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The ANTLR 4 Runtime (Optimized)

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/*
 [The "BSD license"]
  Copyright (c) 2012 Terence Parr
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
  3. The name of the author may not be used to endorse or promote products
     derived from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.antlr.v4.runtime.misc;

/**
 *
 * @author Sam Harwell
 */
public class Tuple2 {

	private final T1 item1;
	private final T2 item2;

	public Tuple2(T1 item1, T2 item2) {
		this.item1 = item1;
		this.item2 = item2;
	}

	public final T1 getItem1() {
		return item1;
	}

	public final T2 getItem2() {
		return item2;
	}

	@Override
	public boolean equals(Object obj) {
		if (obj == this) {
			return true;
		}
		else if (!(obj instanceof Tuple2)) {
			return false;
		}

		Tuple2 other = (Tuple2)obj;
		return Tuple.equals(this.item1, other.item1)
			&& Tuple.equals(this.item2, other.item2);
	}

	@Override
	public int hashCode() {
		int hash = 5;
		hash = 79 * hash + (this.item1 != null ? this.item1.hashCode() : 0);
		hash = 79 * hash + (this.item2 != null ? this.item2.hashCode() : 0);
		return hash;
	}

	@Override
	public String toString() {
		return String.format("(%s, %s)", item1, item2);
	}

}