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 */
017
018package org.apache.logging.log4j.jul;
019
020import org.apache.logging.log4j.Level;
021
022/**
023 * Strategy interface to convert between custom Log4j {@link Level Levels} and JUL
024 * {@link java.util.logging.Level Levels}.
025 *
026 * @see Constants#LEVEL_CONVERTER_PROPERTY
027 * @since 2.1
028 */
029public interface LevelConverter {
030
031    /**
032     * Converts a JDK logging Level to a Log4j logging Level.
033     *
034     * @param javaLevel JDK Level to convert.
035     * @return converted Level or {@code null} if the given level could not be converted.
036     */
037    Level toLevel(java.util.logging.Level javaLevel);
038
039    /**
040     * Converts a Log4j logging Level to a JDK logging Level.
041     *
042     * @param level Log4j Level to convert.
043     * @return converted Level or {@code null} if the given level could not be converted.
044     */
045    java.util.logging.Level toJavaLevel(Level level);
046}