001/** 002 * Logback: the reliable, generic, fast and flexible logging framework. 003 * Copyright (C) 1999-2021, QOS.ch. All rights reserved. 004 * 005 * This program and the accompanying materials are dual-licensed under 006 * either the terms of the Eclipse Public License v1.0 as published by 007 * the Eclipse Foundation 008 * 009 * or (per the licensee's choosing) 010 * 011 * under the terms of the GNU Lesser General Public License version 2.1 012 * as published by the Free Software Foundation. 013 */ 014package ch.qos.logback.classic.pattern; 015 016import ch.qos.logback.classic.PatternLayout; 017import ch.qos.logback.classic.spi.ILoggingEvent; 018import ch.qos.logback.core.pattern.CompositeConverter; 019import ch.qos.logback.core.pattern.Converter; 020 021public class PrefixCompositeConverter extends CompositeConverter<ILoggingEvent> { 022 023 public String convert(ILoggingEvent event) { 024 StringBuilder buf = new StringBuilder(); 025 Converter<ILoggingEvent> childConverter = this.getChildConverter(); 026 027 for (Converter<ILoggingEvent> c = childConverter; c != null; c = c.getNext()) { 028 if (c instanceof MDCConverter) { 029 MDCConverter mdcConverter = (MDCConverter) c; 030 031 String key = mdcConverter.getKey(); 032 if (key != null) { 033 buf.append(key).append("="); 034 } 035 } else if (c instanceof PropertyConverter) { 036 PropertyConverter pc = (PropertyConverter) c; 037 String key = pc.getKey(); 038 if (key != null) { 039 buf.append(key).append("="); 040 } 041 } else { 042 String classOfConverter = c.getClass().getName(); 043 044 String key = PatternLayout.CONVERTER_CLASS_TO_KEY_MAP.get(classOfConverter); 045 if (key != null) 046 buf.append(key).append("="); 047 } 048 buf.append(c.convert(event)); 049 } 050 return buf.toString(); 051 } 052 053 protected String transform(ILoggingEvent event, String in) { 054 throw new UnsupportedOperationException(); 055 } 056}