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