/*
 * 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.bin;

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

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

import crosby.binary.file.BlockInputStream;

/**
 * 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 OsmBinMapDataSource extends OsmMapDataSource {

	public boolean isFileSupported(String name) {
		// The extension for the protobuf format is now fixed at .pbf
		// Previously we temporarily used the .bin extension to
		// indicate Scott's format. The .bin extension remains here for the
		// time being, but may be removed.  Please use .pbf.
		return name.endsWith(".pbf") || name.endsWith(".bin");
	}

	@Override
	public void load(InputStream is) throws FormatException {

		OsmBinHandler handler = new OsmBinHandler(getConfig());

		setupHandler(handler);

		try {
			BinParser reader = handler.new BinParser();
			handler = null;
			BlockInputStream stream = new BlockInputStream(is, reader);
			stream.process();
		} catch (NoClassDefFoundError e) {
			throw new FormatException("Failed to read binary file, probably missing protobuf.jar");
		} catch (IOException e) {
			throw new FormatException("Failed to read binary file");
		}
		elementSaver.finishLoading();

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

		addBackground();
	}
}