private static void printUsage()

in hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java [2269:2383]
115 lines of code
36 McCabe index (conditional complexity)

  private static void printUsage(String cmd) {
    if ("-report".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-report] [-live] [-dead] [-decommissioning]"
          + " [-enteringmaintenance] [-inmaintenance] [-slownodes]");
    } else if ("-safemode".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-safemode enter | leave | get | wait | forceExit]");
    } else if ("-allowSnapshot".equalsIgnoreCase(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-allowSnapshot <snapshotDir>]");
    } else if ("-disallowSnapshot".equalsIgnoreCase(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-disallowSnapshot <snapshotDir>]");
    } else if ("-provisionSnapshotTrash".equalsIgnoreCase(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-provisionSnapshotTrash <snapshotDir> [-all]]");
    } else if ("-saveNamespace".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-saveNamespace [-beforeShutdown]]");
    } else if ("-rollEdits".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin [-rollEdits]");
    } else if ("-restoreFailedStorage".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-restoreFailedStorage true|false|check ]");
    } else if ("-refreshNodes".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [-refreshNodes]");
    } else if ("-finalizeUpgrade".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [-finalizeUpgrade]");
    } else if (RollingUpgradeCommand.matches(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [" + RollingUpgradeCommand.USAGE+"]");
    } else if ("-upgrade".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-upgrade query | finalize]");
    } else if ("-metasave".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-metasave filename]");
    } else if (SetQuotaCommand.matches(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [" + SetQuotaCommand.USAGE+"]");
    } else if (ClearQuotaCommand.matches(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " ["+ClearQuotaCommand.USAGE+"]");
    } else if (SetSpaceQuotaCommand.matches(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [" + SetSpaceQuotaCommand.USAGE+"]");
    } else if (ClearSpaceQuotaCommand.matches(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " ["+ClearSpaceQuotaCommand.USAGE+"]");
    } else if ("-refreshServiceAcl".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [-refreshServiceAcl]");
    } else if ("-refreshUserToGroupsMappings".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [-refreshUserToGroupsMappings]");
    } else if ("-refreshSuperUserGroupsConfiguration".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [-refreshSuperUserGroupsConfiguration]");
    } else if ("-refreshCallQueue".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [-refreshCallQueue]");
    } else if ("-reconfig".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-reconfig <namenode|datanode> <host:ipc_port|livenodes|decomnodes> "
          + "<start|status|properties>]");
    } else if ("-refresh".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-refresh <hostname:ipc_port> "
          + "<resource_identifier> [arg1..argn]");
    } else if ("-printTopology".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [-printTopology]");
    } else if ("-refreshNamenodes".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                         + " [-refreshNamenodes datanode-host:ipc_port]");
    } else if ("-getVolumeReport".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-getVolumeReport datanode-host:ipc_port]");
    } else if ("-deleteBlockPool".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-deleteBlockPool datanode-host:ipc_port blockpoolId [force]]");
    } else if ("-setBalancerBandwidth".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
                  + " [-setBalancerBandwidth <bandwidth in bytes per second>]");
    } else if ("-getBalancerBandwidth".equalsIgnoreCase(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-getBalancerBandwidth <datanode_host:ipc_port>]");
    } else if ("-fetchImage".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-fetchImage <local directory>]");
    } else if ("-shutdownDatanode".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-shutdownDatanode <datanode_host:ipc_port> [upgrade]]");
    } else if ("-evictWriters".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-evictWriters <datanode_host:ipc_port>]");
    } else if ("-getDatanodeInfo".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-getDatanodeInfo <datanode_host:ipc_port>]");
    } else if ("-triggerBlockReport".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-triggerBlockReport [-incremental] <datanode_host:ipc_port> [-namenode <namenode_host:ipc_port>]]");
    } else if ("-listOpenFiles".equals(cmd)) {
      System.err.println("Usage: hdfs dfsadmin"
          + " [-listOpenFiles [-blockingDecommission] [-path <path>]]");
    } else {
      System.err.println("Usage: hdfs dfsadmin");
      System.err.println("Note: Administrative commands can only be run as the HDFS superuser.");
      System.err.println(commonUsageSummary);
      ToolRunner.printGenericCommandUsage(System.err);
    }
  }