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package org.datavec.dataframe.util;

import it.unimi.dsi.fastutil.ints.IntComparator;
import it.unimi.dsi.fastutil.longs.LongComparator;

import javax.annotation.concurrent.Immutable;

/**
 * A Comparator for int primitives for sorting in reverse order, using the given comparator
 */
@Immutable
public final class ReverseIntComparator {

  static final IntComparator reverseIntComparator = new IntComparator() {

    @Override
    public int compare(int o2, int o1) {
      return (o1 < o2 ? -1 : (o1 == o2) ? 0 : 1);
    }

    @Override
    public int compare(Integer o2, Integer o1) {
      return (o1 < o2 ? -1 : (o1.equals(o2) ? 0 : 1));
    }
  };

  public static IntComparator instance() {
    return reverseIntComparator;
  }

}