| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package examples; |
| |
| import org.apache.log4j.*; |
| import org.apache.log4j.helpers.PatternParser; |
| |
| /** |
| |
| Example showing how to extend PatternLayout to recognize additional |
| conversion characters. |
| |
| <p>In this case MyPatternLayout recognizes %# conversion pattern. It |
| outputs the value of an internal counter which is also incremented |
| at each call. |
| |
| <p>See <a href=doc-files/MyPatternLayout.java><b>source</b></a> code |
| for more details. |
| |
| @see MyPatternParser |
| @see org.apache.log4j.PatternLayout |
| @author Anders Kristensen |
| */ |
| public class MyPatternLayout extends PatternLayout { |
| public |
| MyPatternLayout() { |
| this(DEFAULT_CONVERSION_PATTERN); |
| } |
| |
| public |
| MyPatternLayout(String pattern) { |
| super(pattern); |
| } |
| |
| public |
| PatternParser createPatternParser(String pattern) { |
| return new MyPatternParser( |
| pattern == null ? DEFAULT_CONVERSION_PATTERN : pattern); |
| } |
| |
| public |
| static void main(String[] args) { |
| Layout layout = new MyPatternLayout("[counter=%.10#] - %m%n"); |
| Logger logger = Logger.getLogger("some.cat"); |
| logger.addAppender(new ConsoleAppender(layout, ConsoleAppender.SYSTEM_OUT)); |
| logger.debug("Hello, log"); |
| logger.info("Hello again..."); |
| } |
| } |