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    
018    package org.apache.logging.log4j.jul;
019    
020    import 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     */
029    public 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    }