ForgeMultipart/codechicken/multipart/minecraft/McSidedMetaPart.java

package codechicken.multipart.minecraft;

import net.minecraft.item.ItemStack;
import net.minecraftforge.common.ForgeDirection;
import codechicken.lib.vec.BlockCoord;
import codechicken.lib.vec.Vector3;
import codechicken.multipart.TileMultipart;

public abstract class McSidedMetaPart extends McMetaPart
{
    public McSidedMetaPart()
    {
    }
    
    public McSidedMetaPart(int meta)
    {
        super(meta);
    }
    
    public abstract int sideForMeta(int meta);
    
    @Override
    public void onNeighborChanged()
    {
        if(!world().isRemote)
            dropIfCantStay();
    }
    
    public boolean canStay()
    {
        BlockCoord pos = new BlockCoord(getTile()).offset(sideForMeta(meta));
        return world().isBlockSolidOnSide(pos.x, pos.y, pos.z, ForgeDirection.getOrientation(sideForMeta(meta)^1));
    }
    
    public boolean dropIfCantStay()
    {
        if(!canStay())
        {
            drop();
            return true;
        }
        return false;
    }

    public void drop()
    {
        tile().remPart(this);
        TileMultipart.dropItem(new ItemStack(getBlock()), world(), Vector3.fromTileEntityCenter(getTile()));
    }
}