content: package net.minecraft.command.server;
  
  import net.minecraft.block.Block;
  import net.minecraft.block.state.IBlockState;
  import net.minecraft.command.*;
  import net.minecraft.nbt.JsonToNBT;
  import net.minecraft.nbt.NBTException;
  import net.minecraft.nbt.NBTTagCompound;
  import net.minecraft.nbt.NBTUtil;
  import net.minecraft.tileentity.TileEntity;
  import net.minecraft.util.BlockPos;
  import net.minecraft.world.World;
  
  import java.util.List;
  
  public class CommandTestForBlock extends CommandBase {
      public String getCommandName() {
          return "testforblock";
      }
  
      public int getRequiredPermissionLevel() {
          return 2;
      }
  
      public String getCommandUsage(ICommandSender sender) {
          return "commands.testforblock.usage";
      }
  
      public void processCommand(ICommandSender sender, String[] args) throws CommandException {
          if (args.length < 4) {
              throw new WrongUsageException("commands.testforblock.usage");
          } else {
              sender.setCommandStat(CommandResultStats.Type.AFFECTED_BLOCKS, 0);
              BlockPos blockpos = parseBlockPos(sender, args, 0, false);
              Block block = Block.getBlockFromName(args[3]);
  
              if (block == null) {
                  throw new NumberInvalidException("commands.setblock.notFound", args[3]);
              } else {
                  int i = -1;
  
                  if (args.length >= 5) {
                      i = parseInt(args[4], -1, 15);
                  }
  
                  World world = sender.getEntityWorld();
  
                  if (!world.isBlockLoaded(blockpos)) {
                      throw new CommandException("commands.testforblock.outOfWorld");
                  } else {
                      NBTTagCompound nbttagcompound = new NBTTagCompound();
                      boolean flag = false;
  
                      if (args.length >= 6 && block.hasTileEntity()) {
                          String s = getChatComponentFromNthArg(sender, args, 5).getUnformattedText();
  
                          try {
                              nbttagcompound = JsonToNBT.getTagFromJson(s);
                              flag = true;
                          } catch (NBTException nbtexception) {
                              throw new CommandException("commands.setblock.tagError", nbtexception.getMessage());
                          }
                      }
  
                      IBlockState iblockstate = world.getBlockState(blockpos);
                      Block block1 = iblockstate.getBlock();
  
                      if (block1 != block) {
                          throw new CommandException("commands.testforblock.failed.tile", Integer.valueOf(blockpos.getX()), Integer.valueOf(blockpos.getY()), Integer.valueOf(blockpos.getZ()), block1.getLocalizedName(), block.getLocalizedName());
                      } else {
                          if (i > -1) {
                              int j = iblockstate.getBlock().getMetaFromState(iblockstate);
  
                              if (j != i) {
                                  throw new CommandException("commands.testforblock.failed.data", Integer.valueOf(blockpos.getX()), Integer.valueOf(blockpos.getY()), Integer.valueOf(blockpos.getZ()), Integer.valueOf(j), Integer.valueOf(i));
                              }
                          }
  
                          if (flag) {
                              TileEntity tileentity = world.getTileEntity(blockpos);
  
                              if (tileentity == null) {
                                  throw new CommandException("commands.testforblock.failed.tileEntity", Integer.valueOf(blockpos.getX()), Integer.valueOf(blockpos.getY()), Integer.valueOf(blockpos.getZ()));
                              }
  
                              NBTTagCompound nbttagcompound1 = new NBTTagCompound();
                              tileentity.writeToNBT(nbttagcompound1);
  
                              if (!NBTUtil.func_181123_a(nbttagcompound, nbttagcompound1, true)) {
                                  throw new CommandException("commands.testforblock.failed.nbt", Integer.valueOf(blockpos.getX()), Integer.valueOf(blockpos.getY()), Integer.valueOf(blockpos.getZ()));
                              }
                          }
  
                          sender.setCommandStat(CommandResultStats.Type.AFFECTED_BLOCKS, 1);
                          notifyOperators(sender, this, "commands.testforblock.success", Integer.valueOf(blockpos.getX()), Integer.valueOf(blockpos.getY()), Integer.valueOf(blockpos.getZ()));
                      }
                  }
              }
          }
      }
  
      public List<String> addTabCompletionOptions(ICommandSender sender, String[] args, BlockPos pos) {
          return args.length > 0 && args.length <= 3 ? func_175771_a(args, 0, pos) : (args.length == 4 ? getListOfStringsMatchingLastWord(args, Block.blockRegistry.getKeys()) : null);
      }
  }
  