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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.

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/*
	* Copyright (C) 2003-2021 Paolo Boldi and Sebastiano Vigna
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	*     http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
package it.unimi.dsi.fastutil.shorts;
import java.util.Comparator;
/** A class providing static methods and objects that do useful things with comparators.
	*/
public final class ShortComparators {
	private ShortComparators() {}
	/** A type-specific comparator mimicking the natural order. */
	protected static class NaturalImplicitComparator implements ShortComparator , java.io.Serializable {
	 private static final long serialVersionUID = 1L;
	 @Override
	 public final int compare(final short a, final short b) {
	  return ( Short.compare((a),(b)) );
	 }
	 @Override
	 public ShortComparator reversed() { return OPPOSITE_COMPARATOR; }
	 private Object readResolve() { return NATURAL_COMPARATOR; }
	};

	public static final ShortComparator NATURAL_COMPARATOR = new NaturalImplicitComparator();
	/** A type-specific comparator mimicking the opposite of the natural order. */
	protected static class OppositeImplicitComparator implements ShortComparator , java.io.Serializable {
	 private static final long serialVersionUID = 1L;
	 @Override
	 public final int compare(final short a, final short b) {
	  return - ( Short.compare((a),(b)) );
	 }
	 @Override
	 public ShortComparator reversed() { return NATURAL_COMPARATOR; }
	 private Object readResolve() { return OPPOSITE_COMPARATOR; }
	};

	public static final ShortComparator OPPOSITE_COMPARATOR = new OppositeImplicitComparator();
	protected static class OppositeComparator implements ShortComparator , java.io.Serializable {
	 private static final long serialVersionUID = 1L;
	 final ShortComparator comparator;
	 protected OppositeComparator(final ShortComparator c) { comparator = c; }
	 @Override
	 public final int compare(final short a, final short b) { return comparator.compare(b, a); }
	 @Override
	 public final ShortComparator reversed() { return comparator; }
	};
	/** Returns a comparator representing the opposite order of the given comparator.
	 *
	 * @param c a comparator.
	 * @return a comparator representing the opposite order of {@code c}.
	 */
	public static ShortComparator oppositeComparator(final ShortComparator c) {
	 if (c instanceof OppositeComparator) return ((OppositeComparator )c).comparator;
	 return new OppositeComparator (c);
	}
	/** Returns a type-specific comparator that is equivalent to the given comparator.
	 *
	 * @param c a comparator, or {@code null}.
	 * @return a type-specific comparator representing the order of {@code c}.
	 */
	public static ShortComparator asShortComparator(final Comparator c) {
	 if (c == null || c instanceof ShortComparator) return (ShortComparator) c;
	 return new ShortComparator() {
	   @Override
	   public int compare(short x, short y) { return c.compare(Short.valueOf(x), Short.valueOf(y)); }
	   @SuppressWarnings("deprecation")
	   @Override
	   public int compare(Short x, Short y) { return c.compare(x, y); }
	  };
	}
}