CraftBlockState.java

package org.bukkit.craftbukkit.block;

import net.minecraft.server.BlockPosition;
import org.bukkit.Location;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.Chunk;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.BlockState;
import org.bukkit.craftbukkit.CraftChunk;
import org.bukkit.craftbukkit.CraftWorld;
import org.bukkit.craftbukkit.util.CraftMagicNumbers;
import org.bukkit.material.Attachable;
import org.bukkit.material.MaterialData;
import org.bukkit.metadata.MetadataValue;
import org.bukkit.plugin.Plugin;

import java.util.List;
import net.minecraft.server.EnumDirection;
import net.minecraft.server.IBlockData;
import net.minecraft.server.TileEntity;

public class CraftBlockState implements BlockState {
    private final CraftWorld world;
    private final CraftChunk chunk;
    private final int x;
    private final int y;
    private final int z;
    protected int type;
    protected MaterialData data;
    protected int flag;

    public CraftBlockState(final Block block) {
        this.world = (CraftWorld) block.getWorld();
        this.x = block.getX();
        this.y = block.getY();
        this.z = block.getZ();
        this.type = block.getTypeId();
        this.chunk = (CraftChunk) block.getChunk();
        this.flag = 3;

        createData(block.getData());
    }

    public CraftBlockState(final Block block, int flag) {
        this(block);
        this.flag = flag;
    }

    public CraftBlockState(Material material) {
        world = null;
        type = material.getId();
        chunk = null;
        x = y = z = 0;
    }

    public static CraftBlockState getBlockState(net.minecraft.server.World world, int x, int y, int z) {
        return new CraftBlockState(world.getWorld().getBlockAt(x, y, z));
    }

    public static CraftBlockState getBlockState(net.minecraft.server.World world, int x, int y, int z, int flag) {
        return new CraftBlockState(world.getWorld().getBlockAt(x, y, z), flag);
    }

    @Override
	public World getWorld() {
        requirePlaced();
        return world;
    }

    @Override
	public int getX() {
        return x;
    }

    @Override
	public int getY() {
        return y;
    }

    @Override
	public int getZ() {
        return z;
    }

    @Override
	public Chunk getChunk() {
        requirePlaced();
        return chunk;
    }

    @Override
	public void setData(final MaterialData data) {
        Material mat = getType();

        if ((mat == null) || (mat.getData() == null)) {
            this.data = data;
        } else {
            if ((data.getClass() == mat.getData()) || (data.getClass() == MaterialData.class)) {
                this.data = data;
            } else {
                throw new IllegalArgumentException("Provided data is not of type "
                        + mat.getData().getName() + ", found " + data.getClass().getName());
            }
        }
    }

    @Override
	public MaterialData getData() {
        return data;
    }

    @Override
	public void setType(final Material type) {
        setTypeId(type.getId());
    }

    @Override
	public boolean setTypeId(final int type) {
        if (this.type != type) {
            this.type = type;

            createData((byte) 0);
        }
        return true;
    }

    @Override
	public Material getType() {
        return Material.getMaterial(getTypeId());
    }

    public void setFlag(int flag) {
        this.flag = flag;
    }

    public int getFlag() {
        return flag;
    }

    @Override
	public int getTypeId() {
        return type;
    }

    @Override
	public byte getLightLevel() {
        return getBlock().getLightLevel();
    }

    @Override
	public Block getBlock() {
        requirePlaced();
        return world.getBlockAt(x, y, z);
    }

    @Override
	public boolean update() {
        return update(false);
    }

    @Override
	public boolean update(boolean force) {
        return update(force, true);
    }

    @Override
	public boolean update(boolean force, boolean applyPhysics) {
    	if (!isPlaced()) return true;
        Block block = getBlock();

        if (block.getType() != getType()) {
            if (!force) {
                return false;
            }
        }

        BlockPosition pos = new BlockPosition(x, y, z);
        IBlockData newBlock = CraftMagicNumbers.getBlock(getType()).fromLegacyData(getRawData());
        block.setTypeIdAndData(getTypeId(), getRawData(), applyPhysics);
        world.getHandle().notify(
                pos,
                CraftMagicNumbers.getBlock(block).fromLegacyData(block.getData()),
                newBlock,
                3
        );

        // Update levers etc
        if (applyPhysics && getData() instanceof Attachable) {
            world.getHandle().applyPhysics(pos.shift(CraftBlock.blockFaceToNotch(((Attachable) getData()).getAttachedFace())), newBlock.getBlock(), false);
        }

        return true;
    }

    private void createData(final byte data) {
        Material mat = getType();
        if (mat == null || mat.getData() == null) {
            this.data = new MaterialData(type, data);
        } else {
            this.data = mat.getNewData(data);
        }
    }

    @Override
	public byte getRawData() {
        return data.getData();
    }

    @Override
	public Location getLocation() {
        return new Location(world, x, y, z);
    }

    @Override
	public Location getLocation(Location loc) {
        if (loc != null) {
            loc.setWorld(world);
            loc.setX(x);
            loc.setY(y);
            loc.setZ(z);
            loc.setYaw(0);
            loc.setPitch(0);
        }

        return loc;
    }

    @Override
	public void setRawData(byte data) {
        this.data.setData(data);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final CraftBlockState other = (CraftBlockState) obj;
        if (this.world != other.world && (this.world == null || !this.world.equals(other.world))) {
            return false;
        }
        if (this.x != other.x) {
            return false;
        }
        if (this.y != other.y) {
            return false;
        }
        if (this.z != other.z) {
            return false;
        }
        if (this.type != other.type) {
            return false;
        }
        if (this.data != other.data && (this.data == null || !this.data.equals(other.data))) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 73 * hash + (this.world != null ? this.world.hashCode() : 0);
        hash = 73 * hash + this.x;
        hash = 73 * hash + this.y;
        hash = 73 * hash + this.z;
        hash = 73 * hash + this.type;
        hash = 73 * hash + (this.data != null ? this.data.hashCode() : 0);
        return hash;
    }

    public TileEntity getTileEntity() {
        return null;
    }

    @Override
	public void setMetadata(String metadataKey, MetadataValue newMetadataValue) {
        requirePlaced();
        chunk.getCraftWorld().getBlockMetadata().setMetadata(getBlock(), metadataKey, newMetadataValue);
    }

    @Override
	public List<MetadataValue> getMetadata(String metadataKey) {
        requirePlaced();
        return chunk.getCraftWorld().getBlockMetadata().getMetadata(getBlock(), metadataKey);
    }

    @Override
	public boolean hasMetadata(String metadataKey) {
        requirePlaced();
        return chunk.getCraftWorld().getBlockMetadata().hasMetadata(getBlock(), metadataKey);
    }

    @Override
	public void removeMetadata(String metadataKey, Plugin owningPlugin) {
        requirePlaced();
        chunk.getCraftWorld().getBlockMetadata().removeMetadata(getBlock(), metadataKey, owningPlugin);
    }

    @Override
    public boolean isPlaced() {
        return world != null;
    }

    protected void requirePlaced() {
        if (!isPlaced()) {
            throw new IllegalStateException("The blockState must be placed to call this method");
        }
    }
}