CleanCode-GildedRoseKata/Inventory.java

public class Inventory {
    private Item[] items;

    public Inventory(Item[] items) {
        super();
        this.items = items;
    }

    public void updateQuality() {
        for (int i = 0; i < items.length; i++) {
            if(!items[i].getName().equals("Sulfuras, Hand of Ragnaros")){
                if (items[i].getName().equals("Aged Brie")
                || items[i].getName().equals("Backstage passes to a TAFKAL80ETC concert")) {
                    //level 2 - quality
                    if (items[i].getQuality() < 50) {
                        increaseQualityBy1(items[i]);
                        //level 3 - item type
                        if (items[i].getName() == "Backstage passes to a TAFKAL80ETC concert") {
                            //level 4 - sell in date
                            if (items[i].getSellIn() < 11) {
                                //level 5 - quality
                                if (items[i].getQuality() < 50) {
                                    increaseQualityBy1(items[i]);
                                }
                            }
                            //level 4 - sell in date
                            if (items[i].getSellIn() < 6) {
                                //level 5 - quality
                                if (items[i].getQuality() < 50) {
                                    increaseQualityBy1(items[i]);
                                }
                            }
                        }
                    }
                    //level 1 - item type
                } else if (items[i].getQuality() > 0) {
                    reduceQualityBy1(items[i]);
                }

                updateSellInDays(items[i]);
                if (items[i].getSellIn() < 0) {
                    updateExpiredItems(items[i]);
                }
            }
        }
    }

    public void reduceQualityBy1(Item item){
        item.setQuality(item.getQuality() -1);
    }

    public void increaseQualityBy1(Item item){
        item.setQuality(item.getQuality() + 1);
    }

    public void setQualityTo0(Item item){
        item.setQuality(item.getQuality() - item.getQuality());
    }

    public void updateSellInDays(Item item){
        item.setSellIn(item.getSellIn() - 1);
    }

    public void updateExpiredItems(Item item){
        if (item.getName().equals("Aged Brie") && item.getQuality() < 50) {
            increaseQualityBy1(item);
        } else if (item.getName().equals("Backstage passes to a TAFKAL80ETC concert")){
            setQualityTo0(item);
        } else if (item.getQuality() > 0) {
            reduceQualityBy1(item);
        }
    }
}