org.h2gis.network.graph_creator
Class ST_ShortestPath

java.lang.Object
  org.h2gis.h2spatialapi.AbstractFunction
      org.h2gis.network.graph_creator.GraphFunction
          org.h2gis.network.graph_creator.ST_ShortestPath

All Implemented Interfaces:

Function, ScalarFunction

public class ST_ShortestPath
extends GraphFunction
implements ScalarFunction

Calculates the shortest path(s) between vertices in a JGraphT graph produced from the input_edges table produced by ST_Graph.

Author:

Adam Gouge

Field Summary

static String	NO_GEOM_FIELD_ERROR
static String	REMARKS

Fields inherited from class org.h2gis.network.graph_creator.GraphFunction

ARG_ERROR

Fields inherited from interface org.h2gis.h2spatialapi.ScalarFunction

PROP_DETERMINISTIC, PROP_NOBUFFER

Fields inherited from interface org.h2gis.h2spatialapi.Function

PROP_NAME, PROP_REMARKS

Constructor Summary

ST_ShortestPath()
Constructor

Method Summary

protected static Map<Integer,com.vividsolutions.jts.geom.Geometry>	getEdgeGeometryMap(Connection connection, TableLocation tableName, String firstGeometryField) Return a map of edge ids to edge geometries, or null if the input table contains no geometry fields.
protected static String	getFirstGeometryField(Connection connection, TableLocation tableName) Return the first geometry field of tableName or null if it contains none.
String	getJavaStaticMethod()
static ResultSet	getShortestPath(Connection connection, String inputTable, String orientation, int source, int destination)
static ResultSet	getShortestPath(Connection connection, String inputTable, String orientation, String weight, int source, int destination)

Methods inherited from class org.h2gis.network.graph_creator.GraphFunction

logTime, prepareGraph

Methods inherited from class org.h2gis.h2spatialapi.AbstractFunction

addProperty, getProperty, removeProperty

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.h2gis.h2spatialapi.Function

getProperty

Field Detail

NO_GEOM_FIELD_ERROR

public static final String NO_GEOM_FIELD_ERROR

See Also:

Constant Field Values

REMARKS

public static final String REMARKS

See Also:

Constant Field Values

Constructor Detail

ST_ShortestPath

public ST_ShortestPath()

Constructor

Method Detail

getJavaStaticMethod

public String getJavaStaticMethod()

Specified by:

getJavaStaticMethod in interface ScalarFunction

getShortestPath

public static ResultSet getShortestPath(Connection connection,
                                        String inputTable,
                                        String orientation,
                                        int source,
                                        int destination)
                                 throws SQLException

Parameters:

connection - connection

inputTable - Edges table produced by ST_Graph

orientation - Orientation string

source - Source vertex id

destination - Destination vertex id

Returns:

Shortest path

Throws:

SQLException

getShortestPath

public static ResultSet getShortestPath(Connection connection,
                                        String inputTable,
                                        String orientation,
                                        String weight,
                                        int source,
                                        int destination)
                                 throws SQLException

Parameters:

connection - connection

inputTable - Edges table produced by ST_Graph

orientation - Orientation string

weight - Weight

source - Source vertex id

destination - Destination vertex id

Returns:

Shortest path

Throws:

SQLException

getFirstGeometryField

protected static String getFirstGeometryField(Connection connection,
                                              TableLocation tableName)
                                       throws SQLException

Return the first geometry field of tableName or null if it contains none.

Parameters:

connection - Connection

tableName - TableLocation

Returns:

The first geometry field of tableName or null if it contains none

Throws:

SQLException

getEdgeGeometryMap

protected static Map<Integer,com.vividsolutions.jts.geom.Geometry> getEdgeGeometryMap(Connection connection,
                                                                                      TableLocation tableName,
                                                                                      String firstGeometryField)
                                                                               throws SQLException

Return a map of edge ids to edge geometries, or null if the input table contains no geometry fields.

Parameters:

connection - Connection

tableName - TableLocation

Returns:

A map of edge ids to edge geometries, or null if the input table contains no geometry fields

Throws:

SQLException