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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 second 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 - 2012 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;

/**
 * A {@link  PositionSequenceEquality} implementation that considers two PositionSequences
 * equal if and only if both contain the same positions in the same order. Whether two Positionss
 * are the same is determined by the {@link PositionEquality} instance which is passed in the constructor. In case of the
 * no-argument default constructor, the {@link ExactPositionEquality} is used.
 * 
 * @author Karel Maesen, Geovise BVBA
 *         creation-date: 4/13/12
 */
public class PositionSequencePositionEquality implements PositionSequenceEquality {

    private final PositionEquality positionEquality;

    public PositionSequencePositionEquality(PositionEquality positionEquality) {
        this.positionEquality = positionEquality;
    }

    public PositionSequencePositionEquality() {
        this.positionEquality = new ExactPositionEquality();
    }

    @Override
    public  boolean equals(PositionSequence
 first, PositionSequence
 second) {

        if (first == second) return true;
        if (first == null || second == null) return false;
        if (first.isEmpty() && second.isEmpty()) return true;
        if (first.size() != second.size()) return false;
        return testPointSequenceEquality(first, second);

    }

    private 
 boolean testPointSequenceEquality(PositionSequence
 first, PositionSequence second) {
        if (!first.getPositionClass().equals(second.getPositionClass())) return false;
        double[] c1 = new double[first.getCoordinateDimension()];
        double[] c2 = new double[second.getCoordinateDimension()];
        for (int idx = 0; idx < first.size(); idx++) {
            first.getCoordinates(idx, c1);
            second.getCoordinates(idx, c2);
            if(!this.positionEquality.equals(c1, c2)) return false;
        }
        return true;
    }

}