edges) Constructs a graph from a collection of nodes and a collection of edges.

Method Summary

Modifier and Type	Method and Description
Collection<Edge>	getEdges() Returns the edges of the graph.
Collection<Node>	getNodes() Returns the nodes of the graph.
List<Node>	getNodesOfDegree(int n) Returns all the nodes in the graph of a specified degree.
List<Edge>	getVisitedEdges(boolean visited) Returns all the edges in the graph that have been marked as visited or non-visited.
List<Node>	getVisitedNodes(boolean visited) Returns all the nodes in the graph that have been marked as visited or non-visited.
void	initEdges() Initializes the edges in the graph by setting all visited flags to false and all visited counts to zero.
void	initNodes() Initializes the nodes in the graph by setting all visited flags to false and all visited counts to zero.
List<Edge>	queryEdges(GraphVisitor visitor) Performs a query against the edges of the graph.
List<Node>	queryNodes(GraphVisitor visitor) Performs a query against the nodes of the graph.
void	setEdges(Collection<Edge> edges) Sets the edge collection for the graph.
void	setNodes(Collection<Node> nodes) Sets the node collection of the graph.
String	toString() Returns the string representation of the graph which is just the string representation of the edge and node collections.
void	visitEdges(GraphVisitor visitor) Applies the visitor pattern to the edges of the graph.
void	visitNodes(GraphVisitor visitor) Applies the visitor pattern to the nodes of the graph.

Methods inherited from class Object

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

Constructor Detail

BasicGraph

public BasicGraph()

Constructs an empty graph with edge and node collections uninitialized. Mainly for serializability purposes.

BasicGraph

public BasicGraph(Collection<Node> nodes,
                  Collection<Edge> edges)

Constructs a graph from a collection of nodes and a collection of edges. The relationships between the nodes (edges) are already assumed to be formed. Only the references to the node and edge collections are copied, not the underlying collections themselves.

Parameters:

nodes - Collection of nodes to be contained by the graph.

edges - Collection of edges to be contained by the graph.

Method Detail

setNodes

public void setNodes(Collection<Node> nodes)

Sets the node collection of the graph.

Parameters:

nodes - Collection of Node objects.

getNodes

public Collection<Node> getNodes()

Description copied from interface: Graph

Returns the nodes of the graph.

Specified by:

getNodes in interface Graph

Returns:

A collection of Node objects.

See Also:

Graph.getNodes()

setEdges

public void setEdges(Collection<Edge> edges)

Sets the edge collection for the graph.

Parameters:

edges - Collection of Edge objects.

getEdges

public Collection<Edge> getEdges()

Description copied from interface: Graph

Returns the edges of the graph.

Specified by:

getEdges in interface Graph

Returns:

A collection of Edge objects.

See Also:

Graph.getEdges()

queryNodes

public List<Node> queryNodes(GraphVisitor visitor)

Description copied from interface: Graph

Performs a query against the nodes of the graph. Each Node object contained in the graph is passed to a GraphVisitor to determine if it meets the query criteria.

Specified by:

queryNodes in interface Graph

Parameters:

visitor - Determines if node meets query criteria. Returns MEET_AND_CONTINUE to signal that the node meets the query criteria and the query should continue.
Returns MEET_AND_STOP to signal that the node meest the query criteria and the query should stop.
FAIL_QUERY to signal that the node does NOT meet the query criteria.

Returns:

A collection of nodes that meet the query criteria.

See Also:

Graph.queryNodes(GraphVisitor)

queryEdges

public List<Edge> queryEdges(GraphVisitor visitor)

Description copied from interface: Graph

Performs a query against the edges of the graph. Each Edge object contained in the graph is passed to a GraphVisitor to determine if it meets the query criteria.

Specified by:

queryEdges in interface Graph

Parameters:

visitor - Determines if the meets the query criteria.
Returns MEET_AND_CONTINUE to signal that the edge meets the query criteria and the query should continue.
Returns MEET_AND_STOP to signal that the edge meest the query criteria and the query should stop.
FAIL_QUERY to signal that the edge does NOT meet the query criteria.

Returns:

A collection of edges that meet the query criteria.

See Also:

Graph.queryEdges(GraphVisitor)

visitNodes

public void visitNodes(GraphVisitor visitor)

Description copied from interface: Graph

Applies the visitor pattern to the nodes of the graph.

Specified by:

visitNodes in interface Graph

See Also:

Graph.visitNodes(GraphVisitor)

visitEdges

public void visitEdges(GraphVisitor visitor)

Description copied from interface: Graph

Applies the visitor pattern to the edges of the graph.

Specified by:

visitEdges in interface Graph

See Also:

Graph.visitEdges(GraphVisitor)

getNodesOfDegree

public List<Node> getNodesOfDegree(int n)

Description copied from interface: Graph

Returns all the nodes in the graph of a specified degree. The degree of a node is the number of edges that are adjacent to the node.

Specified by:

getNodesOfDegree in interface Graph

Parameters:

n - The desired degree of nodes to be returned.

Returns:

A collection of nodes of degree n.

See Also:

Graph.getNodesOfDegree(int), Node.getDegree()

getVisitedNodes

public List<Node> getVisitedNodes(boolean visited)

Description copied from interface: Graph

Returns all the nodes in the graph that have been marked as visited or non-visited.

Specified by:

getVisitedNodes in interface Graph

Parameters:

visited - True if node is visited, false if node is unvisited.

Returns:

List of nodes marked as visited / non-visited.

See Also:

Graph.getVisitedNodes(boolean)

getVisitedEdges

public List<Edge> getVisitedEdges(boolean visited)

Description copied from interface: Graph

Returns all the edges in the graph that have been marked as visited or non-visited.

Specified by:

getVisitedEdges in interface Graph

Parameters:

visited - True if edge is visited, false if edge is unvisited.

Returns:

List of edges marked as visited / non-visited.

See Also:

Graph.getVisitedEdges(boolean)

initNodes

public void initNodes()

Initializes the nodes in the graph by setting all visited flags to false and all visited counts to zero.

See Also:

BasicGraphable.isVisited(), BasicGraphable.getCount()

initEdges

public void initEdges()

Initializes the edges in the graph by setting all visited flags to false and all visited counts to zero.

See Also:

BasicGraphable.isVisited(), BasicGraphable.getCount()

toString

public String toString()

Returns the string representation of the graph which is just the string representation of the edge and node collections.

Overrides:

toString in class Object

Returns:

String represtentaton of graph.