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, may be null per the JUL specification.
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 }