Subversion Repositories mkgmap

/*
 * Copyright (C) 2007 Steve Ratcliffe
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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 General Public License for more details.
 *
 *
 * Author: Steve Ratcliffe
 * Create date: 02-Sep-2007
 */
package uk.me.parabola.mkgmap.reader;

import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

import uk.me.parabola.mkgmap.general.LoadableMapDataSource;
import uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource;
import uk.me.parabola.mkgmap.reader.polish.PolishMapDataSource;
import uk.me.parabola.mkgmap.reader.test.ElementTestDataSource;

/**
 * Class to find the correct map reader to use, based on the type of the file
 * to be read.
 *
 * Allows new map readers to be registered, the map readers are in charge of
 * recognising file formats that they can deal with.
 *
 * @author Steve Ratcliffe
 */
public class MapReader {
        private static final List<LoadableMapDataSource> loaders;
        static {
                loaders = new ArrayList<>();
                loaders.add(new PolishMapDataSource());
                loaders.add(new ElementTestDataSource());
                loaders.add(new OsmMapDataSource()); // must be last
        }

        /**
         * Return a suitable map reader.  The name of the resource to be read is
         * passed in.  This is usually a file name, but could be something else.
         *
         * @param name The resource name to be read.
         * @return A LoadableMapDataSource that is capable of reading the resource.
         */
        public static LoadableMapDataSource createMapReader(String name) {
                for (LoadableMapDataSource loader : loaders) {
                        if (loader.isFileSupported(name)) {
                                try {
                                        return loader.getClass().getDeclaredConstructor().newInstance();
                                } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
                                                | InvocationTargetException | NoSuchMethodException | SecurityException e) {
                                        // try the next one.
                                }
                        }
                }

                throw new UnsupportedOperationException("Don't know how to read " + name);
        }
}