source: josm/trunk/src/org/openstreetmap/josm/data/validation/tests/WronglyOrderedWays.java@ 6240

// License: GPL. See LICENSE file for details.
package org.openstreetmap.josm.data.validation.tests;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.util.Collections;

import org.openstreetmap.josm.data.osm.Way;
import org.openstreetmap.josm.data.validation.Severity;
import org.openstreetmap.josm.data.validation.Test;
import org.openstreetmap.josm.data.validation.TestError;
import org.openstreetmap.josm.tools.Geometry;

/**
 * Check cyclic ways for errors
 *
 * @author jrreid
 */
public class WronglyOrderedWays extends Test {

    protected static final int WRONGLY_ORDERED_COAST = 1001;
    protected static final int WRONGLY_ORDERED_LAND  = 1003;

    /**
     * Constructor
     */
    public WronglyOrderedWays() {
        super(tr("Wrongly Ordered Ways"),
                tr("This test checks the direction of water, land and coastline ways."));
    }

    @Override
    public void visit(Way w) {

        if (!w.isUsable() || !w.isClosed())
            return;

        String natural = w.get("natural");
        if (natural == null)
            return;
        else if ("coastline".equals(natural) && Geometry.isClockwise(w)) {
            reportError(w, tr("Reversed coastline: land not on left side"), WRONGLY_ORDERED_COAST);
        } else if ("land".equals(natural) && Geometry.isClockwise(w)) {
            reportError(w, tr("Reversed land: land not on left side"), WRONGLY_ORDERED_LAND);
        } else
            return;

    }

    private void reportError(Way w, String msg, int type) {
        errors.add(new TestError(this, Severity.WARNING, msg, type, Collections.singletonList(w)));
    }
}