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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) 2017, 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.renderer.crs;

import java.util.ArrayList;
import java.util.List;
import org.locationtech.jts.geom.*;

/** Collects component of a given geometry that have the desired dimension */
public class GeometryDimensionCollector implements GeometryComponentFilter {

    int targetDimension;
    List geometries = new ArrayList<>();

    public GeometryDimensionCollector(int targetDimension) {
        this.targetDimension = targetDimension;
    }

    @Override
    public void filter(Geometry geom) {
        if (!(geom instanceof GeometryCollection)
                && geom.getDimension() == targetDimension
                && !geom.isEmpty()) {
            geometries.add(geom);
        }
    }

    /**
     * Returns the collected elements as either:
     *
     * 
     *   null: in case the colletion is empty
     *   
single geometry: in case there is a single item
     *   
multi-geometry: in all other cases
     * 
     */
    public Geometry collect() {
        if (geometries.isEmpty()) {
            return null;
        } else if (geometries.size() == 1) {
            return geometries.get(0);
        } else {
            GeometryFactory factory = geometries.get(0).getFactory();
            if (targetDimension == 0) {
                return factory.createMultiPoint(geometries.toArray(new Point[geometries.size()]));
            } else if (targetDimension == 1) {
                return factory.createMultiLineString(
                        geometries.toArray(new LineString[geometries.size()]));
            } else if (targetDimension == 2) {
                return factory.createMultiPolygon(
                        geometries.toArray(new Polygon[geometries.size()]));
            }
        }

        return null;
    }
}