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package com.avaje.ebeaninternal.server.query;

import com.avaje.ebean.Version;

import java.sql.Timestamp;
import java.util.Comparator;

/**
 * Compare Version beans in descending order with nulls last.
 */
class OrderVersionDesc implements Comparator> {

  static final OrderVersionDesc INSTANCE = new OrderVersionDesc();

  @Override
  public int compare(Version o1, Version o2) {

    Timestamp v1 = o1.getStart();
    if (v1 == null) {
      return 1;
    }
    Timestamp v2 = o2.getStart();
    if (v2 == null) {
      return -1;
    }
    return v1.compareTo(v2) * -1;
  }

}