Example.java

public class Flardians {

    public static final ItemType[] SELL_TYPES = new ItemType[] {ItemTypes.SLIME_BALL, ItemTypes.HARDENED_CLAY, ItemTypes.BLAZE_ROD, ItemTypes.APPLE,
                                                                ItemTypes.GHAST_TEAR, ItemTypes.COBBLESTONE, ItemTypes.STICK, ItemTypes.EMERALD,};
    public static final List<ItemType> BUYING_TYPES = ImmutableList.of(ItemTypes.ACACIA_DOOR, ItemTypes.LEAVES2, ItemTypes.BOOKSHELF, ItemTypes.COAL,
                                                                      ItemTypes.COBBLESTONE, ItemTypes.ANVIL, ItemTypes.IRON_ORE, ItemTypes.APPLE,
                                                                      ItemTypes.WHEAT_SEEDS, ItemTypes.DIRT);
    public static final Text FLARDARIAN = Texts.of(TextColors.DARK_AQUA, TextStyles.BOLD, TextStyles.ITALIC, "Flardarian");
    public static final Text ITEM_DISPLAY = Texts.of(TextColors.YELLOW, TextStyles.BOLD, "[", TextColors.GREEN, TextStyles.ITALIC, "FLARD",
                                                     TextStyles.RESET, TextColors.YELLOW, TextStyles.BOLD, "]");
    public static final Text LORE_FIRST = Texts.of(TextColors.BLUE, TextStyles.ITALIC, "This is indeed a glorious day!");
    public static final Text LORE_SECOND = Texts.of(TextColors.BLUE, TextStyles.ITALIC, "Shining sun makes the clouds flee");
    public static final Text LORE_THIRD = Texts.of(TextColors.BLUE, TextStyles.ITALIC, "With State of ", TextColors.YELLOW, "Sponge",
                                                   TextColors.BLUE, " again today");
    public static final Text LORE_FOURTH = Texts.of(TextColors.BLUE, TextStyles.ITALIC, "Granting delights for you and me");
    public static final Text LORE_FIFTH = Texts.of(TextColors.BLUE, TextStyles.ITALIC, "For ", TextColors.YELLOW, "Sponge", TextColors.BLUE,
                                                   " is in a State of play");
    public static final Text LORE_SIXTH = Texts.of(TextColors.BLUE, TextStyles.ITALIC, "Today, be happy as can be!");
    public static final Random RANDOM = new Random();

    @Inject private Game game;


    @Subscribe
    public void onSpawn(EntitySpawnEvent event) {
        if (event.getEntity().getType() == EntityTypes.VILLAGER && Math.random() > 0.7) {
            final Villager entity = (Villager) event.getEntity();
            entity.setCareer(Careers.CLERIC);
            entity.setDisplayName(FLARDARIAN);
            entity.setShowsDisplayName(true);
            entity.setInvulnerability(10000D);
            entity.setTradeOffer(generateTradeOffer());
        }
    }

    private TradeOffer generateTradeOffer() {
        final int rand = RANDOM.nextInt(7);
        final int itemRand = RANDOM.nextInt(BUYING_TYPES.size());

        // Set up the lore data.
        final List<Text> lore = new List();
        lore.addAll(ImmutableList.of(LORE_FIRST, LORE_SECOND, LORE_THIRD, LORE_FOURTH, LORE_FIFTH, LORE_SIXTH));

        // Create the selling item
        final ItemStack selling = game.getRegistry().getItemBuilder()
            .itemType(BUYING_TYPES.get(itemRand))
            .setItemName(ITEM_DISPLAY)
            .setLore(lore)
            .quantity(1)
            .build();

        // Create the buying item
        final ItemStack buying = game.getRegistry().getItemBuilder()
            .itemType(SELL_TYPES[rand])
            .quantity(1)
            .build();

        final TradeOfferBuilder builder = game.getRegistry().getTradeOfferBuilder();
        return builder.firstBuyingItem(buying).maxUses(10000).sellingItem(selling).build());
    }

}