text: /*
   * Copyright 2017-present Facebook, Inc.
   *
   * Licensed 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.
   */
  #pragma once
  
  #include <string>
  #include <unordered_map>
  
  #include <folly/Optional.h>
  #include <folly/Range.h>
  
  namespace folly {
  
  /**
   * Configuration for a LogHandler
   */
  class LogHandlerConfig {
   public:
    using Options = std::unordered_map<std::string, std::string>;
  
    LogHandlerConfig();
    explicit LogHandlerConfig(StringPiece type);
    explicit LogHandlerConfig(Optional<StringPiece> type);
    LogHandlerConfig(StringPiece type, Options options);
    LogHandlerConfig(Optional<StringPiece> type, Options options);
  
    /**
     * Update this LogHandlerConfig object by merging in settings from another
     * LogConfig.
     *
     * The other LogHandlerConfig must not have a type set.
     */
    void update(const LogHandlerConfig& other);
  
    bool operator==(const LogHandlerConfig& other) const;
    bool operator!=(const LogHandlerConfig& other) const;
  
    /**
     * The handler type name.
     *
     * If this field is unset than this configuration object is intended to be
     * used to update an existing LogHandler object.  This field must always
     * be set in the configuration for all existing LogHandler objects.
     */
    Optional<std::string> type;
  
    Options options;
  };
  
  } // namespace folly
  