/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache license, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License. You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the license for the specific language governing permissions and
   * limitations under the license.
   */
  package org.slf4j.helpers;
  
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  import org.slf4j.IMarkerFactory;
  import org.slf4j.Marker;
  
  /**
   *
   */
  public class Log4jMarkerFactory implements IMarkerFactory {
  
      private final ConcurrentMap<String, Marker> markerMap = new ConcurrentHashMap<String, Marker>();
  
      @Override
      public Marker getMarker(final String name) {
          if (name == null) {
              throw new IllegalArgumentException("Marker name must not be null");
          }
          Marker marker = markerMap.get(name);
          if (marker != null) {
              return marker;
          }
          marker = new MarkerWrapper(name);
          Marker existing = markerMap.putIfAbsent(name, marker);
          return existing == null ? marker : existing;
      }
  
      @Override
      public boolean exists(final String name) {
          return markerMap.containsKey(name);
      }
  
      @Override
      public boolean detachMarker(final String name) {
          return false;
      }
  
      @Override
      public Marker getDetachedMarker(final String name) {
          return new MarkerWrapper(name);
      }
  }