    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 * http://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019
    020package org.apache.commons.compress.utils;
    021
    022/**
    023 * PRIVATE.
    024 *
    025 * Performs exact math through {@link Math} "exact" APIs.
    026 */
    027public class ExactMath {
    028
    029    /**
    030     * Returns the int result of adding an int and a long, and throws an exception if the result overflows an int.
    031     *
    032     * @param x the first value, an int.
    033     * @param y the second value, a long,
    034     * @return the addition of both values.
    035     * @throws IllegalArgumentException when y or the result overflows an int
    036     */
    037    public static int add(final int x, final long y) {
    038        try {
    039            return Math.addExact(x, Math.toIntExact(y));
    040        } catch (final ArithmeticException exp) {
    041            throw new IllegalArgumentException("Argument too large or result overflows", exp);
    042        }
    043    }
    044
    045    private ExactMath() {
    046        // no instances
    047    }
    048
    049}