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This geoLatte-geom library offers a geometry model that conforms to the OGC Simple Features for SQL specification.

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/*
 * This file is part of the GeoLatte project.
 *
 *     GeoLatte 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 3 of the License, or
 *     (at your option) any later version.
 *
 *     GeoLatte 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 GeoLatte.  If not, see .
 *
 * Copyright (C) 2010 - 2011 and Ownership of code is shared by:
 * Qmino bvba - Romeinsestraat 18 - 3001 Heverlee  (http://www.qmino.com)
 * Geovise bvba - Generaal Eisenhowerlei 9 - 2140 Antwerpen (http://www.geovise.com)
 */

package org.geolatte.geom;

import java.util.Iterator;

/**
 * Turns a PointSequence into an Iterable over the
 * LineSegments defined by each consecutive pair of Points in the PointSequence.
 *
 * @author Karel Maesen, Geovise BVBA
 *         creation-date: 4/25/11
 */
public class LineSegments implements Iterable> {

    private final PositionSequence
 positions;

    public LineSegments(PositionSequence
 positionSequence) {
        this.positions = positionSequence;
    }

    @Override
    public Iterator> iterator() {

        return new Iterator>() {

            final Iterator
 iterator;
            P startPoint;

            {
                iterator = positions.iterator();
                if (iterator.hasNext()) {
                    startPoint = iterator.next();
                }
            }

            @Override
            public boolean hasNext() {
                return this.iterator.hasNext();
            }

            @Override
            public LineSegment
 next() {
                P endPoint = iterator.next();
                LineSegment
 ls = new LineSegment(startPoint, endPoint);
                startPoint = endPoint;
                return ls;
            }

            @Override
            public void remove() {
                throw new UnsupportedOperationException();
            }
        };
    }

}