/**
* Default constructor.
*
* @param projection projection for the layer.
* @param minZoom minimum zoom supported by the layer.
* @param maxZoom maximum zoom supported by the layer.
* @param id unique layer id. Id for the layer must be depend ONLY on the layer source, otherwise
* tile caching will not work properly.
* @param path path to the local Sqlite database file. SQLiteException will be thrown if the
* database does not exist or can not be opened in read-only mode.
* @param ctx Android application context.
* @throws IOException exception if file not exists
*/
public MBTilesMapLayer(
Projection projection, int minZoom, int maxZoom, int id, String path, Context ctx)
throws IOException {
super(projection, minZoom, maxZoom, id, path); // TODO: use constructor without path
if (!(new File(path)).exists()) {
throw new IOException("not existing file: " + path);
}
db = new MBTilesDbHelper(ctx, path);
db.open();
hasUtfGrid = db.getMetadata().containsKey("template");
}
@Override
public void run() {
super.run();
Log.debug("DbMapLayer task: Start loading " + " zoom=" + z + " x=" + x + " y=" + y);
// y is flipped (origin=sw in mbtiles)
finished(db.getTileImg(z, x, (1 << (z)) - 1 - y));
cleanUp();
}
@Override
public Map<String, String> getUtfGridTooltips(
MapTile clickedTile, MutableMapPos tilePos, String template) {
// template will be loaded in database request, ignored here
return db.getUtfGridTooltips(clickedTile, tilePos);
}
/** Close database file. After calling this, new tiles will not be read from the database. */
public void close() {
db.close();
db = null;
}