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 org.openqa.selenium.UnsupportedCommandException;
  import org.openqa.selenium.remote.http.HttpMethod;
  
  /**
   * Converts {@link Command} objects to and from another representation.
   *
   * @param <T> The type of encoded command.
   */
  public interface CommandCodec<T> {
  
    /**
     * @return Whether this {@link CommandCodec} supports the given command name.
     */
    boolean isSupported(String commandName);
  
    /**
     * Encodes a command.
     *
     * @param command the command to encode.
     * @return the encoded command.
     * @throws UnsupportedCommandException If the command is not supported by this codec.
     */
    T encode(Command command);
  
    /**
     * Decodes a command.
     *
     * @param encodedCommand the command to decode.
     * @return the decoded command.
     * @throws UnsupportedCommandException If the command is not supported by this codec.
     */
    Command decode(T encodedCommand);
  
    /** Enhance this command codec with additional commands. */
    void defineCommand(String name, HttpMethod method, String pathPattern);
  
    /**
     * Allow commands to have aliases.
     *
     * @param commandName The command being added.
     * @param isAnAliasFor The command name that this is an alias for.
     */
    void alias(String commandName, String isAnAliasFor);
  }
  