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Statistical sampling library for use in virtdata libraries, based on apache commons math 4

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/*
 * Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
package org.antlr.v4.runtime.misc;

/**
 * This default implementation of {@link EqualityComparator} uses object equality
 * for comparisons by calling {@link Object#hashCode} and {@link Object#equals}.
 *
 * @author Sam Harwell
 */
public final class ObjectEqualityComparator extends AbstractEqualityComparator {
	public static final ObjectEqualityComparator INSTANCE = new ObjectEqualityComparator();

	/**
	 * {@inheritDoc}
	 *
	 * 

This implementation returns * {@code obj.}{@link Object#hashCode hashCode()}.

*/ @Override public int hashCode(Object obj) { if (obj == null) { return 0; } return obj.hashCode(); } /** * {@inheritDoc} * *

This implementation relies on object equality. If both objects are * {@code null}, this method returns {@code true}. Otherwise if only * {@code a} is {@code null}, this method returns {@code false}. Otherwise, * this method returns the result of * {@code a.}{@link Object#equals equals}{@code (b)}.

*/ @Override public boolean equals(Object a, Object b) { if (a == null) { return b == null; } return a.equals(b); } }