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.util; 018 019/** 020 * Pattern strings used throughout Log4j. 021 * 022 * @see java.util.regex.Pattern 023 */ 024public final class Patterns { 025 026 /** 027 * A pattern string for comma separated lists with optional whitespace. 028 */ 029 public static final String COMMA_SEPARATOR = toWhitespaceSeparator(","); 030 031 /** 032 * The whitespace pattern string. 033 */ 034 public static final String WHITESPACE = "\\s*"; 035 036 private Patterns() { 037 } 038 039 /** 040 * Creates a pattern string for {@code separator} surrounded by whitespace. 041 * 042 * @param separator The separator. 043 * @return a pattern for {@code separator} surrounded by whitespace. 044 */ 045 public static String toWhitespaceSeparator(final String separator) { 046 return WHITESPACE + separator + WHITESPACE; 047 } 048}