de.cismet.watergis.utils

Class GeometryUtils

java.lang.Object

de.cismet.watergis.utils.GeometryUtils

public class GeometryUtils
extends Object

Contains some useful geometry processing operations.

Version:

$Revision$, $Date$

Author:

therter

Constructor Summary

Constructors

Constructor and Description
GeometryUtils()

Method Summary

Modifier and Type	Method and Description
static void	clearDbfFile(String fileName) Removes all content from the given shp or shx file, so that the file contains only the header.
static void	clearShpOrShxFile(String fileName, int shpGeoType) Removes all content from the given shp or shx file, so that the file contains only the header.
static com.vividsolutions.jts.geom.Geometry	createDummyGeometry(String geometryType) Creates a dummy geometry of the given type.
static byte	getShpGeometryType(String geometryType) Determines the shape geometry type.
static boolean	isLineOrPoint(com.vividsolutions.jts.geom.Geometry geom) DOCUMENT ME!
static com.vividsolutions.jts.geom.Geometry	makeValid(com.vividsolutions.jts.geom.Geometry g) Let the db executes a makeValid on the given geometry.
static com.vividsolutions.jts.geom.Geometry	setEndpointOfLine(com.vividsolutions.jts.geom.Geometry line, com.vividsolutions.jts.geom.Coordinate newEndpoint) Set the end point of the given line to the given coordinate.
static com.vividsolutions.jts.geom.Geometry[]	splitGeom(com.vividsolutions.jts.geom.Geometry geom, com.vividsolutions.jts.geom.LineString splitLine) Splits the given geometry at the given line.
static com.vividsolutions.jts.geom.Geometry[]	splitPolygon(com.vividsolutions.jts.geom.Geometry sourceGeom, com.vividsolutions.jts.geom.LineString splitter) The algorithm was taken from http://wiki.postgis.org/support/wiki/index.php?SplitPolygonWithLineString.
static com.vividsolutions.jts.geom.Geometry	unionFeatureEnvelopes(List<de.cismet.cismap.commons.features.FeatureServiceFeature> sourceFeatures) Unions the geometries of the given features.
static com.vividsolutions.jts.geom.Geometry	unionFeatureGeometries(List<de.cismet.cismap.commons.features.FeatureServiceFeature> sourceFeatures) Unions the geometries of the given features.
static com.vividsolutions.jts.geom.Geometry	unionGeometries(List<com.vividsolutions.jts.geom.Geometry> geom, int from, int to) An union method that is faster as the iterativ approach with the union() method.
static com.vividsolutions.jts.geom.Geometry	unionGeometries2(List<com.vividsolutions.jts.geom.Geometry> geomList) DOCUMENT ME!
static com.vividsolutions.jts.geom.Geometry	unionPolygons(List<com.vividsolutions.jts.geom.Geometry> geomList) DOCUMENT ME!

Methods inherited from class java.lang.Object

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

Constructor Detail

GeometryUtils

public GeometryUtils()

Method Detail

makeValid

public static com.vividsolutions.jts.geom.Geometry makeValid(com.vividsolutions.jts.geom.Geometry g)
                                                      throws Exception

Let the db executes a makeValid on the given geometry.

Parameters:

g - the geometry to make valid

Returns:

the (hopefully) valid geometry

Throws:

Exception - DOCUMENT ME!

splitGeom

public static com.vividsolutions.jts.geom.Geometry[] splitGeom(com.vividsolutions.jts.geom.Geometry geom,
                                                               com.vividsolutions.jts.geom.LineString splitLine)

Splits the given geometry at the given line.

Parameters:

geom - the geometry to split

splitLine - the geometry will be splitted at this linestring

Returns:

An array with the two resulted geometries

splitPolygon

public static com.vividsolutions.jts.geom.Geometry[] splitPolygon(com.vividsolutions.jts.geom.Geometry sourceGeom,
                                                                  com.vividsolutions.jts.geom.LineString splitter)

The algorithm was taken from http://wiki.postgis.org/support/wiki/index.php?SplitPolygonWithLineString.

Parameters:

sourceGeom - a polygon

splitter - the linestring to split the polygon

Returns:

An array with the two resulted geometries

unionFeatureEnvelopes

public static com.vividsolutions.jts.geom.Geometry unionFeatureEnvelopes(List<de.cismet.cismap.commons.features.FeatureServiceFeature> sourceFeatures)

Unions the geometries of the given features.

Parameters:

sourceFeatures - the features the union

Returns:

DOCUMENT ME!

unionFeatureGeometries

public static com.vividsolutions.jts.geom.Geometry unionFeatureGeometries(List<de.cismet.cismap.commons.features.FeatureServiceFeature> sourceFeatures)

Unions the geometries of the given features.

Parameters:

sourceFeatures - the features the union

Returns:

DOCUMENT ME!

unionGeometries

public static com.vividsolutions.jts.geom.Geometry unionGeometries(List<com.vividsolutions.jts.geom.Geometry> geom,
                                                                   int from,
                                                                   int to)

An union method that is faster as the iterativ approach with the union() method.

Parameters:

geom - the list with the geometries to union

from - the index of the first element that should be used for the union operation

to - the index of the last element that should be used for the union operation

Returns:

DOCUMENT ME!

unionGeometries2

public static com.vividsolutions.jts.geom.Geometry unionGeometries2(List<com.vividsolutions.jts.geom.Geometry> geomList)

DOCUMENT ME!

Parameters:

geomList - DOCUMENT ME!

Returns:

DOCUMENT ME!

isLineOrPoint

public static boolean isLineOrPoint(com.vividsolutions.jts.geom.Geometry geom)

DOCUMENT ME!

Parameters:

geom - DOCUMENT ME!

Returns:

DOCUMENT ME!

unionPolygons

public static com.vividsolutions.jts.geom.Geometry unionPolygons(List<com.vividsolutions.jts.geom.Geometry> geomList)

DOCUMENT ME!

Parameters:

geomList - DOCUMENT ME!

Returns:

DOCUMENT ME!

setEndpointOfLine

public static com.vividsolutions.jts.geom.Geometry setEndpointOfLine(com.vividsolutions.jts.geom.Geometry line,
                                                                     com.vividsolutions.jts.geom.Coordinate newEndpoint)
                                                              throws IllegalArgumentException

Set the end point of the given line to the given coordinate. The old endpoint will be removed

Parameters:

line - a LineString or MultiLineString

newEndpoint - the new end point

Returns:

a LineString or MultiLineString with the given endpoint.

Throws:

IllegalArgumentException - DOCUMENT ME!

createDummyGeometry

public static com.vividsolutions.jts.geom.Geometry createDummyGeometry(String geometryType)

Creates a dummy geometry of the given type.

Parameters:

geometryType - DOCUMENT ME!

Returns:

a dummy geometry of the given type

getShpGeometryType

public static byte getShpGeometryType(String geometryType)

Determines the shape geometry type. In a shape file, every geometry type is described by one byte.

Parameters:

geometryType - DOCUMENT ME!

Returns:

the shape geometry type.

clearShpOrShxFile

public static void clearShpOrShxFile(String fileName,
                                     int shpGeoType)
                              throws IOException

Removes all content from the given shp or shx file, so that the file contains only the header.

Parameters:

fileName - the file to clear

shpGeoType - DOCUMENT ME!

Throws:

IOException - DOCUMENT ME!

clearDbfFile

public static void clearDbfFile(String fileName)
                         throws IOException

Removes all content from the given shp or shx file, so that the file contains only the header.

Parameters:

fileName - the file to clear

Throws:

IOException - DOCUMENT ME!