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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  package org.slf4j.helpers;
18  
19  import java.util.concurrent.ConcurrentHashMap;
20  import java.util.concurrent.ConcurrentMap;
21  
22  import org.slf4j.IMarkerFactory;
23  import org.slf4j.Marker;
24  
25  /**
26   *
27   */
28  public class Log4jMarkerFactory implements IMarkerFactory {
29  
30      private final ConcurrentMap<String, Marker> markerMap = new ConcurrentHashMap<String, Marker>();
31  
32      @Override
33      public Marker getMarker(final String name) {
34          if (name == null) {
35              throw new IllegalArgumentException("Marker name must not be null");
36          }
37          Marker marker = markerMap.get(name);
38          if (marker != null) {
39              return marker;
40          }
41          marker = new MarkerWrapper(name);
42          final Marker existing = markerMap.putIfAbsent(name, marker);
43          return existing == null ? marker : existing;
44      }
45  
46      @Override
47      public boolean exists(final String name) {
48          return markerMap.containsKey(name);
49      }
50  
51      @Override
52      public boolean detachMarker(final String name) {
53          return false;
54      }
55  
56      @Override
57      public Marker getDetachedMarker(final String name) {
58          return new MarkerWrapper(name);
59      }
60  }