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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 java.io.File;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import org.geotools.util.Converter;
import org.geotools.util.ConverterFactory;
import org.geotools.util.factory.Hints;

/**
 * Converter factory which can convert between URL,URI, and String.
 *
 * Handles the following conversions:
 *
 * 

 *   String -> URL
 *   
String -> URI
 *   
URL -> URI
 *   
URI -> URL
 * 
 *
 * @author Justin Deoliveira, OpenGEO
 * @since 2.5
 */
public class URConverterFactory implements ConverterFactory {

    public static final Converter StringToURL =
            new Converter() {
                public  T convert(Object source, Class target) throws Exception {
                    String s = (String) source;
                    try {
                        return (T) new URL(s);
                    } catch (MalformedURLException e1) {
                        File f = new File(s);
                        try {
                            return (T) f.toURI().toURL();
                        } catch (MalformedURLException e2) {
                        }
                    }

                    return null;
                }
            };

    public static final Converter StringToURI =
            new Converter() {

                public  T convert(Object source, Class target) throws Exception {
                    String s = (String) source;
                    try {
                        return (T) new URI(s);
                    } catch (URISyntaxException e1) {
                        File f = new File(s);
                        try {
                            return (T) f.toURI();
                        } catch (Exception e2) {
                        }
                    }

                    return null;
                }
            };

    public static final Converter URLToURI =
            new Converter() {

                public  T convert(Object source, Class target) throws Exception {
                    URL url = (URL) source;
                    return (T) url.toURI();
                }
            };

    public static final Converter URIToURL =
            new Converter() {

                public  T convert(Object source, Class target) throws Exception {
                    URI uri = (URI) source;
                    return (T) uri.toURL();
                }
            };

    public Converter createConverter(Class source, Class target, Hints hints) {
        if (String.class.equals(source)) {
            if (URL.class.equals(target)) {
                return StringToURL;
            }
            if (URI.class.equals(target)) {
                return StringToURI;
            }
        }

        if (URL.class.equals(source) && URI.class.equals(target)) {
            return URLToURI;
        }
        if (URI.class.equals(source) && URL.class.equals(target)) {
            return URIToURL;
        }

        return null;
    }
}