Subversion Repositories mkgmap

/*
 * Copyright (C) 2010 - 2012.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 or
 * 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.
 */

package uk.me.parabola.mkgmap.reader.osm.xml;

import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import uk.me.parabola.imgfmt.FormatException;
import uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource;

import org.xml.sax.SAXException;


/**
 * Read an OpenStreetMap data file in .osm version 0.5 format.  It is converted
 * into a generic format that the map is built from.
 * <p>The intermediate format is important as several passes are required to
 * produce the map at different zoom levels. At lower resolutions, some roads
 * will have fewer points or won't be shown at all.
 *
 * @author Steve Ratcliffe
 */
public class Osm5MapDataSource extends OsmMapDataSource {

        @Override
        public boolean isFileSupported(String name) {
                // This is the default format so say supported if we get this far,
                // this one must always be last for this reason.
                return true;
        }

        @Override
        public void load(InputStream is) throws FormatException {
                try {
                        SAXParserFactory parserFactory = SAXParserFactory.newInstance();
                        parserFactory.setXIncludeAware(true);
                        parserFactory.setNamespaceAware(true);
                        SAXParser parser = parserFactory.newSAXParser();

                        try {
                                Osm5XmlHandler handler = new Osm5XmlHandler(getConfig());
                                Osm5XmlHandler.SaxHandler saxHandler = handler.new SaxHandler();

                                setupHandler(handler);
                                handler = null;
                               
                                // parse the xml file
                                parser.parse(is, saxHandler);

                                elementSaver.finishLoading();

                                osmReadingHooks.end();
                                osmReadingHooks = null;
                               
                                // now convert the saved elements
                                elementSaver.convert(getConverter());

                                addBackground();

                        } catch (IOException e) {
                                throw new FormatException("Error reading file", e);
                        }
                } catch (SAXException e) {
                        throw new FormatException("Error parsing file", e);
                } catch (ParserConfigurationException e) {
                        throw new FormatException("Internal error configuring xml parser", e);
                }
        }
}