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

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/*
 * Copyright 2014 Hannes Janetzek
 * Copyright 2017-2018 devemux86
 *
 * 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.OverzoomTileDataSource;
import org.oscim.tiling.source.UrlTileDataSource;
import org.oscim.tiling.source.UrlTileSource;

import java.util.Map;

public abstract class GeojsonTileSource extends UrlTileSource {

    protected GeojsonTileSource(Builder builder) {
        super(builder);
    }

    protected GeojsonTileSource(String urlString, String tilePath) {
        super(urlString, tilePath);
    }

    protected GeojsonTileSource(String urlString, String tilePath, int zoomMin, int zoomMax) {
        super(urlString, tilePath, zoomMin, zoomMax);
    }

    @Override
    public ITileDataSource getDataSource() {
        return new OverzoomTileDataSource(new UrlTileDataSource(this, new TileDecoder(this), getHttpEngine()), mOverZoom);
    }

    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) {
    }
}