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.util;
18
19 import java.util.regex.Pattern;
20
21 /**
22 * Pattern strings used throughout Log4j.
23 *
24 * @see Pattern
25 */
26 public final class Patterns {
27
28 /**
29 * A pattern string for comma separated lists with optional whitespace.
30 */
31 public static final String COMMA_SEPARATOR = toWhitespaceSeparator(",");
32
33 /**
34 * The whitespace pattern string.
35 */
36 public static final String WHITESPACE = "\\s*";
37
38 private Patterns() {
39 }
40
41 /**
42 * Creates a pattern string for {@code separator} surrounded by whitespace.
43 *
44 * @param separator The separator.
45 * @return a pattern for {@code separator} surrounded by whitespace.
46 */
47 public static String toWhitespaceSeparator(final String separator) {
48 return WHITESPACE + separator + WHITESPACE;
49 }
50
51 }