001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.helpers;
018
019/**
020 * Helps deal with integers.
021 */
022public class Integers {
023
024    /**
025     * Parses the string argument as a signed decimal integer.
026     *
027     * @param s
028     *            a {@code String} containing the {@code int} representation to parse, may be {@code null} or {@code ""}
029     * @param defaultValue
030     *            the return value, use {@code defaultValue} if {@code s} is {@code null} or {@code ""}
031     * @return the integer value represented by the argument in decimal.
032     * @throws NumberFormatException
033     *             if the string does not contain a parsable integer.
034     */
035    public static int parseInt(String s, int defaultValue) {
036        return Strings.isEmpty(s) ? defaultValue : Integer.parseInt(s);
037    }
038
039    /**
040     * Parses the string argument as a signed decimal integer.
041     *
042     * @param s
043     *            a {@code String} containing the {@code int} representation to parse, may be {@code null} or {@code ""}
044     * @return the integer value represented by the argument in decimal.
045     * @throws NumberFormatException
046     *             if the string does not contain a parsable integer.
047     */
048    public static int parseInt(String s) {
049        return parseInt(s, 0);
050    }
051}