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.logging.log4j.core.lookup; 19 20 import org.apache.logging.log4j.Marker; 21 import org.apache.logging.log4j.MarkerManager; 22 import org.apache.logging.log4j.core.LogEvent; 23 import org.apache.logging.log4j.core.config.plugins.Plugin; 24 25 /** 26 * Looks-up markers. 27 * 28 * @since 2.4 29 */ 30 @Plugin(name = "marker", category = StrLookup.CATEGORY) 31 public class MarkerLookup extends AbstractLookup { 32 33 static final String MARKER = "marker"; 34 35 @Override 36 public String lookup(final LogEvent event, final String key) { 37 final Marker marker = event == null ? null : event.getMarker(); 38 return marker == null ? null : marker.getName(); 39 } 40 41 @Override 42 public String lookup(final String key) { 43 return MarkerManager.exists(key) ? key : null; 44 } 45 46 }