1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache license, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the license for the specific language governing permissions and
15 * limitations under the license.
16 */
17 package org.apache.logging.log4j.core.helpers;
18
19 public class Strings {
20
21 /**
22 * <p>Checks if a CharSequence is empty ("") or null.</p>
23 *
24 * <pre>
25 * Strings.isEmpty(null) = true
26 * Strings.isEmpty("") = true
27 * Strings.isEmpty(" ") = false
28 * Strings.isEmpty("bob") = false
29 * Strings.isEmpty(" bob ") = false
30 * </pre>
31 *
32 * <p>NOTE: This method changed in Lang version 2.0.
33 * It no longer trims the CharSequence.
34 * That functionality is available in isBlank().</p>
35 *
36 * <p>Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isEmpty(CharSequence)</p>
37 *
38 * @param cs the CharSequence to check, may be null
39 * @return {@code true} if the CharSequence is empty or null
40 */
41 public static boolean isEmpty(final CharSequence cs) {
42 return cs == null || cs.length() == 0;
43 }
44
45 /**
46 * <p>Checks if a CharSequence is not empty ("") and not null.</p>
47 *
48 * <pre>
49 * StringUtils.isNotEmpty(null) = false
50 * StringUtils.isNotEmpty("") = false
51 * StringUtils.isNotEmpty(" ") = true
52 * StringUtils.isNotEmpty("bob") = true
53 * StringUtils.isNotEmpty(" bob ") = true
54 * </pre>
55 *
56 * <p>Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isNotEmpty(CharSequence)</p>
57 *
58 * @param cs the CharSequence to check, may be null
59 * @return {@code true} if the CharSequence is not empty and not null
60 * @since 3.0 Changed signature from isNotEmpty(String) to isNotEmpty(CharSequence)
61 */
62 public static boolean isNotEmpty(final CharSequence cs) {
63 return !isEmpty(cs);
64 }
65
66 }