ChunkCache.java

package net.minecraft.world;

import net.minecraft.block.material.Material;
import net.minecraft.block.state.IBlockState;
import net.minecraft.init.Blocks;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.BlockPos;
import net.minecraft.util.EnumFacing;
import net.minecraft.world.chunk.Chunk;

public class ChunkCache implements IBlockAccess
{
    protected int chunkX;
    protected int chunkZ;
    protected Chunk[][] chunkArray;

    /** set by !chunk.getAreLevelsEmpty */
    protected boolean hasExtendedLevels;

    /** Reference to the World object. */
    protected World worldObj;
    private static final String __OBFID = "CL_00000155";

    public ChunkCache(World worldIn, BlockPos p_i45746_2_, BlockPos p_i45746_3_, int p_i45746_4_)
    {
        this.worldObj = worldIn;
        this.chunkX = p_i45746_2_.getX() - p_i45746_4_ >> 4;
        this.chunkZ = p_i45746_2_.getZ() - p_i45746_4_ >> 4;
        int var5 = p_i45746_3_.getX() + p_i45746_4_ >> 4;
        int var6 = p_i45746_3_.getZ() + p_i45746_4_ >> 4;
        this.chunkArray = new Chunk[var5 - this.chunkX + 1][var6 - this.chunkZ + 1];
        this.hasExtendedLevels = true;
        int var7;
        int var8;

        for (var7 = this.chunkX; var7 <= var5; ++var7)
        {
            for (var8 = this.chunkZ; var8 <= var6; ++var8)
            {
                this.chunkArray[var7 - this.chunkX][var8 - this.chunkZ] = worldIn.getChunkFromChunkCoords(var7, var8);
            }
        }

        for (var7 = p_i45746_2_.getX() >> 4; var7 <= p_i45746_3_.getX() >> 4; ++var7)
        {
            for (var8 = p_i45746_2_.getZ() >> 4; var8 <= p_i45746_3_.getZ() >> 4; ++var8)
            {
                Chunk var9 = this.chunkArray[var7 - this.chunkX][var8 - this.chunkZ];

                if (var9 != null && !var9.getAreLevelsEmpty(p_i45746_2_.getY(), p_i45746_3_.getY()))
                {
                    this.hasExtendedLevels = false;
                }
            }
        }
    }

    public TileEntity getTileEntity(BlockPos pos)
    {
        int var2 = (pos.getX() >> 4) - this.chunkX;
        int var3 = (pos.getZ() >> 4) - this.chunkZ;
        return this.chunkArray[var2][var3].func_177424_a(pos, Chunk.EnumCreateEntityType.IMMEDIATE);
    }

    public IBlockState getBlockState(BlockPos pos)
    {
        if (pos.getY() >= 0 && pos.getY() < 256)
        {
            int var2 = (pos.getX() >> 4) - this.chunkX;
            int var3 = (pos.getZ() >> 4) - this.chunkZ;

            if (var2 >= 0 && var2 < this.chunkArray.length && var3 >= 0 && var3 < this.chunkArray[var2].length)
            {
                Chunk var4 = this.chunkArray[var2][var3];

                if (var4 != null)
                {
                    return var4.getBlockState(pos);
                }
            }
        }

        return Blocks.air.getDefaultState();
    }

    public boolean isAirBlock(BlockPos pos)
    {
        return this.getBlockState(pos).getBlock().getMaterial() == Material.air;
    }

    public int getStrongPower(BlockPos pos, EnumFacing direction)
    {
        IBlockState var3 = this.getBlockState(pos);
        return var3.getBlock().isProvidingStrongPower(this, pos, var3, direction);
    }
}