package jalview.ws;

import jalview.ws.seqfetcher.ASequenceFetcher;

public class SequenceFetcherFactory
{

  private static SequenceFetcher instance;

  /**
   * Returns a new SequenceFetcher object, or a mock object if one has been set
   * 
   * @return
   */
  public static ASequenceFetcher getSequenceFetcher()
  {
    return instance == null ? new SequenceFetcher() : instance;
  }

  /**
   * Set the instance object to use (intended for unit testing with mock
   * objects).
   * 
   * Be sure to reset to null in the tearDown method of any tests!
   * 
   * @param sf
   */
  public static void setSequenceFetcher(SequenceFetcher sf)
  {
    instance = sf;
  }
}