Minecraft/src/main/java/com/microsoft/Malmo/MissionHandlers/AgentQuitFromSmeltingItemImplementation.java [100:151]:
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    public void onItemSmelt(PlayerEvent.ItemSmeltedEvent event) {
        if (event.player instanceof EntityPlayerMP && !event.smelting.isEmpty())
            checkForMatch(event.smelting);
    }

    /**
     * Checks whether the ItemStack matches a variant stored in the item list. If
     * so, returns true, else returns false.
     *
     * @param is The item stack
     * @return If the stack is allowed in the item matchers and has color or
     * variants enabled, returns true, else false.
     */
    private boolean getVariant(ItemStack is) {
        for (ItemMatcher matcher : matchers) {
            if (matcher.allowedItemTypes.contains(is.getItem().getUnlocalizedName())) {
                if (matcher.matchSpec.getColour() != null && matcher.matchSpec.getColour().size() > 0)
                    return true;
                if (matcher.matchSpec.getVariant() != null && matcher.matchSpec.getVariant().size() > 0)
                    return true;
            }
        }

        return false;
    }

    private int getSmeltedItemCount(ItemStack is) {
        boolean variant = getVariant(is);

        if (variant)
            return (smeltedItems.get(is.getUnlocalizedName()) == null) ? 0 : smeltedItems.get(is.getUnlocalizedName());
        else
            return (smeltedItems.get(is.getItem().getUnlocalizedName()) == null) ? 0
                    : smeltedItems.get(is.getItem().getUnlocalizedName());
    }

    private void addSmeltedItemCount(ItemStack is) {
        boolean variant = getVariant(is);

        if (variant) {
            int prev = (smeltedItems.get(is.getUnlocalizedName()) == null ? 0
                    : smeltedItems.get(is.getUnlocalizedName()));
            smeltedItems.put(is.getUnlocalizedName(), prev + is.getCount());
        } else {
            int prev = (smeltedItems.get(is.getItem().getUnlocalizedName()) == null ? 0
                    : smeltedItems.get(is.getItem().getUnlocalizedName()));
            smeltedItems.put(is.getItem().getUnlocalizedName(), prev + is.getCount());
        }
    }

    private void checkForMatch(ItemStack is) {
        int savedSmelted = getSmeltedItemCount(is);
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Minecraft/src/main/java/com/microsoft/Malmo/MissionHandlers/RewardForSmeltingItemImplementation.java [47:98]:
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    public void onItemSmelt(PlayerEvent.ItemSmeltedEvent event) {
        if (event.player instanceof EntityPlayerMP && !event.smelting.isEmpty())
            checkForMatch(event.smelting);
    }

    /**
     * Checks whether the ItemStack matches a variant stored in the item list. If
     * so, returns true, else returns false.
     *
     * @param is The item stack
     * @return If the stack is allowed in the item matchers and has color or
     * variants enabled, returns true, else false.
     */
    private boolean getVariant(ItemStack is) {
        for (ItemMatcher matcher : matchers) {
            if (matcher.allowedItemTypes.contains(is.getItem().getUnlocalizedName())) {
                if (matcher.matchSpec.getColour() != null && matcher.matchSpec.getColour().size() > 0)
                    return true;
                if (matcher.matchSpec.getVariant() != null && matcher.matchSpec.getVariant().size() > 0)
                    return true;
            }
        }

        return false;
    }

    private int getSmeltedItemCount(ItemStack is) {
        boolean variant = getVariant(is);

        if (variant)
            return (smeltedItems.get(is.getUnlocalizedName()) == null) ? 0 : smeltedItems.get(is.getUnlocalizedName());
        else
            return (smeltedItems.get(is.getItem().getUnlocalizedName()) == null) ? 0
                    : smeltedItems.get(is.getItem().getUnlocalizedName());
    }

    private void addSmeltedItemCount(ItemStack is) {
        boolean variant = getVariant(is);

        if (variant) {
            int prev = (smeltedItems.get(is.getUnlocalizedName()) == null ? 0
                    : smeltedItems.get(is.getUnlocalizedName()));
            smeltedItems.put(is.getUnlocalizedName(), prev + is.getCount());
        } else {
            int prev = (smeltedItems.get(is.getItem().getUnlocalizedName()) == null ? 0
                    : smeltedItems.get(is.getItem().getUnlocalizedName()));
            smeltedItems.put(is.getItem().getUnlocalizedName(), prev + is.getCount());
        }
    }

    private void checkForMatch(ItemStack is) {
        int savedSmelted = getSmeltedItemCount(is);
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