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 static org.openqa.selenium.json.Json.MAP_TYPE;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Objects;
  import org.openqa.selenium.json.JsonInput;
  
  public class Command {
  
    private final SessionId sessionId;
    private final CommandPayload payload;
  
    public Command(SessionId sessionId, String name) {
      this(sessionId, name, new HashMap<>());
    }
  
    public Command(SessionId sessionId, String name, Map<String, ?> parameters) {
      this(sessionId, new CommandPayload(name, parameters));
    }
  
    public Command(SessionId sessionId, CommandPayload payload) {
      this.sessionId = sessionId;
      this.payload = payload;
    }
  
    public SessionId getSessionId() {
      return sessionId;
    }
  
    public String getName() {
      return payload.getName();
    }
  
    public Map<String, ?> getParameters() {
      return payload.getParameters();
    }
  
    @Override
    public String toString() {
      return "[" + sessionId + ", " + getName() + " " + getParameters() + "]";
    }
  
    @Override
    public boolean equals(Object o) {
      if (!(o instanceof Command)) {
        return false;
      }
  
      Command that = (Command) o;
      return Objects.equals(this.sessionId, that.sessionId)
          && Objects.equals(this.getName(), that.getName())
          && Objects.equals(this.getParameters(), that.getParameters());
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(sessionId, getName(), getParameters());
    }
  
    private static Command fromJson(JsonInput input) {
      input.beginObject();
  
      SessionId sessionId = null;
      String name = null;
      Map<String, Object> parameters = null;
  
      while (input.hasNext()) {
        switch (input.nextName()) {
          case "name":
            name = input.nextString();
            break;
  
          case "parameters":
            parameters = input.read(MAP_TYPE);
            break;
  
          case "sessionId":
            sessionId = input.read(SessionId.class);
            break;
  
          default:
            input.skipValue();
            break;
        }
      }
  
      input.endObject();
  
      return new Command(sessionId, name, parameters);
    }
  }
  