package jalview.io.gff;

import jalview.bin.Cache;
import jalview.ext.so.SequenceOntology;

/**
 * A factory class that returns a model of the Sequence Ontology. If the user's
 * Jalview properties file has the line <br>
 * USE_SO_LITE = true <br>
 * then a hard-coded subset will be used, otherwise the full ontology (as
 * downloaded at a point in time).
 * 
 * @author gmcarstairs
 *
 */
public class SequenceOntologyFactory
{
  private static SequenceOntologyI instance;

  public static synchronized SequenceOntologyI getInstance()
  {
    if (instance == null)
    {
      if (Cache.getDefault("USE_SO_LITE", false))
      {
        instance = new SequenceOntologyLite();
      }
      else
      {
        instance = new SequenceOntology();
      }
    }
    return instance;
  }

  public static void setInstance(SequenceOntologyI so)
  {
    instance = so;
  }
}