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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) 2004-2008, 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
 *    Lesser General Public License for more details.
 */
package org.geotools.geometry.jts;

import java.awt.geom.AffineTransform;
import java.awt.geom.PathIterator;
import org.locationtech.jts.geom.CoordinateSequence;
import org.locationtech.jts.geom.LineString;

/**
 * A path iterator for the LiteShape class, specialized to iterate over LineString object.
 *
 * @author Andrea Aime
 * @author simone giannecchini
 * @version $Id$
 */
public final class LineIterator2 implements PathIterator {

    private double[] allCoords;

    /** Transform applied on the coordinates during iteration */
    private AffineTransform at;

    /** Current line coordinate */
    private int currentCoord = 0;

    private int actualCoords; // numb coordinates

    /** True when the iteration is terminated */
    private boolean done = false;

    public LineIterator2() {}

    /** @see java.awt.geom.PathIterator#currentSegment(float[]) */
    public int currentSegment(float[] coords) {
        if (currentCoord == 0) {
            coords[0] = (float) allCoords[0];
            coords[1] = (float) allCoords[1];
            if (at != null) at.transform(coords, 0, coords, 0, 1);
            return SEG_MOVETO;
        } else {
            coords[0] = (float) allCoords[currentCoord * 2];
            coords[1] = (float) allCoords[currentCoord * 2 + 1];
            if (at != null) at.transform(coords, 0, coords, 0, 1);
            return SEG_LINETO;
        }
    }

    /** */
    public void init(LineString ls, AffineTransform at) {

        if ((at == null) || (at.isIdentity())) {
            this.at = null;
        } else {
            this.at = at;
        }

        CoordinateSequence coordinates = ls.getCoordinateSequence();
        if (coordinates instanceof LiteCoordinateSequence) {
            // array already there for us
            allCoords = ((LiteCoordinateSequence) coordinates).getXYArray();
            actualCoords = coordinates.size();
        } else {
            // build the array
            actualCoords = coordinates.size();
            allCoords = new double[actualCoords * 2];
            for (int t = 0; t < actualCoords; t++) {
                allCoords[t * 2] = coordinates.getOrdinate(t, 0);
                allCoords[t * 2 + 1] = coordinates.getOrdinate(t, 1);
            }
        }

        done = false;
        currentCoord = 0;
    }

    /**
     * Returns the winding rule for determining the interior of the path.
     *
     * @return the winding rule.
     * @see #WIND_EVEN_ODD
     * @see #WIND_NON_ZERO
     */
    public int getWindingRule() {
        return WIND_NON_ZERO;
    }

    /**
     * Tests if the iteration is complete.
     *
     * @return true if all the segments have been read; false otherwise.
     */
    public boolean isDone() {
        return done;
    }

    /**
     * Moves the iterator to the next segment of the path forwards along the primary direction of
     * traversal as long as there are more points in that direction.
     */
    public void next() {
        if (currentCoord == (actualCoords - 1)) {
            done = true;
        } else {
            currentCoord++;
        }
    }

    /** @see java.awt.geom.PathIterator#currentSegment(double[]) */
    public int currentSegment(double[] coords) {
        float[] fco = new float[6];
        int result = currentSegment(fco);
        coords[0] = fco[0];
        coords[1] = fco[1];
        coords[2] = fco[2];
        coords[3] = fco[3];
        return result;
    }
}