Examples of org.apache.hadoop.tools.TableListing$Column

org.apache.hadoop.tools.TableListing
This class implements a "table listing" with column headers. Example: NAME OWNER GROUP MODE WEIGHT pool1 andrew andrew rwxr-xr-x 100 pool2 andrew andrew rwxr-xr-x 100 pool3 andrew andrew rwxr-xr-x 100

            addField("BYTES_CACHED", Justification.RIGHT).
            addField("BYTES_OVERLIMIT", Justification.RIGHT).
            addField("FILES_NEEDED", Justification.RIGHT).
            addField("FILES_CACHED", Justification.RIGHT);
      }
      TableListing listing = builder.build();
      int numResults = 0;
      try {
        RemoteIterator<CachePoolEntry> iter = dfs.listCachePools();
        while (iter.hasNext()) {
          CachePoolEntry entry = iter.next();
          CachePoolInfo info = entry.getInfo();
          LinkedList<String> row = new LinkedList<String>();
          if (name == null || info.getPoolName().equals(name)) {
            row.add(info.getPoolName());
            row.add(info.getOwnerName());
            row.add(info.getGroupName());
            row.add(info.getMode() != null ? info.getMode().toString() : null);
            Long limit = info.getLimit();
            String limitString;
            if (limit != null && limit.equals(CachePoolInfo.LIMIT_UNLIMITED)) {
              limitString = "unlimited";
            } else {
              limitString = "" + limit;
            }
            row.add(limitString);
            Long maxTtl = info.getMaxRelativeExpiryMs();
            String maxTtlString = null;


            if (maxTtl != null) {
              if (maxTtl.longValue() == CachePoolInfo.RELATIVE_EXPIRY_NEVER) {
                maxTtlString  = "never";
              } else {
                maxTtlString = DFSUtil.durationToString(maxTtl);
              }
            }
            row.add(maxTtlString);
            if (printStats) {
              CachePoolStats stats = entry.getStats();
              row.add(Long.toString(stats.getBytesNeeded()));
              row.add(Long.toString(stats.getBytesCached()));
              row.add(Long.toString(stats.getBytesOverlimit()));
              row.add(Long.toString(stats.getFilesNeeded()));
              row.add(Long.toString(stats.getFilesCached()));
            }
            listing.addRow(row.toArray(new String[] {}));
            ++numResults;
            if (name != null) {
              break;
            }
          }

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      return "[-help <command-name>]\n";
    }


    @Override
    public String getLongUsage() {
      TableListing listing = getOptionDescriptionListing();
      listing.addRow("<command-name>", "The command for which to get " +
          "detailed help. If no command is specified, print detailed help for " +
          "all commands");
      return getShortUsage() + "\n" +
        "Get detailed help about a command.\n\n" +
        listing.toString();
    }

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    out.println(usagePrefix + " " + instance.getUsage());
  }


  private void printInstanceHelp(PrintStream out, Command instance) {
    out.println(instance.getUsage() + " :");
    TableListing listing = null;
    final String prefix = "  ";
    for (String line : instance.getDescription().split("\n")) {
      if (line.matches("^[ \t]*[-<].*$")) {
        String[] segments = line.split(":");
        if (segments.length == 2) {
          if (listing == null) {
            listing = createOptionTableListing();
          }
          listing.addRow(segments[0].trim(), segments[1].trim());
          continue;
        }
      }


      // Normal literal description.
      if (listing != null) {
        for (String listingLine : listing.toString().split("\n")) {
          out.println(prefix + listingLine);
        }
        listing = null;
      }


      for (String descLine : WordUtils.wrap(
          line, MAX_LINE_WIDTH, "\n", true).split("\n")) {
        out.println(prefix + descLine);
      }
    }


    if (listing != null) {
      for (String listingLine : listing.toString().split("\n")) {
        out.println(prefix + listingLine);
      }
    }
  }

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