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}