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package org.opentripplanner.graph_builder.services.ned;

import java.io.File;
import java.util.List;
import org.opentripplanner.routing.graph.Graph;

/**
 * A source of NED tiles for NEDGridCoverageFactoryImpl -- maybe the USGS streaming server, maybe
 * one-degree tiles, maybe something else.
 *
 * @author novalis
 */
public interface NEDTileSource {
  /**
   * Fetches all of the required data and stores it in the specified cache directory. It is crucial
   * that this be somewhere permanent with plenty of disk space.  Don't use /tmp -- the downloading
   * process takes a long time and you don't want to repeat it if at all possible.
   */
  void fetchData(Graph graph, File cacheDirectory);

  /**
   * Download all the NED tiles into the cache.
   */
  List getNEDTiles();
}