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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  }