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    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  }