gt:                                 j = blockpos.getY();
context: package net.minecraft.util.math;
  
  import com.google.common.collect.AbstractIterator;
  import com.google.common.collect.Lists;
  import java.util.Iterator;
  import java.util.List;
  import javax.annotation.concurrent.Immutable;
  import net.minecraft.entity.Entity;
  import net.minecraft.util.EnumFacing;
  import net.minecraftforge.fml.relauncher.Side;
  import net.minecraftforge.fml.relauncher.SideOnly;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  @Immutable
  public class BlockPos extends Vec3i
  {
      private static final Logger LOGGER = LogManager.getLogger();
      /** An immutable block pos with zero as all coordinates. */
      public static final BlockPos ORIGIN = new BlockPos(0, 0, 0);
      private static final int NUM_X_BITS = 1 + MathHelper.calculateLogBaseTwo(MathHelper.roundUpToPowerOfTwo(30000000));
      private static final int NUM_Z_BITS = NUM_X_BITS;
      private static final int NUM_Y_BITS = 64 - NUM_X_BITS - NUM_Z_BITS;
      private static final int Y_SHIFT = 0 + NUM_Z_BITS;
      private static final int X_SHIFT = Y_SHIFT + NUM_Y_BITS;
      private static final long X_MASK = (1L << NUM_X_BITS) - 1L;
      private static final long Y_MASK = (1L << NUM_Y_BITS) - 1L;
      private static final long Z_MASK = (1L << NUM_Z_BITS) - 1L;
  
      public BlockPos(int x, int y, int z)
      {
          super(x, y, z);
      }
  
      public BlockPos(double x, double y, double z)
      {
          super(x, y, z);
      }
  
      public BlockPos(Entity source)
      {
          this(source.posX, source.posY, source.posZ);
      }
  
      public BlockPos(Vec3d vec)
      {
          this(vec.xCoord, vec.yCoord, vec.zCoord);
      }
  
      public BlockPos(Vec3i source)
      {
          this(source.getX(), source.getY(), source.getZ());
      }
  
      /**
       * Add the given coordinates to the coordinates of this BlockPos
       */
      public BlockPos add(double x, double y, double z)
      {
          return x == 0.0D && y == 0.0D && z == 0.0D ? this : new BlockPos((double)this.getX() + x, (double)this.getY() + y, (double)this.getZ() + z);
      }
  
      /**
       * Add the given coordinates to the coordinates of this BlockPos
       */
      public BlockPos add(int x, int y, int z)
      {
          return x == 0 && y == 0 && z == 0 ? this : new BlockPos(this.getX() + x, this.getY() + y, this.getZ() + z);
      }
  
      /**
       * Add the given Vector to this BlockPos
       */
      public BlockPos add(Vec3i vec)
      {
          return vec.getX() == 0 && vec.getY() == 0 && vec.getZ() == 0 ? this : new BlockPos(this.getX() + vec.getX(), this.getY() + vec.getY(), this.getZ() + vec.getZ());
      }
  
      /**
       * Subtract the given Vector from this BlockPos
       */
      public BlockPos subtract(Vec3i vec)
      {
          return vec.getX() == 0 && vec.getY() == 0 && vec.getZ() == 0 ? this : new BlockPos(this.getX() - vec.getX(), this.getY() - vec.getY(), this.getZ() - vec.getZ());
      }
  
      /**
       * Offset this BlockPos 1 block up
       */
      public BlockPos up()
      {
          return this.up(1);
      }
  
      /**
       * Offset this BlockPos n blocks up
       */
      public BlockPos up(int n)
      {
          return this.offset(EnumFacing.UP, n);
      }
  
      /**
       * Offset this BlockPos 1 block down
       */
      public BlockPos down()
      {
          return this.down(1);
      }
  
      /**
       * Offset this BlockPos n blocks down
       */
      public BlockPos down(int n)
      {
          return this.offset(EnumFacing.DOWN, n);
      }
  
      /**
       * Offset this BlockPos 1 block in northern direction
       */
      public BlockPos north()
      {
          return this.north(1);
      }
  
      /**
       * Offset this BlockPos n blocks in northern direction
       */
      public BlockPos north(int n)
      {
          return this.offset(EnumFacing.NORTH, n);
      }
  
      /**
       * Offset this BlockPos 1 block in southern direction
       */
      public BlockPos south()
      {
          return this.south(1);
      }
  
      /**
       * Offset this BlockPos n blocks in southern direction
       */
      public BlockPos south(int n)
      {
          return this.offset(EnumFacing.SOUTH, n);
      }
  
      /**
       * Offset this BlockPos 1 block in western direction
       */
      public BlockPos west()
      {
          return this.west(1);
      }
  
      /**
       * Offset this BlockPos n blocks in western direction
       */
      public BlockPos west(int n)
      {
          return this.offset(EnumFacing.WEST, n);
      }
  
      /**
       * Offset this BlockPos 1 block in eastern direction
       */
      public BlockPos east()
      {
          return this.east(1);
      }
  
      /**
       * Offset this BlockPos n blocks in eastern direction
       */
      public BlockPos east(int n)
      {
          return this.offset(EnumFacing.EAST, n);
      }
  
      /**
       * Offset this BlockPos 1 block in the given direction
       */
      public BlockPos offset(EnumFacing facing)
      {
          return this.offset(facing, 1);
      }
  
      /**
       * Offsets this BlockPos n blocks in the given direction
       */
      public BlockPos offset(EnumFacing facing, int n)
      {
          return n == 0 ? this : new BlockPos(this.getX() + facing.getFrontOffsetX() * n, this.getY() + facing.getFrontOffsetY() * n, this.getZ() + facing.getFrontOffsetZ() * n);
      }
  
      /**
       * Calculate the cross product of this and the given Vector
       */
      public BlockPos crossProduct(Vec3i vec)
      {
          return new BlockPos(this.getY() * vec.getZ() - this.getZ() * vec.getY(), this.getZ() * vec.getX() - this.getX() * vec.getZ(), this.getX() * vec.getY() - this.getY() * vec.getX());
      }
  
      /**
       * Serialize this BlockPos into a long value
       */
      public long toLong()
      {
          return ((long)this.getX() & X_MASK) << X_SHIFT | ((long)this.getY() & Y_MASK) << Y_SHIFT | ((long)this.getZ() & Z_MASK) << 0;
      }
  
      /**
       * Create a BlockPos from a serialized long value (created by toLong)
       */
      public static BlockPos fromLong(long serialized)
      {
          int i = (int)(serialized << 64 - X_SHIFT - NUM_X_BITS >> 64 - NUM_X_BITS);
          int j = (int)(serialized << 64 - Y_SHIFT - NUM_Y_BITS >> 64 - NUM_Y_BITS);
          int k = (int)(serialized << 64 - NUM_Z_BITS >> 64 - NUM_Z_BITS);
          return new BlockPos(i, j, k);
      }
  
      /**
       * Create an Iterable that returns all positions in the box specified by the given corners
       */
      public static Iterable<BlockPos> getAllInBox(BlockPos from, BlockPos to)
      {
          final BlockPos blockpos = new BlockPos(Math.min(from.getX(), to.getX()), Math.min(from.getY(), to.getY()), Math.min(from.getZ(), to.getZ()));
          final BlockPos blockpos1 = new BlockPos(Math.max(from.getX(), to.getX()), Math.max(from.getY(), to.getY()), Math.max(from.getZ(), to.getZ()));
          return new Iterable<BlockPos>()
          {
              public Iterator<BlockPos> iterator()
              {
                  return new AbstractIterator<BlockPos>()
                  {
                      private BlockPos lastReturned;
                      protected BlockPos computeNext()
                      {
                          if (this.lastReturned == null)
                          {
                              this.lastReturned = blockpos;
                              return this.lastReturned;
                          }
                          else if (this.lastReturned.equals(blockpos1))
                          {
                              return (BlockPos)this.endOfData();
                          }
                          else
                          {
                              int i = this.lastReturned.getX();
                              int j = this.lastReturned.getY();
                              int k = this.lastReturned.getZ();
  
                              if (i < blockpos1.getX())
                              {
                                  ++i;
                              }
                              else if (j < blockpos1.getY())
                              {
                                  i = blockpos.getX();
                                  ++j;
                              }
                              else if (k < blockpos1.getZ())
                              {
                                  i = blockpos.getX();
  