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.remote;
  
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.ImmutableSet;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import org.openqa.selenium.Beta;
  import org.openqa.selenium.UnsupportedCommandException;
  import org.openqa.selenium.WebDriverException;
  import org.openqa.selenium.logging.LocalLogs;
  import org.openqa.selenium.logging.LogCombiner;
  import org.openqa.selenium.logging.LogEntries;
  import org.openqa.selenium.logging.LogEntry;
  import org.openqa.selenium.logging.LogLevelMapping;
  import org.openqa.selenium.logging.LogType;
  import org.openqa.selenium.logging.Logs;
  
  @Beta
  public class RemoteLogs implements Logs {
    private static final String LEVEL = "level";
    private static final String TIMESTAMP = "timestamp";
    private static final String MESSAGE = "message";
  
    private static final Logger LOG = Logger.getLogger(RemoteLogs.class.getName());
  
    protected ExecuteMethod executeMethod;
  
    public static final String TYPE_KEY = "type";
    private final LocalLogs localLogs;
  
    public RemoteLogs(ExecuteMethod executeMethod, LocalLogs localLogs) {
      this.executeMethod = executeMethod;
      this.localLogs = localLogs;
    }
  
    @Override
    public LogEntries get(String logType) {
      if (LogType.PROFILER.equals(logType)) {
        LogEntries remoteEntries = new LogEntries(new ArrayList<>());
        try {
          remoteEntries = getRemoteEntries(logType);
        } catch (WebDriverException e) {
          // An exception may be thrown if the WebDriver server does not recognize profiler logs.
          // In this case, the user should be able to see the local profiler logs.
          LOG.log(Level.WARNING, "Remote profiler logs are not available and have been omitted.", e);
        }
  
        return LogCombiner.combine(remoteEntries, getLocalEntries(logType));
      }
      if (LogType.CLIENT.equals(logType)) {
        return getLocalEntries(logType);
      }
      return getRemoteEntries(logType);
    }
  
    private LogEntries getRemoteEntries(String logType) {
      Object raw = executeMethod.execute(DriverCommand.GET_LOG, ImmutableMap.of(TYPE_KEY, logType));
      if (!(raw instanceof List)) {
        throw new UnsupportedCommandException("malformed response to remote logs command");
      }
      @SuppressWarnings("unchecked")
      List<Map<String, Object>> rawList = (List<Map<String, Object>>) raw;
      List<LogEntry> remoteEntries = new ArrayList<>(rawList.size());
  
      for (Map<String, Object> obj : rawList) {
        remoteEntries.add(
            new LogEntry(
                LogLevelMapping.toLevel((String) obj.get(LEVEL)),
                (Long) obj.get(TIMESTAMP),
                (String) obj.get(MESSAGE)));
      }
      return new LogEntries(remoteEntries);
    }
  
    private LogEntries getLocalEntries(String logType) {
      return localLogs.get(logType);
    }
  
    private Set<String> getAvailableLocalLogs() {
      return localLogs.getAvailableLogTypes();
    }
  
    @Override
    public Set<String> getAvailableLogTypes() {
      Object raw = executeMethod.execute(DriverCommand.GET_AVAILABLE_LOG_TYPES, null);
      @SuppressWarnings("unchecked")
      List<String> rawList = (List<String>) raw;
      ImmutableSet.Builder<String> builder = new ImmutableSet.Builder<>();
      for (String logType : rawList) {
        builder.add(logType);
      }
      builder.addAll(getAvailableLocalLogs());
      return builder.build();
    }
  }
  