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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) 2014, 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 java.util.logging.Level;
import java.util.logging.Logger;
import org.geotools.referencing.CRS;
import org.geotools.util.Converter;
import org.geotools.util.ConverterFactory;
import org.geotools.util.factory.Hints;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * Convert String to CRS classes.
 *
 * @author Simone Giannecchini, GeoSolutions
 * @since 12.0
 * @version 11.0
 */
public class CRSConverterFactory implements ConverterFactory {

    private static final Logger LOGGER =
            org.geotools.util.logging.Logging.getLogger(CRSConverterFactory.class);

    private static final CRSConverter STRING_TO_CRS = new CRSConverter();

    /**
     * Delegates to {@link ConvertUtils#lookup(java.lang.Class)} to create a converter instance.
     *
     * @see ConverterFactory#createConverter(Class, Class, Hints).
     */
    public Converter createConverter(Class source, Class target, Hints hints) {
        if (source == null || target == null) {
            if (LOGGER.isLoggable(Level.FINE)) {
                LOGGER.fine("CRSConverterFactory can be applied from Strings to CRS only.");
            }
            return null; // only do strings
        }
        if (CoordinateReferenceSystem.class.isAssignableFrom(target)
                && String.class.isAssignableFrom(source)) {
            return STRING_TO_CRS;
        }

        if (CoordinateReferenceSystem.class.isAssignableFrom(source)
                && String.class.isAssignableFrom(target)) {
            return STRING_TO_CRS;
        }

        if (LOGGER.isLoggable(Level.FINE)) {
            LOGGER.fine("CRSConverterFactory can be applied from Strings to CRS  only.");
        }

        return null;
    }

    // some additional converters
    /** converts a string to an {@link CoordinateReferenceSystem} Object. */
    static class CRSConverter implements Converter {
        @SuppressWarnings("unchecked")
        public  T convert(Object source, Class target) throws Exception {
            // checks
            if (source == null || target == null) {
                return null;
            }

            // STRING TO CRS
            if ((source instanceof String)
                    && CoordinateReferenceSystem.class.isAssignableFrom(target)) {
                if (LOGGER.isLoggable(Level.FINE)) {
                    LOGGER.fine(
                            "CRSConverter: Converting object of class "
                                    + source.getClass().getCanonicalName()
                                    + " to "
                                    + target.getCanonicalName());
                }
                // convert
                String input = (String) source;
                input = input.trim();

                // try the decode first for EPSG:XXX
                try {
                    return (T) CRS.decode(input);
                } catch (Exception e) {
                    if (LOGGER.isLoggable(Level.FINE)) {
                        LOGGER.log(Level.FINE, e.getLocalizedMessage(), e);
                    }
                }

                // try the wkt afterwards
                try {
                    return (T) CRS.parseWKT(input);
                } catch (Exception e) {
                    if (LOGGER.isLoggable(Level.FINE)) {
                        LOGGER.log(Level.FINE, e.getLocalizedMessage(), e);
                    }
                }
            }

            // CRS TO STRING
            if ((source instanceof CoordinateReferenceSystem)
                    && String.class.isAssignableFrom(target)) {
                if (LOGGER.isLoggable(Level.FINE)) {
                    LOGGER.fine(
                            "CRSConverter: Converting object of class "
                                    + source.getClass().getCanonicalName()
                                    + " to "
                                    + target.getCanonicalName());
                }
                try {
                    return (T) ((CoordinateReferenceSystem) source).toWKT();
                } catch (Exception e) {
                    if (LOGGER.isLoggable(Level.FINE)) {
                        LOGGER.log(Level.FINE, e.getLocalizedMessage(), e);
                    }
                }
            }

            // failed
            if (LOGGER.isLoggable(Level.FINE)) {
                LOGGER.fine(
                        "CRSConverter: Unable to convert object of class "
                                + source.getClass().getCanonicalName()
                                + " to "
                                + target.getCanonicalName());
            }
            return null;
        }
    }
}