CswJTSToGML311LinearRingConverter.java

/**
 * Copyright (c) Codice Foundation
 *
 * This 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 any later version.
 *
 * This program 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. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 *
 **/
package org.codice.ddf.spatial.ogc.csw.catalog.source;

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

import org.jvnet.ogc.gml.v_3_1_1.ObjectFactoryInterface;
import org.jvnet.ogc.gml.v_3_1_1.jts.JTSToGML311CoordinateConverter;
import org.jvnet.ogc.gml.v_3_1_1.jts.JTSToGML311LinearRingConverter;
import org.jvnet.ogc.gml.v_3_1_1.jts.JTSToGML311SRSReferenceGroupConverterInterface;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.LinearRing;

import net.opengis.gml.v_3_1_1.DirectPositionListType;
import net.opengis.gml.v_3_1_1.LinearRingType;

/**
 * An implementation of {@link JTSToGML311LinearRingConverter} that provides a 
 * means of customizing the LinearRing GML. By default, the
 * {@code CswJTSToGML311LinearRingConverter} behaves identically to the 
 * {@code JTSToGML311LinearRingConverter}, but the output of the converter can
 * be customized via constructor argument(s).
 */
public class CswJTSToGML311LinearRingConverter extends JTSToGML311LinearRingConverter {
    boolean usePosList = false;

    /**
     * Constructs a LinearRing converter that is functionally identical to the
     * converter constructed by 
     * {@link org.jvnet.ogc.gml.v_3_1_1.jts.JTSToGML311LinearRingConverter#JTSToGML311LinearRingConverter(ObjectFactoryInterface, JTSToGML311SRSReferenceGroupConverterInterface, JTSToGML311CoordinateConverter)}
     */
    public CswJTSToGML311LinearRingConverter(ObjectFactoryInterface objectFactory,
            JTSToGML311SRSReferenceGroupConverterInterface srsReferenceGroupConverter,
            JTSToGML311CoordinateConverter coordinateConverter) {
        this(objectFactory, srsReferenceGroupConverter, coordinateConverter, false);
    }

    /**
     * Constructs a LinearRing converter that is functionally identical to the
     * converter constructed by 
     * {@link org.jvnet.ogc.gml.v_3_1_1.jts.JTSToGML311LinearRingConverter#JTSToGML311LinearRingConverter(ObjectFactoryInterface, JTSToGML311SRSReferenceGroupConverterInterface, JTSToGML311CoordinateConverter)}
     * with the exception that if usePosList is true the returned 
     * {@link LinearRingType} will have its posList member variable populated 
     * and set, rather than its posOrPointPropertyOrPointRep. When converted to
     * a string, this results in the GML containing a single <posList> element,
     * rather than a list of <pos> elements.
     */
    public CswJTSToGML311LinearRingConverter(ObjectFactoryInterface objectFactory,
            JTSToGML311SRSReferenceGroupConverterInterface srsReferenceGroupConverter,
            JTSToGML311CoordinateConverter coordinateConverter, boolean usePosList) {
        super(objectFactory, srsReferenceGroupConverter, coordinateConverter);
        this.usePosList = usePosList;
    }

    /**
     * @see {@code JTSToGML311LinearRingConverter#doCreateGeometryType}
     */
    @Override
    protected LinearRingType doCreateGeometryType(LinearRing linearRing) {
        final LinearRingType resultLinearRing;

        if (usePosList) {
            resultLinearRing = getObjectFactory().createLinearRingType();

            List<Double> posDoubleList = new ArrayList<Double>();
            for (Coordinate coordinate : linearRing.getCoordinates()) {
                posDoubleList.add(coordinate.x);
                posDoubleList.add(coordinate.y);
            }

            DirectPositionListType directPosListType = new DirectPositionListType();
            directPosListType.setValue(posDoubleList);
            resultLinearRing.setPosList(directPosListType);
        } else {
            resultLinearRing = super.doCreateGeometryType(linearRing);
        }

        return resultLinearRing;
    }
}