/*
    * 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.apache.log4j.helpers;
  
  import org.apache.log4j.Appender;
  import org.apache.log4j.spi.AppenderAttachable;
  import org.apache.log4j.spi.LoggingEvent;
  
  import java.util.Collections;
  import java.util.Enumeration;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  /**
   * Allows Classes to attach Appenders.
   */
  public class AppenderAttachableImpl implements AppenderAttachable {
  
      private final ConcurrentMap<String, Appender> appenders = new ConcurrentHashMap<>();
  
      @Override
      public void addAppender(Appender newAppender) {
          if (newAppender != null) {
              appenders.put(newAppender.getName(), newAppender);
          }
      }
  
      @Override
      public Enumeration getAllAppenders() {
          return Collections.enumeration(appenders.values());
      }
  
      @Override
      public Appender getAppender(String name) {
          return appenders.get(name);
      }
  
      @Override
      public boolean isAttached(Appender appender) {
          return appenders.containsValue(appender);
      }
  
      @Override
      public void removeAllAppenders() {
          appenders.clear();
      }
  
      @Override
      public void removeAppender(Appender appender) {
          appenders.remove(appender.getName(), appender);
      }
  
      @Override
      public void removeAppender(String name) {
          appenders.remove(name);
      }
  
      /**
       * Call the <code>doAppend</code> method on all attached appenders.
       * @param event The event to log.
       * @return The number of appenders.
       */
      public int appendLoopOnAppenders(LoggingEvent event) {
          for (Appender appender : appenders.values()) {
              appender.doAppend(event);
          }
          return appenders.size();
      }
  
      public void close() {
          for (Appender appender : appenders.values()) {
              appender.close();
          }
      }
  }