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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.operation.linemerge;

import com.vividsolutions.jts.geom.*;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.CoordinateList;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * A sequence of {@link LineMergeDirectedEdge}s forming one of the lines that will
 * be output by the line-merging process.
 *
 * @version 1.7
 */
public class EdgeString {
  private GeometryFactory factory;
  private List directedEdges = new ArrayList();
  private Coordinate[] coordinates = null;
  /**
   * Constructs an EdgeString with the given factory used to convert this EdgeString
   * to a LineString
   */
  public EdgeString(GeometryFactory factory) {
    this.factory = factory;
  }

  /**
   * Adds a directed edge which is known to form part of this line.
   */
  public void add(LineMergeDirectedEdge directedEdge) {
    directedEdges.add(directedEdge);
  }

  private Coordinate[] getCoordinates() {
    if (coordinates == null) {
      int forwardDirectedEdges = 0;
      int reverseDirectedEdges = 0;
      CoordinateList coordinateList = new CoordinateList();
      for (Iterator i = directedEdges.iterator(); i.hasNext();) {
        LineMergeDirectedEdge directedEdge = (LineMergeDirectedEdge) i.next();
        if (directedEdge.getEdgeDirection()) {
          forwardDirectedEdges++;
        }
        else {
          reverseDirectedEdges++;
        }
        coordinateList.add(((LineMergeEdge) directedEdge.getEdge()).getLine()
                            .getCoordinates(), false,
          directedEdge.getEdgeDirection());
      }
      coordinates = coordinateList.toCoordinateArray();
      if (reverseDirectedEdges > forwardDirectedEdges) {
        CoordinateArrays.reverse(coordinates);
      }
    }

    return coordinates;
  }

  /**
   * Converts this EdgeString into a LineString.
   */
  public LineString toLineString() {
    return factory.createLineString(getCoordinates());
  }
}