import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener; //导入依赖的package包/类
public OsmTileLoader(TileLoaderListener listener, Map<String, String> headers) {
    this.headers.put("Accept", "text/html, image/png, image/jpeg, image/gif, */*");
    if (headers != null) {
        this.headers.putAll(headers);
    }
    this.listener = listener;
}
 

import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener; //导入依赖的package包/类
/**
 * Create a OSMFileCacheTileLoader with given cache directory.
 * If cacheDir is not set or invalid, IOException will be thrown.
 * @param map the listener checking for tile load events (usually the map for display)
 * @param cacheDir directory to store cached tiles
 */
public OsmFileCacheTileLoader(TileLoaderListener map, File cacheDir) throws IOException  {
    super(map);
    if (cacheDir == null || (!cacheDir.exists() && !cacheDir.mkdirs()))
        throw new IOException("Cannot access cache directory");

    log.finest("Tile cache directory: " + cacheDir);
    cacheDirBase = cacheDir.getAbsolutePath();
    sourceCacheDirMap = new HashMap<>();
}
 

import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener; //导入依赖的package包/类
public TileController(TileSource source, TileCache tileCache, TileLoaderListener listener) {
    this.tileSource = source;
    this.tileLoader = new OsmTileLoader(listener);
    this.tileCache = tileCache;
}
 

import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener; //导入依赖的package包/类
public TileController(TileSource source, TileCache tileCache, TileLoaderListener listener) {
    tileSource = new OsmTileSource.Mapnik();
    tileLoader = new OsmTileLoader(listener);
    this.tileCache = tileCache;
    jobDispatcher = JobDispatcher.getInstance();
}
 

import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener; //导入依赖的package包/类
public OsmTileLoader(TileLoaderListener listener) {
    headers.put("Accept", "text/html, image/png, image/jpeg, image/gif, */*");
    this.listener = listener;
}
 

import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener; //导入依赖的package包/类
@Override
public TileLoader makeTileLoader(TileLoaderListener listener, Map<String, String> headers) {
    return new MbtilesTileLoader(listener, this.connection);
}
 

import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener; //导入依赖的package包/类
public MbtilesTileLoader(TileLoaderListener listener, Connection conn) {
    super(listener);
    this.connection = conn;
}
 

import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener; //导入依赖的package包/类
/**
 * Constructor
 *
 * @param tileStore
 *             Tile store reader
 * @param listener
 *             Callback mechanism to report tile loader status
 * @throws TileStoreException
 *             Thrown when there's an error in the underlying tile store implementation
 */
public TileStoreLoader(final TileStoreReader tileStore, final TileLoaderListener listener) throws TileStoreException
{
    this.tileStore  = tileStore;
    this.crsProfile = CrsProfileFactory.create(tileStore.getCoordinateReferenceSystem());
    this.listener   = listener;

    this.minimumZoomLevel = tileStore.getZoomLevels().stream().min(Integer::compare).orElse(-1);
    this.maximumZoomLevel = tileStore.getZoomLevels().stream().max(Integer::compare).orElse(-1);
}