org.oscim.tiling.source.geojson.GeoJsonTileSource Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of vtm-extras Show documentation

OpenGL vector map library - running on Android, iOS, Desktop and browser.

There is a newer version: 0.21.0

/*
 * Copyright 2014 Hannes Janetzek
 *
 * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
 *
 * This program 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, either version 3 of the License, or (at your option) any later version.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see .
 */
package org.oscim.tiling.source.geojson;

import org.oscim.core.MapElement;
import org.oscim.core.Tag;
import org.oscim.tiling.ITileDataSource;
import org.oscim.tiling.source.UrlTileDataSource;
import org.oscim.tiling.source.UrlTileSource;

import java.util.HashMap;
import java.util.Map;

public abstract class GeoJsonTileSource extends UrlTileSource {

    public GeoJsonTileSource(String url) {
        super(url, "/{Z}/{X}/{Y}.json");
        Map opt = new HashMap();
        opt.put("Accept-Encoding", "gzip");
        setHttpRequestHeaders(opt);
    }

    public GeoJsonTileSource(String url, int zoomMin, int zoomMax) {
        super(url, "/{Z}/{X}/{Y}.json", zoomMin, zoomMax);
        Map opt = new HashMap();
        opt.put("Accept-Encoding", "gzip");
        setHttpRequestHeaders(opt);
    }

    @Override
    public ITileDataSource getDataSource() {

        return new UrlTileDataSource(this, new GeoJsonTileDecoder(this), getHttpEngine());
    }

    public Tag getFeatureTag() {
        return null;
    }

    /**
     * allow overriding tag handling
     */
    public abstract void decodeTags(MapElement mapElement, Map properties);

    public Tag rewriteTag(String key, Object value) {

        if (value == null)
            return null;

        String val = (value instanceof String) ? (String) value : String.valueOf(value);

        return new Tag(key, val);
    }

    /**
     * modify mapElement before process()
     */
    public void postGeomHook(MapElement mapElement) {

    }
}