org.geolatte.geom.codec.db.sqlserver.PolygonSqlServerDecoder Maven / Gradle / Ivy

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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 - 2013 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.codec.db.sqlserver;

import org.geolatte.geom.LinearRing;
import org.geolatte.geom.Polygon;
import org.geolatte.geom.PositionSequence;
import org.geolatte.geom.crs.CoordinateReferenceSystem;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Karel Maesen, Geovise BVBA
 */
class PolygonSqlServerDecoder extends AbstractSqlServerDecoder {

    @Override
    protected OpenGisType getOpenGisType() {
        return OpenGisType.POLYGON;
    }

    protected Polygon createNullGeometry(CoordinateReferenceSystem crs) {
        return new Polygon(crs);
    }

    protected Polygon createGeometry(SqlServerGeometry nativeGeom) {
        return createGeometry(nativeGeom, 0);
    }

    protected Polygon createGeometry(SqlServerGeometry nativeGeom, int shapeIndex) {
        if (nativeGeom.isEmptyShape(shapeIndex)) {
            return createNullGeometry(nativeGeom.getCoordinateReferenceSystem());
        }
        //polygons consist of one exterior ring figure, and several interior ones.
        IndexRange figureRange = nativeGeom.getFiguresForShape(shapeIndex);
        List> rings = new ArrayList>(figureRange.length());
        //the rings should contain all inner rings from index 1 to index length - 1
        // index = 0 should be reserved for the shell.
        for (int figureIdx = figureRange.start, i = 1; figureIdx < figureRange.end; figureIdx++) {
            IndexRange pntIndexRange = nativeGeom.getPointsForFigure(figureIdx);
            if (nativeGeom.isFigureInteriorRing(figureIdx)) {
                rings.add(i++, toLinearRing(nativeGeom, pntIndexRange));
            } else {
                rings.add(0, toLinearRing(nativeGeom, pntIndexRange));
            }
        }
        LinearRing[] ringArr = (LinearRing[]) new LinearRing[rings.size()];
        return new Polygon(rings.toArray(ringArr));
    }

    private LinearRing toLinearRing(SqlServerGeometry nativeGeom, IndexRange range) {
        PositionSequence positionSequence = nativeGeom.coordinateRange(range);
        return new LinearRing(positionSequence, nativeGeom.getCoordinateReferenceSystem());
    }

}