001/** 002 * Logback: the reliable, generic, fast and flexible logging framework. 003 * Copyright (C) 1999-2015, 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 java.util.Map; 017 018import ch.qos.logback.classic.spi.ILoggingEvent; 019import ch.qos.logback.classic.spi.LoggerContextVO; 020 021public final class PropertyConverter extends ClassicConverter { 022 023 String key; 024 025 public void start() { 026 String optStr = getFirstOption(); 027 if (optStr != null) { 028 key = optStr; 029 super.start(); 030 } 031 } 032 033 public String getKey() { 034 return key; 035 } 036 037 public String convert(ILoggingEvent event) { 038 if (key == null) { 039 return "Property_HAS_NO_KEY"; 040 } else { 041 LoggerContextVO lcvo = event.getLoggerContextVO(); 042 Map<String, String> map = lcvo.getPropertyMap(); 043 String val = map.get(key); 044 if (val != null) { 045 return val; 046 } else { 047 return System.getProperty(key); 048 } 049 } 050 } 051}