package org.checkerframework.framework.util.defaults;

import java.util.TreeSet;
import org.plumelib.util.StringsPlume;

/**
 * An ordered set of Defaults (see {@link org.checkerframework.framework.util.defaults.Default}).
 * This class provides a little syntactic sugar and a better toString over TreeSet.
 */
@SuppressWarnings("serial")
class DefaultSet extends TreeSet<Default> {

  /** Creates a DefaultSet. */
  public DefaultSet() {
    super(Default::compareTo);
  }

  @Override
  public String toString() {
    return "DefaultSet( " + StringsPlume.join(", ", this) + " )";
  }

  public static final DefaultSet EMPTY = new DefaultSet();
}