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.firefox;
  
  import com.google.common.collect.ImmutableMap;
  import java.util.Collections;
  import java.util.Map;
  import java.util.logging.Level;
  
  /**
   * <a href="https://github.com/mozilla/geckodriver#log-object">Log levels</a> defined by GeckoDriver
   */
  public enum FirefoxDriverLogLevel {
    TRACE,
    DEBUG,
    CONFIG,
    INFO,
    WARN,
    ERROR,
    FATAL;
  
    private static final Map<Level, FirefoxDriverLogLevel> logLevelToGeckoLevelMap =
        new ImmutableMap.Builder<Level, FirefoxDriverLogLevel>()
            .put(Level.ALL, TRACE)
            .put(Level.FINEST, TRACE)
            .put(Level.FINER, TRACE)
            .put(Level.FINE, DEBUG)
            .put(Level.CONFIG, CONFIG)
            .put(Level.INFO, INFO)
            .put(Level.WARNING, WARN)
            .put(Level.SEVERE, ERROR)
            .put(Level.OFF, FATAL)
            .build();
  
    @Override
    public String toString() {
      return super.toString().toLowerCase();
    }
  
    public static FirefoxDriverLogLevel fromString(String text) {
      if (text != null) {
        for (FirefoxDriverLogLevel b : FirefoxDriverLogLevel.values()) {
          if (text.equalsIgnoreCase(b.toString())) {
            return b;
          }
        }
      }
      return null;
    }
  
    public static FirefoxDriverLogLevel fromLevel(Level level) {
      return logLevelToGeckoLevelMap.getOrDefault(level, DEBUG);
    }
  
    Map<String, String> toJson() {
      return Collections.singletonMap("level", toString());
    }
  
    static FirefoxDriverLogLevel fromJson(Map<String, String> json) {
      return fromString(json.get("level"));
    }
  }
  