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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) 2002-2008, 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.data.util;

import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.geometry.jts.WKTReader2;
import org.geotools.util.Converter;
import org.geotools.util.ConverterFactory;
import org.geotools.util.factory.Hints;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.Envelope;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.GeometryFactory;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * Converter factory performing converstions among geometric types.
 *
 * Supported conversions:
 *
 * 

 *   {@link String} to {@link org.locationtech.jts.geom.Geometry}
 *   
{@link org.locationtech.jts.geom.Geometry} to {@link String}
 *   
{@link org.locationtech.jts.geom.Envelope} to {@link org.locationtech.jts.geom.Geometry}
 *   
{@link org.locationtech.jts.geom.Geometry} to {@link org.locationtech.jts.geom.Envelope}
 *   

 * 
 *
 * @author Justin Deoliveira, The Open Planning Project
 * @since 2.4
 */
public class GeometryConverterFactory implements ConverterFactory {

    public Converter createConverter(Class source, Class target, Hints hints) {

        if (Geometry.class.isAssignableFrom(target)) {

            // String to Geometry
            if (String.class.equals(source)) {
                return new Converter() {
                    public Object convert(Object source, Class target) throws Exception {
                        return new WKTReader2().read((String) source);
                    }
                };
            }

            // Envelope to Geometry
            if (Envelope.class.isAssignableFrom(source)) {
                return new Converter() {
                    public Object convert(Object source, Class target) throws Exception {
                        Envelope e = (Envelope) source;
                        GeometryFactory factory = new GeometryFactory();
                        return factory.createPolygon(
                                factory.createLinearRing(
                                        new Coordinate[] {
                                            new Coordinate(e.getMinX(), e.getMinY()),
                                            new Coordinate(e.getMaxX(), e.getMinY()),
                                            new Coordinate(e.getMaxX(), e.getMaxY()),
                                            new Coordinate(e.getMinX(), e.getMaxY()),
                                            new Coordinate(e.getMinX(), e.getMinY())
                                        }),
                                null);
                    }
                };
            }
        }

        if (Geometry.class.isAssignableFrom(source)) {
            // Geometry to envelope
            if (Envelope.class.equals(target)) {
                return new Converter() {
                    public Object convert(Object source, Class target) throws Exception {
                        Geometry geometry = (Geometry) source;
                        Envelope envelope = geometry.getEnvelopeInternal();
                        if (geometry.getUserData() instanceof CoordinateReferenceSystem) {
                            return new ReferencedEnvelope(
                                    envelope, (CoordinateReferenceSystem) geometry.getUserData());
                        }
                        return envelope;
                    }
                };
            }

            // Geometry to String
            if (String.class.equals(target)) {
                return new Converter() {
                    public Object convert(Object source, Class target) throws Exception {
                        Geometry geometry = (Geometry) source;
                        return geometry.toText();
                    }
                };
            }
        }

        return null;
    }
}