    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    }