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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.awt;

import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.PathIterator;
import java.util.Collection;
import java.util.Iterator;

/**
 * A {@link PathIterator} which provides paths for a collection of {@link Shape}s. 
 * 
 * @author Martin Davis
 */
public class ShapeCollectionPathIterator implements PathIterator {
    private Iterator shapeIterator;
    
    // initialize with a no-op iterator
    private PathIterator currentPathIterator = new PathIterator() {
            public int getWindingRule() {
                throw new UnsupportedOperationException();
            }

            public boolean isDone() {
                return true;
            }

            public void next() {
            }

            public int currentSegment(float[] coords) {
                throw new UnsupportedOperationException();
            }

            public int currentSegment(double[] coords) {
                throw new UnsupportedOperationException();
            }
        };

    private AffineTransform affineTransform;
    private boolean done = false;

    /**
     * Creates a new path iterator for a collection of {@link Shape}s.
     * 
     * @param shapes the Shapes in the collection
     * @param affineTransform a optional transformation to be applied to the coordinates in the path (may be null)
     */
    public ShapeCollectionPathIterator(Collection shapes,
        AffineTransform affineTransform) {
        shapeIterator = shapes.iterator();
        this.affineTransform = affineTransform;
        next();
    }

    public int getWindingRule() {
    	/**
       * WIND_NON_ZERO is more accurate than WIND_EVEN_ODD, and can be comparable
       * in speed. (See http://www.geometryalgorithms.com/Archive/algorithm_0103/algorithm_0103.htm#Winding%20Number)
       * However, WIND_NON_ZERO requires that the
       * shell and holes be oriented in a certain way.
       * So use WIND_EVEN_ODD. 
     	 */
      return PathIterator.WIND_EVEN_ODD;
    }

    public boolean isDone() {
        return done;
    }

    public void next() {
        currentPathIterator.next();

        if (currentPathIterator.isDone() && !shapeIterator.hasNext()) {
            done = true;
            return;
        }
        if (currentPathIterator.isDone()) {
            currentPathIterator = ((Shape) shapeIterator.next()).getPathIterator(affineTransform);
        }
    }

    public int currentSegment(float[] coords) {
        return currentPathIterator.currentSegment(coords);
    }

    public int currentSegment(double[] coords) {
        return currentPathIterator.currentSegment(coords);
    }
}