def checkArgs()

in core/src/main/scala/kafka/admin/ConsumerGroupCommand.scala [1091:1154]
56 lines of code
23 McCabe index (conditional complexity)

    def checkArgs(): Unit = {

      CommandLineUtils.checkRequiredArgs(parser, options, bootstrapServerOpt)

      if (options.has(describeOpt)) {
        if (!options.has(groupOpt) && !options.has(allGroupsOpt))
          CommandLineUtils.printUsageAndDie(parser,
            s"Option $describeOpt takes one of these options: ${allGroupSelectionScopeOpts.mkString(", ")}")
        val mutuallyExclusiveOpts: Set[OptionSpec[_]] = Set(membersOpt, offsetsOpt, stateOpt)
        if (mutuallyExclusiveOpts.toList.map(o => if (options.has(o)) 1 else 0).sum > 1) {
          CommandLineUtils.printUsageAndDie(parser,
            s"Option $describeOpt takes at most one of these options: ${mutuallyExclusiveOpts.mkString(", ")}")
        }
        if (options.has(stateOpt) && options.valueOf(stateOpt) != null)
          CommandLineUtils.printUsageAndDie(parser,
            s"Option $describeOpt does not take a value for $stateOpt")
      } else {
        if (options.has(timeoutMsOpt))
          debug(s"Option $timeoutMsOpt is applicable only when $describeOpt is used.")
      }

      if (options.has(deleteOpt)) {
        if (!options.has(groupOpt) && !options.has(allGroupsOpt))
          CommandLineUtils.printUsageAndDie(parser,
            s"Option $deleteOpt takes one of these options: ${allGroupSelectionScopeOpts.mkString(", ")}")
        if (options.has(topicOpt))
          CommandLineUtils.printUsageAndDie(parser, s"The consumer does not support topic-specific offset " +
            "deletion from a consumer group.")
      }

      if (options.has(deleteOffsetsOpt)) {
        if (!options.has(groupOpt) || !options.has(topicOpt))
          CommandLineUtils.printUsageAndDie(parser,
            s"Option $deleteOffsetsOpt takes the following options: ${allDeleteOffsetsOpts.mkString(", ")}")
      }

      if (options.has(resetOffsetsOpt)) {
        if (options.has(dryRunOpt) && options.has(executeOpt))
          CommandLineUtils.printUsageAndDie(parser, s"Option $resetOffsetsOpt only accepts one of $executeOpt and $dryRunOpt")

        if (!options.has(dryRunOpt) && !options.has(executeOpt)) {
          Console.err.println("WARN: No action will be performed as the --execute option is missing." +
            "In a future major release, the default behavior of this command will be to prompt the user before " +
            "executing the reset rather than doing a dry run. You should add the --dry-run option explicitly " +
            "if you are scripting this command and want to keep the current default behavior without prompting.")
        }

        if (!options.has(groupOpt) && !options.has(allGroupsOpt))
          CommandLineUtils.printUsageAndDie(parser,
            s"Option $resetOffsetsOpt takes one of these options: ${allGroupSelectionScopeOpts.mkString(", ")}")
        CommandLineUtils.checkInvalidArgs(parser, options, resetToOffsetOpt,   allResetOffsetScenarioOpts - resetToOffsetOpt)
        CommandLineUtils.checkInvalidArgs(parser, options, resetToDatetimeOpt, allResetOffsetScenarioOpts - resetToDatetimeOpt)
        CommandLineUtils.checkInvalidArgs(parser, options, resetByDurationOpt, allResetOffsetScenarioOpts - resetByDurationOpt)
        CommandLineUtils.checkInvalidArgs(parser, options, resetToEarliestOpt, allResetOffsetScenarioOpts - resetToEarliestOpt)
        CommandLineUtils.checkInvalidArgs(parser, options, resetToLatestOpt,   allResetOffsetScenarioOpts - resetToLatestOpt)
        CommandLineUtils.checkInvalidArgs(parser, options, resetToCurrentOpt,  allResetOffsetScenarioOpts - resetToCurrentOpt)
        CommandLineUtils.checkInvalidArgs(parser, options, resetShiftByOpt,    allResetOffsetScenarioOpts - resetShiftByOpt)
        CommandLineUtils.checkInvalidArgs(parser, options, resetFromFileOpt,   allResetOffsetScenarioOpts - resetFromFileOpt)
      }

      CommandLineUtils.checkInvalidArgs(parser, options, groupOpt, allGroupSelectionScopeOpts - groupOpt)
      CommandLineUtils.checkInvalidArgs(parser, options, groupOpt, allConsumerGroupLevelOpts - describeOpt - deleteOpt - resetOffsetsOpt)
      CommandLineUtils.checkInvalidArgs(parser, options, topicOpt, allConsumerGroupLevelOpts - deleteOpt - resetOffsetsOpt)
    }