001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017 018package org.apache.logging.log4j.core.lookup; 019 020import org.apache.logging.log4j.Marker; 021import org.apache.logging.log4j.MarkerManager; 022import org.apache.logging.log4j.core.LogEvent; 023import org.apache.logging.log4j.core.config.plugins.Plugin; 024 025/** 026 * Looks-up markers. 027 * 028 * @since 2.4 029 */ 030@Plugin(name = "marker", category = StrLookup.CATEGORY) 031public class MarkerLookup extends AbstractLookup { 032 033 static final String MARKER = "marker"; 034 035 @Override 036 public String lookup(final LogEvent event, final String key) { 037 final Marker marker = event == null ? null : event.getMarker(); 038 return marker == null ? null : marker.getName(); 039 } 040 041 @Override 042 public String lookup(final String key) { 043 return MarkerManager.exists(key) ? key : null; 044 } 045 046}