com.vividsolutions.jts.noding.SegmentStringUtil Maven / Gradle / Ivy
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/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.noding;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.MultiLineString;
import com.vividsolutions.jts.geom.util.LinearComponentExtracter;
/**
* Utility methods for processing {@link SegmentString}s.
*
* @author Martin Davis
*
*/
public class SegmentStringUtil
{
/**
* Extracts all linear components from a given {@link Geometry}
* to {@link SegmentString}s.
* The SegmentString data item is set to be the source Geometry.
*
* @param geom the geometry to extract from
* @return a List of SegmentStrings
*/
public static List extractSegmentStrings(Geometry geom)
{
return extractNodedSegmentStrings(geom);
}
/**
* Extracts all linear components from a given {@link Geometry}
* to {@link SegmentString}s.
* The SegmentString data item is set to be the source Geometry.
*
* @param geom the geometry to extract from
* @return a List of SegmentStrings
*/
public static List extractNodedSegmentStrings(Geometry geom)
{
List segStr = new ArrayList();
List lines = LinearComponentExtracter.getLines(geom);
for (Iterator i = lines.iterator(); i.hasNext(); ) {
LineString line = (LineString) i.next();
Coordinate[] pts = line.getCoordinates();
segStr.add(new NodedSegmentString(pts, geom));
}
return segStr;
}
/**
* Converts a collection of {@link SegmentString}s into a {@link Geometry}.
* The geometry will be either a {@link LineString} or a {@link MultiLineString} (possibly empty).
*
* @param segStrings a collection of SegmentStrings
* @return a LineString or MultiLineString
*/
public static Geometry toGeometry(Collection segStrings, GeometryFactory geomFact)
{
LineString[] lines = new LineString[segStrings.size()];
int index = 0;
for (Iterator i = segStrings.iterator(); i.hasNext(); ) {
SegmentString ss = (SegmentString) i.next();
LineString line = geomFact.createLineString(ss.getCoordinates());
lines[index++] = line;
}
if (lines.length == 1) return lines[0];
return geomFact.createMultiLineString(lines);
}
public static String toString(List segStrings)
{
StringBuffer buf = new StringBuffer();
for (Iterator i = segStrings.iterator(); i.hasNext(); ) {
SegmentString segStr = (SegmentString) i.next();
buf.append(segStr.toString());
buf.append("\n");
}
return buf.toString();
}
}