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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2015, Open Source Geospatial Foundation (OSGeo)
 *
 *    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;
 *    version 2.1 of the License.
 *
 *    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
 */
package org.geotools.geometry.jts;

import java.util.List;
import org.locationtech.jts.geom.CoordinateSequence;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.LineString;
import org.locationtech.jts.geom.LinearRing;
import org.locationtech.jts.geom.Polygon;

/**
 * A subclass of polygon that can host also curves and will linearize if needed
 *
 * @author Andrea Aime - GeoSolutions
 */
public class CurvePolygon extends Polygon implements CurvedGeometry {

    private static final long serialVersionUID = -6961191502473439328L;
    private double tolerance;

    public CurvePolygon(
            LinearRing shell, List holes, GeometryFactory factory, double tolerance) {
        super(shell, holes.toArray(new LinearRing[holes.size()]), factory);
        this.tolerance = tolerance;
    }

    public CurvePolygon(
            LinearRing shell, LinearRing[] holes, GeometryFactory factory, double tolerance) {
        super(shell, holes, factory);
        this.tolerance = tolerance;
    }

    public Polygon linearize() {
        return linearize(tolerance);
    }

    public Polygon linearize(double tolerance) {

        int numHoles = getNumInteriorRing();
        LinearRing shell = linearize(tolerance, (LinearRing) getExteriorRing());
        LinearRing[] holes = new LinearRing[numHoles];
        for (int k = 0; k < numHoles; k++) {
            LinearRing hole = (LinearRing) getInteriorRingN(k);
            hole = linearize(tolerance, hole);
            holes[k] = hole;
        }

        return getFactory().createPolygon(shell, holes);
    }

    private LinearRing linearize(double tolerance, LinearRing hole) {
        if (hole instanceof CurvedGeometry) {
            CurvedGeometry curved = (CurvedGeometry) hole;
            hole = (LinearRing) curved.linearize(tolerance);
        }
        return hole;
    }

    public String toCurvedText() {
        StringBuilder sb = new StringBuilder("CURVEPOLYGON ");
        if (isEmpty()) {
            sb.append(" EMTPY");
        } else {
            sb.append("(");
            writeRing(sb, getExteriorRing());
            int holeNum = getNumInteriorRing();
            for (int k = 0; k < holeNum; k++) {
                sb.append(", ");
                LineString component = getInteriorRingN(k);
                writeRing(sb, component);
            }
            sb.append(")");
        }
        return sb.toString();
    }

    private void writeRing(StringBuilder sb, LineString component) {
        if (component instanceof SingleCurvedGeometry) {
            SingleCurvedGeometry curved = (SingleCurvedGeometry) component;
            sb.append(curved.toCurvedText());
        } else {
            sb.append("(");
            CoordinateSequence cs = component.getCoordinateSequence();
            for (int i = 0; i < cs.size(); i++) {
                sb.append(cs.getX(i) + " " + cs.getY(i));
                if (i < cs.size() - 1) {
                    sb.append(", ");
                }
            }
            sb.append(")");
        }
    }

    @Override
    public double getTolerance() {
        return tolerance;
    }

    @Override
    public int getCoordinatesDimension() {
        return 2;
    }

    @Override
    public CurvePolygon copyInternal() {
        return new CurvePolygon(shell, holes, factory, tolerance);
    }

    public String toString() {
        return toCurvedText();
    }
}