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.log4j; 19 import org.apache.log4j.helpers.PatternParser; 20 21 /** 22 23 Example showing how to extend EnhancedPatternLayout to recognize additional 24 conversion characters. 25 26 <p>In this case MyPatternLayout recognizes %# conversion pattern. It 27 outputs the value of an internal counter which is also incremented 28 at each call. 29 30 <p>See <a href=doc-files/MyPatternLayout.java><b>source</b></a> code 31 for more details. 32 33 @see MyPatternParser 34 @see org.apache.log4j.EnhancedPatternLayout 35 @author Anders Kristensen 36 */ 37 public class EnhancedMyPatternLayout extends EnhancedPatternLayout { 38 public 39 EnhancedMyPatternLayout() { 40 this(DEFAULT_CONVERSION_PATTERN); 41 } 42 43 public 44 EnhancedMyPatternLayout(String pattern) { 45 super(pattern); 46 } 47 48 public 49 PatternParser createPatternParser(String pattern) { 50 return new MyPatternParser( 51 pattern == null ? DEFAULT_CONVERSION_PATTERN : pattern); 52 } 53 }