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JTS Topology Suite 1.14 with additional functions for GeoSpark
There is a newer version: 0.1.4
/*
* 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();
  }
}