code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC 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.openqa.selenium.logging;
  
  import java.util.Set;
  import java.util.TreeSet;
  
  /**
   * LocalLogs implementation that holds two other local logs. NOTE: The two local logs are not equal.
   * The first LocalLogs instance is assumed to pre-define which log types it supports, so addEntry
   * will not be called on the first instance unless it pre-declares what it supports. If the first
   * LocalLogs instance does not support this log type, addEntry will be called on the second
   * LocalLogs instance.
   */
  class CompositeLocalLogs extends LocalLogs {
    private LocalLogs predefinedTypeLogger;
    private LocalLogs allTypesLogger;
  
    protected CompositeLocalLogs(LocalLogs predefinedTypeLogger, LocalLogs allTypesLogger) {
      super();
      this.predefinedTypeLogger = predefinedTypeLogger;
      this.allTypesLogger = allTypesLogger;
    }
  
    @Override
    public LogEntries get(String logType) {
      if (predefinedTypeLogger.getAvailableLogTypes().contains(logType)) {
        return predefinedTypeLogger.get(logType);
      }
  
      return allTypesLogger.get(logType);
    }
  
    @Override
    public Set<String> getAvailableLogTypes() {
      TreeSet<String> toReturn = new TreeSet<>();
      toReturn.addAll(predefinedTypeLogger.getAvailableLogTypes());
      toReturn.addAll(allTypesLogger.getAvailableLogTypes());
      return toReturn;
    }
  
    @Override
    public void addEntry(String logType, LogEntry entry) {
      if (predefinedTypeLogger.getAvailableLogTypes().contains(logType)) {
        predefinedTypeLogger.addEntry(logType, entry);
      } else {
        allTypesLogger.addEntry(logType, entry);
      }
    }
  }
  