com.spatial4j.core.io.jts

Class JtsWKTReader

java.lang.Object

com.spatial4j.core.io.WKTReader

com.spatial4j.core.io.jts.JtsWKTReader

All Implemented Interfaces:

ShapeIO, ShapeReader

Direct Known Subclasses:

JtsWKTReaderShapeParser

public class JtsWKTReader
extends WKTReader

Extends WKTReader adding support for polygons, using JTS.

Nested Class Summary

Nested classes/interfaces inherited from class com.spatial4j.core.io.WKTReader

WKTReader.State

Field Summary

Fields

Modifier and Type	Field and Description
protected JtsSpatialContext	ctx

Fields inherited from interface com.spatial4j.core.io.ShapeIO

GeoJSON, LEGACY, POLY, WKT

Constructor Summary

Constructors

Constructor and Description
JtsWKTReader(JtsSpatialContext ctx, JtsSpatialContextFactory factory)

Method Summary

Methods

Modifier and Type	Method and Description
protected com.vividsolutions.jts.geom.Coordinate	coordinate(WKTReader.State state) Reads a Coordinate from the current position.
protected com.vividsolutions.jts.geom.Coordinate[]	coordinateSequence(WKTReader.State state) Reads a JTS Coordinate sequence from the current position.
protected List<com.vividsolutions.jts.geom.Coordinate[]>	coordinateSequenceList(WKTReader.State state) Reads a list of JTS Coordinate sequences from the current position.
DatelineRule	getDatelineRule()
protected double	normDist(double v) Called to normalize a value that isn't X or Y.
protected Shape	parseLineStringShape(WKTReader.State state) Bypasses JtsSpatialContext.makeLineString(java.util.List) so that we can more efficiently get the LineString without creating a List<Point>.
protected Shape	parseMulitPolygonShape(WKTReader.State state) Parses a MULTIPOLYGON shape from the raw string.
protected Shape	parsePolygonShape(WKTReader.State state) Parses a POLYGON shape from the raw string.
protected Shape	parseShapeByType(WKTReader.State state, String shapeType) (internal) Parses the remainder of a shape definition following the shape's name given as shapeType already consumed via WKTReader.State.nextWord().
protected com.vividsolutions.jts.geom.Polygon	polygon(WKTReader.State state) Reads a polygon, returning a JTS polygon.

Methods inherited from class com.spatial4j.core.io.WKTReader

getFormatName, newState, parse, parseBufferShape, parseEnvelopeShape, parseGeometryCollectionShape, parseIfSupported, parseMultiLineStringShape, parseMultiPointShape, parsePointShape, point, pointList, read, read, readIfSupported, shape

Methods inherited from class java.lang.Object

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

Field Detail

ctx

protected final JtsSpatialContext ctx

Constructor Detail

JtsWKTReader

public JtsWKTReader(JtsSpatialContext ctx,
            JtsSpatialContextFactory factory)

Method Detail

getDatelineRule

public DatelineRule getDatelineRule()

See Also:

DatelineRule

parseShapeByType

protected Shape parseShapeByType(WKTReader.State state,
                     String shapeType)
                          throws ParseException

Description copied from class: WKTReader

(internal) Parses the remainder of a shape definition following the shape's name given as shapeType already consumed via WKTReader.State.nextWord(). If it's able to parse the shape, WKTReader.State.offset should be advanced beyond it (e.g. to the ',' or ')' or EOF in general). The default implementation checks the name against some predefined names and calls corresponding parse methods to handle the rest. Overriding this method is an excellent extension point for additional shape types. Or, use this class by delegation to this method.

When writing a parse method that reacts to a specific shape type, remember to handle the dimension and EMPTY token via WKTReader.State.nextIfEmptyAndSkipZM().

Overrides:

parseShapeByType in class WKTReader

shapeType - Non-Null string; could have mixed case. The first character is a letter.

Returns:

The shape or null if not supported / unknown.

Throws:

ParseException

parseLineStringShape

protected Shape parseLineStringShape(WKTReader.State state)
                              throws ParseException

Bypasses JtsSpatialContext.makeLineString(java.util.List) so that we can more efficiently get the LineString without creating a List<Point>.

Overrides:

parseLineStringShape in class WKTReader

Throws:

ParseException

See Also:

WKTReader.pointList(WKTReader.State)

parsePolygonShape

protected Shape parsePolygonShape(WKTReader.State state)
                           throws ParseException

Parses a POLYGON shape from the raw string. It might return a Rectangle if the polygon is one.

 coordinateSequenceList
 

Throws:

ParseException

polygon

protected com.vividsolutions.jts.geom.Polygon polygon(WKTReader.State state)
                                               throws ParseException

Reads a polygon, returning a JTS polygon.

Throws:

ParseException

parseMulitPolygonShape

protected Shape parseMulitPolygonShape(WKTReader.State state)
                                throws ParseException

Parses a MULTIPOLYGON shape from the raw string.

   '(' polygon (',' polygon )* ')'
 

Throws:

ParseException

coordinateSequenceList

protected List<com.vividsolutions.jts.geom.Coordinate[]> coordinateSequenceList(WKTReader.State state)
                                                                         throws ParseException

Reads a list of JTS Coordinate sequences from the current position.

   '(' coordinateSequence (',' coordinateSequence )* ')'
 

Throws:

ParseException

coordinateSequence

protected com.vividsolutions.jts.geom.Coordinate[] coordinateSequence(WKTReader.State state)
                                                               throws ParseException

Reads a JTS Coordinate sequence from the current position.

   '(' coordinate (',' coordinate )* ')'
 

Throws:

ParseException

coordinate

protected com.vividsolutions.jts.geom.Coordinate coordinate(WKTReader.State state)
                                                     throws ParseException

Reads a Coordinate from the current position. It's akin to WKTReader.point(com.spatial4j.core.io.WKTReader.State) but for a JTS Coordinate. Only the first 2 numbers are parsed; any remaining are ignored.

Throws:

ParseException

normDist

protected double normDist(double v)

Description copied from class: WKTReader

Called to normalize a value that isn't X or Y. X & Y or normalized via SpatialContext.normX(double) & normY.

Overrides:

normDist in class WKTReader