001/*
002 * Copyright (C) 2014 konik.io
003 *
004 * This file is part of Konik library.
005 *
006 * Konik library is free software: you can redistribute it and/or modify
007 * it under the terms of the GNU Affero General Public License as published by
008 * the Free Software Foundation, either version 3 of the License, or
009 * (at your option) any later version.
010 *
011 * Konik library is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014 * GNU Affero General Public License for more details.
015 *
016 * You should have received a copy of the GNU Affero General Public License
017 * along with Konik library.  If not, see <http://www.gnu.org/licenses/>.
018 */
019package io.konik.util;
020
021/**
022 * 
023 * The Strings helper class. We can avoid importing Guava or Apache commons for now.
024 */
025public class Strings {
026
027   private Strings() {
028   }
029
030   /**
031    * Null to empty.
032    *
033    * @param string the string
034    * @return the string
035    */
036   public static String nullToEmpty(String string) {
037      return (string == null) ? "" : string;
038   }
039
040   /**
041    * Empty to null.
042    *
043    * @param string the string
044    * @return the string
045    */
046   public static String emptyToNull(String string) {
047      return isNullOrEmpty(string) ? null : string;
048   }
049
050   /**
051    * Checks if is null or empty.
052    *
053    * @param string the string
054    * @return true, if is null or empty
055    */
056   public static boolean isNullOrEmpty(String string) {
057      return string == null || string.isEmpty();
058   }
059
060   /**
061    * Checks if is not null or empty.
062    *
063    * @param string the string
064    * @return true, if is not null or empty
065    */
066   public static boolean isNotEmpty(String string) {
067      return !isNullOrEmpty(string);
068   }
069}