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    package org.slf4j.helpers;
018    
019    import java.util.concurrent.ConcurrentHashMap;
020    import java.util.concurrent.ConcurrentMap;
021    
022    import org.slf4j.IMarkerFactory;
023    import org.slf4j.Marker;
024    
025    /**
026     *
027     */
028    public class Log4jMarkerFactory implements IMarkerFactory {
029    
030        private final ConcurrentMap<String, Marker> markerMap = new ConcurrentHashMap<String, Marker>();
031    
032        @Override
033        public Marker getMarker(final String name) {
034            if (name == null) {
035                throw new IllegalArgumentException("Marker name must not be null");
036            }
037            Marker marker = markerMap.get(name);
038            if (marker != null) {
039                return marker;
040            }
041            marker = new MarkerWrapper(name);
042            Marker existing = markerMap.putIfAbsent(name, marker);
043            return existing == null ? marker : existing;
044        }
045    
046        @Override
047        public boolean exists(final String name) {
048            return markerMap.containsKey(name);
049        }
050    
051        @Override
052        public boolean detachMarker(final String name) {
053            return false;
054        }
055    
056        @Override
057        public Marker getDetachedMarker(final String name) {
058            return new MarkerWrapper(name);
059        }
060    }