001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.io;
003
004import static org.openstreetmap.josm.tools.I18n.tr;
005
006import java.io.File;
007import java.io.IOException;
008import java.io.Writer;
009import java.nio.charset.StandardCharsets;
010import java.nio.file.Files;
011
012import org.openstreetmap.josm.actions.ExtensionFileFilter;
013import org.openstreetmap.josm.gui.layer.Layer;
014import org.openstreetmap.josm.gui.layer.OsmDataLayer;
015
016/**
017 * Exporter to write map data to a GeoJSON file.
018 * @since 4886
019 */
020public class GeoJSONExporter extends FileExporter {
021
022    /** File extension filter for .geojson files */
023    public static final ExtensionFileFilter FILE_FILTER = new ExtensionFileFilter(
024            "geojson,json", "geojson", tr("GeoJSON Files") + " (*.geojson *.json)");
025
026    /**
027     * Constructs a new {@code GeoJSONExporter} with WGS84 projection.
028     */
029    public GeoJSONExporter() {
030        super(FILE_FILTER);
031    }
032
033    @Override
034    public void exportData(File file, Layer layer) throws IOException {
035        if (layer instanceof OsmDataLayer) {
036            try (Writer out = Files.newBufferedWriter(file.toPath(), StandardCharsets.UTF_8)) {
037                out.write(new GeoJSONWriter((OsmDataLayer) layer).write());
038            }
039        } else {
040            throw new IllegalArgumentException(tr("Layer ''{0}'' not supported", layer.getClass().toString()));
041        }
042    }
043}