gt:                 redone = sess.redo(session.getBlockBag(player), player);
context: /*
   * WorldEdit, a Minecraft world manipulation toolkit
   * Copyright (C) sk89q <http://www.sk89q.com>
   * Copyright (C) WorldEdit team and contributors
   *
   * This program is free software: you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by the
   * Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
   * for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License
   * along with this program. If not, see <http://www.gnu.org/licenses/>.
   */
  
  package com.sk89q.worldedit.command;
  
  import com.boydti.fawe.Fawe;
  import com.boydti.fawe.FaweAPI;
  import com.boydti.fawe.config.BBC;
  import com.boydti.fawe.config.Settings;
  import com.boydti.fawe.database.DBHandler;
  import com.boydti.fawe.database.RollbackDatabase;
  import com.boydti.fawe.logging.rollback.RollbackOptimizedHistory;
  import com.boydti.fawe.object.FawePlayer;
  import com.boydti.fawe.object.FaweQueue;
  import com.boydti.fawe.object.RegionWrapper;
  import com.boydti.fawe.object.RunnableVal;
  import com.boydti.fawe.object.changeset.DiskStorageHistory;
  import com.boydti.fawe.regions.FaweMaskManager;
  import com.boydti.fawe.util.MainUtil;
  import com.boydti.fawe.util.MathMan;
  import com.sk89q.minecraft.util.commands.Command;
  import com.sk89q.minecraft.util.commands.CommandContext;
  import com.sk89q.minecraft.util.commands.CommandPermissions;
  import com.sk89q.worldedit.*;
  import com.sk89q.worldedit.entity.Player;
  import com.sk89q.worldedit.regions.Region;
  import com.sk89q.worldedit.util.command.binding.Range;
  import com.sk89q.worldedit.util.command.binding.Switch;
  import com.sk89q.worldedit.util.command.parametric.Optional;
  import com.sk89q.worldedit.world.World;
  import java.io.File;
  import java.util.UUID;
  import java.util.concurrent.atomic.AtomicInteger;
  
  /**
   * Commands to undo, redo, and clear history.
   */
  @Command(aliases = {}, desc = "Commands to undo, redo, and clear history: [More Info](http://wiki.sk89q.com/wiki/WorldEdit/Features#History)")
  public class HistoryCommands extends MethodCommands {
  
      /**
       * Create a new instance.
       *
       * @param worldEdit reference to WorldEdit
       */
      public HistoryCommands(WorldEdit worldEdit) {
          super(worldEdit);
      }
  
  
      @Command(
              aliases = {"/frb", "frb", "fawerollback", "/fawerollback", "/rollback"},
              usage = "<user=Empire92> <radius=5> <time=3d4h>",
              desc = "Undo a specific edit. " +
                      " - The time uses s, m, h, d, y.\n" +
                      " - Import from disk: /frb #import",
              min = 1,
              max = 3
      )
      @CommandPermissions("worldedit.history.rollback")
      public void faweRollback(final Player player, LocalSession session, final String user, @Optional("0") @Range(min = 0) int radius, @Optional("0") String time, @Switch('r') boolean restore) throws WorldEditException {
          if (!Settings.IMP.HISTORY.USE_DATABASE) {
              BBC.SETTING_DISABLE.send(player, "history.use-database (Import with /frb #import )");
              return;
          }
          switch (user.charAt(0)) {
              case '#': {
                  if (user.equals("#import")) {
                      if (!player.hasPermission("fawe.rollback.import")) {
                          BBC.NO_PERM.send(player, "fawe.rollback.import");
                          return;
                      }
                      File folder = MainUtil.getFile(Fawe.imp().getDirectory(), Settings.IMP.PATHS.HISTORY);
                      if (!folder.exists()) {
                          return;
                      }
                      for (File worldFolder : folder.listFiles()) {
                          if (!worldFolder.isDirectory()) {
                              continue;
                          }
                          String worldName = worldFolder.getName();
                          World world = FaweAPI.getWorld(worldName);
                          if (world != null) {
                              for (File userFolder : worldFolder.listFiles()) {
                                  if (!userFolder.isDirectory()) {
                                      continue;
                                  }
                                  String userUUID = userFolder.getName();
                                  try {
                                      UUID uuid = UUID.fromString(userUUID);
                                      for (File historyFile : userFolder.listFiles()) {
                                          String name = historyFile.getName();
                                          if (!name.endsWith(".bd")) {
                                              continue;
                                          }
                                          RollbackOptimizedHistory rollback = new RollbackOptimizedHistory(world, uuid, Integer.parseInt(name.substring(0, name.length() - 3)));
                                          DiskStorageHistory.DiskStorageSummary summary = rollback.summarize(RegionWrapper.GLOBAL(), false);
                                          if (summary != null) {
                                              rollback.setDimensions(new Vector(summary.minX, 0, summary.minZ), new Vector(summary.maxX, 255, summary.maxZ));
                                              rollback.setTime(historyFile.lastModified());
                                              RollbackDatabase db = DBHandler.IMP.getDatabase(world);
                                              db.logEdit(rollback);
                                              player.print(BBC.getPrefix() + "Logging: " + historyFile);
                                          }
                                      }
                                  } catch (IllegalArgumentException e) {
                                      e.printStackTrace();
                                      continue;
                                  }
                              }
                          }
                      }
                      player.print(BBC.getPrefix() + "Done import!");
                      return;
                  }
                  String toParse = user.substring(1);
                  if (!MathMan.isInteger(toParse)) {
                      BBC.COMMAND_SYNTAX.send(player, "/frb #<index>");
                      return;
                  }
                  int index = Integer.parseInt(toParse);
                  final World world = player.getWorld();
                  UUID uuid = player.getUniqueId();
                  DiskStorageHistory file = new DiskStorageHistory(world, uuid, index);
                  if (file.getBDFile().exists()) {
                      if (restore) file.redo(FawePlayer.wrap(player));
                      else file.undo(FawePlayer.wrap(player));
                      BBC.ROLLBACK_ELEMENT.send(player, Fawe.imp().getWorldName(world) + "/" + user + "-" + index);
                  } else {
                      BBC.TOOL_INSPECT_INFO_FOOTER.send(player, 0);
                  }
                  return;
              }
          }
          UUID other = user.equalsIgnoreCase("*") ? null : Fawe.imp().getUUID(user);
          if (other == null && !user.equalsIgnoreCase("*")) {
              BBC.PLAYER_NOT_FOUND.send(player, user);
              return;
          }
          if (radius == 0) {
              BBC.COMMAND_SYNTAX.send(player, "/frb " + user + " <radius> <time>");
              return;
          }
          long timeDiff = MainUtil.timeToSec(time) * 1000;
          if (timeDiff == 0) {
              BBC.COMMAND_SYNTAX.send(player, "/frb " + user + " " + radius + " <time>");
              return;
          }
          radius = Math.max(radius, 0);
          if (radius > 500) {
              if (!player.hasPermission("fawe.admin")) {
                  BBC.WORLDEDIT_CANCEL_REASON_MAX_CHECKS.send(player);
                  return;
              }
          }
          final World world = player.getWorld();
          WorldVector origin = player.getPosition();
          Vector bot = origin.subtract(radius, radius, radius);
          bot.mutY(Math.max(0, bot.getY()));
          Vector top = origin.add(radius, radius, radius);
          top.mutY(Math.min(255, top.getY()));
          RollbackDatabase database = DBHandler.IMP.getDatabase(world);
          final AtomicInteger count = new AtomicInteger();
          final FawePlayer fp = FawePlayer.wrap(player);
  
          final FaweQueue finalQueue;
          Region[] allowedRegions = fp.getCurrentRegions(FaweMaskManager.MaskType.OWNER);
          if (allowedRegions == null) {
              BBC.NO_REGION.send(fp);
              return;
          }
          // TODO mask the regions bot / top to the bottom and top coord in the allowedRegions
          // TODO: then mask the edit to the bot / top
  //        if (allowedRegions.length != 1 || !allowedRegions[0].isGlobal()) {
  //            finalQueue = new MaskedFaweQueue(SetQueue.IMP.getNewQueue(fp.getWorld(), true, false), allowedRegions);
  //        } else {
  //            finalQueue = SetQueue.IMP.getNewQueue(fp.getWorld(), true, false);
  //        }
          database.getPotentialEdits(other, System.currentTimeMillis() - timeDiff, bot, top, new RunnableVal<DiskStorageHistory>() {
              @Override
              public void run(DiskStorageHistory edit) {
                  if (restore) edit.redo(fp, allowedRegions);
                  else edit.undo(fp, allowedRegions);
                  BBC.ROLLBACK_ELEMENT.send(player, Fawe.imp().getWorldName(edit.getWorld()) + "/" + user + "-" + edit.getIndex());
                  count.incrementAndGet();
              }
              }, new Runnable() {
                  @Override
                  public void run() {
                      BBC.TOOL_INSPECT_INFO_FOOTER.send(player, count);
                  }
              }, true, restore);
      }
  
      @Command(
              aliases = {"/fawerestore", "/frestore"},
              usage = "<user=Empire92|*> <radius=5> <time=3d4h>",
              desc = "Redo a specific edit. " +
                      " - The time uses s, m, h, d, y.\n" +
                      " - Import from disk: /frb #import",
              min = 1,
              max = 3
      )
      @CommandPermissions("worldedit.history.rollback")
      public void restore(final Player player, LocalSession session, final String user, @Optional("0") @Range(min = 0) int radius, @Optional("0") String time) throws WorldEditException {
          faweRollback(player, session, user, radius, time, true);
      }
  
      @Command(
              aliases = {"/undo", "undo"},
              usage = "[times] [player]",
              desc = "Undoes the last action",
              min = 0,
              max = 2
      )
      @CommandPermissions("worldedit.history.undo")
      public void undo(Player player, LocalSession session, CommandContext context) throws WorldEditException {
          int times = Math.max(1, context.getInteger(0, 1));
          if (times > 50) {
              FawePlayer.wrap(player).checkConfirmation(getArguments(context), times, 50);
          }
          for (int i = 0; i < times; ++i) {
              EditSession undone;
              if (context.argsLength() < 2) {
                  undone = session.undo(session.getBlockBag(player), player);
              } else {
                  player.checkPermission("worldedit.history.undo.other");
                  LocalSession sess = worldEdit.getSession(context.getString(1));
                  if (sess == null) {
                      BBC.COMMAND_HISTORY_OTHER_ERROR.send(player, context.getString(1));
                      break;
                  }
                  undone = sess.undo(session.getBlockBag(player), player);
              }
              if (undone != null) {
                  BBC.COMMAND_UNDO_SUCCESS.send(player);
                  worldEdit.flushBlockBag(player, undone);
              } else {
                  BBC.COMMAND_UNDO_ERROR.send(player);
                  break;
              }
          }
      }
  
      @Command(
              aliases = {"/redo", "redo"},
              usage = "[times] [player]",
              desc = "Redoes the last action (from history)",
              min = 0,
              max = 2
      )
      @CommandPermissions("worldedit.history.redo")
      public void redo(Player player, LocalSession session, CommandContext args) throws WorldEditException {
  
          int times = Math.max(1, args.getInteger(0, 1));
  
          for (int i = 0; i < times; ++i) {
              EditSession redone;
              if (args.argsLength() < 2) {
                  redone = session.redo(session.getBlockBag(player), player);
              } else {
                  player.checkPermission("worldedit.history.redo.other");
                  LocalSession sess = worldEdit.getSession(args.getString(1));
                  if (sess == null) {
                      BBC.COMMAND_HISTORY_OTHER_ERROR.send(player, args.getString(1));
                      break;
                  }
  