code for the railcraft villager stuff

ComponentWorkshop.java

package buildcraftAdditions.villager;

import java.util.List;
import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.init.Blocks;
import net.minecraft.world.World;
import net.minecraft.world.gen.structure.StructureBoundingBox;
import net.minecraft.world.gen.structure.StructureComponent;
import net.minecraft.world.gen.structure.StructureVillagePieces;
import net.minecraft.world.gen.structure.StructureVillagePieces.Start;

public class ComponentWorkshop extends StructureVillagePieces.House1 {
	
	private int averageGroundLevel = -1;
	public ComponentWorkshop(){}

	public ComponentWorkshop(Start villagePiece, int par2, Random par3Random, StructureBoundingBox par4StructureBoundingBox, int par5){
    	super();
        this.coordBaseMode = par5;
        this.boundingBox = par4StructureBoundingBox;
        
    }
	
    public static ComponentWorkshop buildComponent (Start villagePiece, List pieces, Random random, int p1, int p2, int p3, int p4, int p5){
    	StructureBoundingBox structureboundingbox = StructureBoundingBox.getComponentToAddBoundingBox(p1, p2, p3, 0, 0, 0, 6, 6, 12, p4);
        return canVillageGoDeeper(structureboundingbox) && StructureComponent.findIntersecting(pieces, structureboundingbox) == null ? new ComponentWorkshop(villagePiece, p5, random, structureboundingbox, p4) : null;
    }
    
    @Override
    public boolean addComponentParts (World world, Random random, StructureBoundingBox sbb)
    {
        if (this.averageGroundLevel < 0)
        {
            this.averageGroundLevel = this.getAverageGroundLevel(world, sbb);

            if (this.averageGroundLevel < 0)
            {
                return true;
            }

            this.boundingBox.offset(0, this.averageGroundLevel - this.boundingBox.maxY + 4, 0);
        }
        int i = this.boundingBox.minX;
        int j = this.boundingBox.minY;
        int k = this.boundingBox.minZ;
        
        //floor
        fillWithBlocks(world, sbb, 0, 0, 0, 6, 0, 12, Blocks.planks, Blocks.planks, false);
        fillWithBlocks(world, sbb, 3, 1, 0, 3, 1, 12, Blocks.rail, Blocks.rail, false);
        
        //ceiling
        
        fillWithBlocks(world, sbb, 0, 5, 0, 0, 5, 12, Blocks.stone_brick_stairs, Blocks.stone_brick_stairs, false);
        fillWithBlocks(world, sbb, 1, 5, 0, 1, 5, 12, Blocks.stonebrick, Blocks.stonebrick, false);
        fillWithBlocks(world, sbb, 1, 6, 0, 1, 6, 12, Blocks.stone_brick_stairs, Blocks.stone_brick_stairs, false);
        fillWithBlocks(world, sbb, 2, 6, 0, 2, 6, 12, Blocks.stonebrick, Blocks.stonebrick, false);
        fillWithBlocks(world, sbb, 2, 7, 0, 2, 7, 12, Blocks.stone_brick_stairs, Blocks.stone_brick_stairs, false);
        fillWithBlocks(world, sbb, 3, 7, 0, 3, 7, 12, Blocks.stonebrick, Blocks.stonebrick, false);
        fillWithBlocks(world, sbb, 4, 6, 0, 4, 6, 12, Blocks.stonebrick, Blocks.stonebrick, false);
        fillWithBlocks(world, sbb, 5, 5, 0, 5, 5, 12, Blocks.stonebrick, Blocks.stonebrick, false);
        fillWithBlocks(world, sbb, 5, 6, 0, 5, 6, 12, Blocks.stonebrick, Blocks.stonebrick, false);
        
        //these stairs have to be done like this or they will be rotaded the wrong way
  		world.setBlock(i + 4, j + 7, k + 0, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 1, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 2, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 3, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 4, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 5, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 6, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 7, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 8, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 9, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 10, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 11, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 4, j + 7, k + 12, Blocks.stone_brick_stairs, 1, 0x20);
  		world.setBlock(i + 5, j + 6, k + 0, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 1, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 2, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 3, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 4, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 5, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 6, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 7, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 8, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 9, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 10, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 11, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 5, j + 6, k + 12, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 0, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 1, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 2, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 3, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 4, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 5, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 6, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 7, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 8, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 9, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 10, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 11, Blocks.stone_brick_stairs, 1, 0x20);
		world.setBlock(i + 6, j + 5, k + 12, Blocks.stone_brick_stairs, 1, 0x20);
        
        //walls
        fillWithBlocks(world, sbb, 6, 1, 0, 6, 4, 12, Blocks.brick_block, Blocks.brick_block, false);
        fillWithBlocks(world, sbb, 0, 1, 0, 0, 4, 12, Blocks.brick_block, Blocks.brick_block, false);
      
        

        //put the sky windows in
		world.setBlock(i + 3, j + 7, k + 3, Blocks.stained_glass, 9, 0x20);
		world.setBlock(i + 3, j + 7, k + 6, Blocks.stained_glass, 9, 0x02);
		world.setBlock(i + 3, j + 7, k + 9, Blocks.stained_glass, 9, 0x02);
		
		//crafting table, might be swiched for a rolling machine or another railcraft crafting machine?
		world.setBlock(i + 5, j + 1, k + 5, Blocks.crafting_table);
		
		//torches on the wall, also have to be done like this or they will fall on the ground
		world.setBlock(i + 1, j + 4, k + 0, Blocks.torch, 1, 0x20);
		world.setBlock(i + 1, j + 4, k + 3, Blocks.torch, 1, 0x20);
		world.setBlock(i + 1, j + 4, k + 6, Blocks.torch, 1, 0x20);
		world.setBlock(i + 1, j + 4, k + 9, Blocks.torch, 1, 0x20);
		world.setBlock(i + 1, j + 4, k + 12, Blocks.torch, 1, 0x20);
		world.setBlock(i + 5, j + 4, k + 0, Blocks.torch, 2, 0x20);
		world.setBlock(i + 5, j + 4, k + 3, Blocks.torch, 2, 0x20);
		world.setBlock(i + 5, j + 4, k + 6, Blocks.torch, 2, 0x20);
		world.setBlock(i + 5, j + 4, k + 9, Blocks.torch, 2, 0x20);
		world.setBlock(i + 5, j + 4, k + 12, Blocks.torch, 2, 0x20);
        
        spawnVillagers(world, sbb, 0, 0, 0, 2);
        return true;
    }
    
    @Override
    protected int getVillagerType (int par1)
    {
        return 456;
    }
}

main file.java

// this code goes intro the init of the mod

VillagerRegistry.instance().registerVillagerId(456);
		VillagerRegistry.instance().registerVillagerSkin(456, texture);
        VillagerRegistry.instance().registerVillageTradeHandler(456, new VillagerTradeHandler());
        VillagerRegistry.instance().registerVillageCreationHandler(new WorkshopCreationHandeler());
        try
        {
        	MapGenStructureIO.func_143031_a(ComponentWorkshop.class, "bcadditions:Workshop");
        }
        catch (Throwable e){}

VillagerTradeHandler.java

package buildcraftAdditions.villager;

import java.util.Random;

import net.minecraft.entity.passive.EntityVillager;
import net.minecraft.init.Blocks;
import net.minecraft.item.ItemStack;
import net.minecraft.village.MerchantRecipe;
import net.minecraft.village.MerchantRecipeList;
import cpw.mods.fml.common.registry.VillagerRegistry.IVillageTradeHandler;

public class VillagerTradeHandler implements IVillageTradeHandler {

    public void manipulateTradesForVillager(EntityVillager villager, MerchantRecipeList recipeList, Random random)
    {
    	//this is where the custom villager trades are specified
        recipeList.add(new MerchantRecipe(new ItemStack(Blocks.log, 8, 0), null, new ItemStack(Blocks.planks, 64, 0)));
    }

}

WorkshopCreationHandeler.java

package buildcraftAdditions.villager;

import java.util.List;
import java.util.Random;

import net.minecraft.world.gen.structure.StructureVillagePieces.PieceWeight;
import net.minecraft.world.gen.structure.StructureVillagePieces.Start;
import cpw.mods.fml.common.registry.VillagerRegistry.IVillageCreationHandler;

public class WorkshopCreationHandeler implements IVillageCreationHandler {

	@Override
	public PieceWeight getVillagePieceWeight(Random random, int i) {
		 return new PieceWeight(ComponentWorkshop.class, 9, 1);
	}

	@Override
	public Class<?> getComponentClass() {
		return ComponentWorkshop.class;
	}

	@Override
	public Object buildComponent(PieceWeight villagePiece, Start startPiece, List pieces, Random random, int p1, int p2, int p3, int p4, int p5) {
		 return ComponentWorkshop.buildComponent(startPiece, pieces, random, p1, p2, p3, p4, p5);
	}
    

}