text: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  #
  # Copyright (c) 2020 Huawei Device Co., Ltd.
  # 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.
  #
  
  from .hdf_add_handler import HdfAddHandler
  from .hdf_delete_handler import HdfDeleteHandler
  from .hdf_get_handler import HdfGetHandler
  from .hdf_set_handler import HdfSetHandler
  from .hdf_ping_handler import HdfPingHandler
  from .hdf_command_error_code import CommandErrorCode
  from hdf_tool_exception import HdfToolException
  
  
  class HdfToolCommands(object):
      def __init__(self):
          self.commands = {
              'add': HdfAddHandler,
              'delete': HdfDeleteHandler,
              'get': HdfGetHandler,
              'set': HdfSetHandler,
              'ping': HdfPingHandler
          }
  
      def run(self, cmd, args):
          if cmd in self.commands:
              return self.commands[cmd](args).run()
          else:
              raise HdfToolException('unknown cmd: "%s"' % cmd,
                                     CommandErrorCode.INTERFACE_ERROR)
  
      def help(self):
          helps = ['command list:']
          for cmd in self.commands.keys():
              helps.append(cmd)
          return ' '.join(helps)
  