001/*
002 * GWTEventService
003 * Copyright (c) 2011 and beyond, strawbill UG (haftungsbeschr?nkt)
004 *
005 * This is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU Lesser General Public License as
007 * published by the Free Software Foundation; either version 3 of
008 * the License, or (at your option) any later version.
009 * Other licensing for GWTEventService may also be possible on request.
010 * Please view the license.txt of the project for more information.
011 *
012 * This software is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this software; if not, write to the Free
019 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021 */
022package de.novanic.eventservice.util;
023
024import java.util.Scanner;
025
026/**
027 * Utility class to provide String and parsing operations.
028 *
029 * @author sstrohschein
030 *         <br>Date: 05.03.2009
031 *         <br>Time: 23:54:01
032 */
033public final class StringUtil
034{
035    private StringUtil() {}
036
037    /**
038     * Returns the integer of the value and throws a {@link de.novanic.eventservice.util.ServiceUtilException} when it isn't numeric (integer).
039     * @param aValue value to parse
040     * @return parsed integer
041     * @throws ServiceUtilException thrown when the value isn't numeric
042     */
043    public static Integer readInteger(String aValue) throws ServiceUtilException {
044        if(aValue != null) {
045            Scanner theScanner = new Scanner(aValue.trim());
046            if(theScanner.hasNextInt()) {
047                return theScanner.nextInt();
048            } else {
049                throw new ServiceUtilException("The value \"" + aValue + "\" couldn't parsed to an integer!");
050            }
051        }
052        return null;
053    }
054}