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 019public class Strings { 020 021 /** 022 * <p>Checks if a CharSequence is empty ("") or null.</p> 023 * 024 * <pre> 025 * Strings.isEmpty(null) = true 026 * Strings.isEmpty("") = true 027 * Strings.isEmpty(" ") = false 028 * Strings.isEmpty("bob") = false 029 * Strings.isEmpty(" bob ") = false 030 * </pre> 031 * 032 * <p>NOTE: This method changed in Lang version 2.0. 033 * It no longer trims the CharSequence. 034 * That functionality is available in isBlank().</p> 035 * 036 * <p>Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isEmpty(CharSequence)</p> 037 * 038 * @param cs the CharSequence to check, may be null 039 * @return {@code true} if the CharSequence is empty or null 040 */ 041 public static boolean isEmpty(final CharSequence cs) { 042 return cs == null || cs.length() == 0; 043 } 044 045 /** 046 * <p>Checks if a CharSequence is not empty ("") and not null.</p> 047 * 048 * <pre> 049 * StringUtils.isNotEmpty(null) = false 050 * StringUtils.isNotEmpty("") = false 051 * StringUtils.isNotEmpty(" ") = true 052 * StringUtils.isNotEmpty("bob") = true 053 * StringUtils.isNotEmpty(" bob ") = true 054 * </pre> 055 * 056 * <p>Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isNotEmpty(CharSequence)</p> 057 * 058 * @param cs the CharSequence to check, may be null 059 * @return {@code true} if the CharSequence is not empty and not null 060 * @since 3.0 Changed signature from isNotEmpty(String) to isNotEmpty(CharSequence) 061 */ 062 public static boolean isNotEmpty(final CharSequence cs) { 063 return !isEmpty(cs); 064 } 065 066}