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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
    18  package org.apache.logging.log4j.jul;
    19
    20  import org.apache.logging.log4j.Level;
    21
    22  /**
    23   * Strategy interface to convert between custom Log4j {@link Level Levels} and JUL
    24   * {@link java.util.logging.Level Levels}.
    25   *
    26   * @see Constants#LEVEL_CONVERTER_PROPERTY
    27   * @since 2.1
    28   */
    29  public interface LevelConverter {
    30
    31      /**
    32       * Converts a JDK logging Level to a Log4j logging Level.
    33       *
    34       * @param javaLevel JDK Level to convert.
    35       * @return converted Level or {@code null} if the given level could not be converted.
    36       */
    37      Level toLevel(java.util.logging.Level javaLevel);
    38
    39      /**
    40       * Converts a Log4j logging Level to a JDK logging Level.
    41       *
    42       * @param level Log4j Level to convert.
    43       * @return converted Level or {@code null} if the given level could not be converted.
    44       */
    45      java.util.logging.Level toJavaLevel(Level level);
    46  }