refactorings

Java/src/main/java/com/gildedrose/GildedRose.java

@@ -1,62 +1,43 @@
 package com.gildedrose;
 
+import com.gildedrose.item.Item;
+import com.gildedrose.item.ItemFactory;
+
 class GildedRose {
+
+    private static final int LOWEST_QUALITY_LEVEL_POSSIBLE = 0;
+    private static final int HIGHEST_QUALITY_LEVEL_POSSIBLE = 50;
+    private final ItemFactory itemFactory;
     Item[] items;
 
     public GildedRose(Item[] items) {
+        this.itemFactory = new ItemFactory();
         this.items = items;
     }
 
     public void updateQuality() {
-        for (int i = 0; i < items.length; i++) {
-            if (!items[i].name.equals("Aged Brie")
-                    && !items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
-                if (items[i].quality > 0) {
-                    if (!items[i].name.equals("Sulfuras, Hand of Ragnaros")) {
-                        items[i].quality = items[i].quality - 1;
-                    }
-                }
-            } else {
-                if (items[i].quality < 50) {
-                    items[i].quality = items[i].quality + 1;
-
-                    if (items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
-                        if (items[i].sellIn < 11) {
-                            if (items[i].quality < 50) {
-                                items[i].quality = items[i].quality + 1;
-                            }
-                        }
-
-                        if (items[i].sellIn < 6) {
-                            if (items[i].quality < 50) {
-                                items[i].quality = items[i].quality + 1;
-                            }
-                        }
-                    }
-                }
-            }
-
-            if (!items[i].name.equals("Sulfuras, Hand of Ragnaros")) {
-                items[i].sellIn = items[i].sellIn - 1;
-            }
-
-            if (items[i].sellIn < 0) {
-                if (!items[i].name.equals("Aged Brie")) {
-                    if (!items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
-                        if (items[i].quality > 0) {
-                            if (!items[i].name.equals("Sulfuras, Hand of Ragnaros")) {
-                                items[i].quality = items[i].quality - 1;
-                            }
-                        }
-                    } else {
-                        items[i].quality = items[i].quality - items[i].quality;
-                    }
-                } else {
-                    if (items[i].quality < 50) {
-                        items[i].quality = items[i].quality + 1;
-                    }
-                }
+        customizeItems();
+        for (Item item : items) {
+            item.updateYourState();
+            if (hasReachedLowestQualityLimit(item.quality)) {
+                item.quality = LOWEST_QUALITY_LEVEL_POSSIBLE;
+            } else if (hasReachedHighestQualityLimit(item.quality)) {
+                item.quality = HIGHEST_QUALITY_LEVEL_POSSIBLE;
             }
         }
     }
+
+    private void customizeItems() {
+        for (Item item : items) {
+            items = new Item[]{itemFactory.createItem(item.name, item.sellIn, item.quality)};
+        }
+    }
+
+    private boolean hasReachedLowestQualityLimit(int itemQuality) {
+        return itemQuality < LOWEST_QUALITY_LEVEL_POSSIBLE;
+    }
+
+    private boolean hasReachedHighestQualityLimit(int itemQuality) {
+        return itemQuality > HIGHEST_QUALITY_LEVEL_POSSIBLE;
+    }
 }

Java/src/main/java/com/gildedrose/item/AgedBrie.java

@@ -0,0 +1,13 @@
+package com.gildedrose.item;
+
+public class AgedBrie extends Item {
+
+    public AgedBrie(String name, int sellIn, int quality) {
+        super(name, sellIn, quality);
+    }
+
+    public void updateYourState() {
+        sellIn -= 1;
+        quality += 1;
+    }
+}

Java/src/main/java/com/gildedrose/item/BackstagePassesItem.java

@@ -0,0 +1,21 @@
+package com.gildedrose.item;
+
+public class BackstagePassesItem extends Item {
+
+    public BackstagePassesItem(String name, int sellIn, int quality) {
+        super(name, sellIn, quality);
+    }
+
+    public void updateYourState() {
+        sellIn -= 1;
+        if (sellIn >= 11) {
+            quality += 1;
+        } else if (sellIn > 5) {
+            quality += 2;
+        } else if (sellIn > 0) {
+            quality += 3;
+        } else {
+            quality = 0;
+        }
+    }
+}

Java/src/main/java/com/gildedrose/item/Item.java

@@ -1,4 +1,4 @@
-package com.gildedrose;
+package com.gildedrose.item;
 
 public class Item {
 
@@ -14,8 +14,11 @@ public class Item {
         this.quality = quality;
     }
 
-   @Override
-   public String toString() {
+    @Override
+    public String toString() {
         return this.name + ", " + this.sellIn + ", " + this.quality;
     }
+
+    public void updateYourState() {
+    }
 }

Java/src/main/java/com/gildedrose/item/ItemFactory.java

@@ -0,0 +1,16 @@
+package com.gildedrose.item;
+
+public class ItemFactory {
+
+    public Item createItem(String itemName, int sellIn, int quality) {
+        if (itemName.equals("Sulfuras, Hand of Ragnaros")) {
+            return new Sulfuras(itemName, sellIn, quality);
+        } else if (itemName.equals("Aged Brie")) {
+            return new AgedBrie(itemName, sellIn, quality);
+        } else if (itemName.equals("Backstage passes to a TAFKAL80ETC concert")) {
+            return new BackstagePassesItem(itemName, sellIn, quality);
+        } else {
+            return new StandardItem(itemName, sellIn, quality);
+        }
+    }
+}

Java/src/main/java/com/gildedrose/item/StandardItem.java

@@ -0,0 +1,17 @@
+package com.gildedrose.item;
+
+public class StandardItem extends Item {
+
+    public StandardItem(String name, int sellIn, int quality) {
+        super(name, sellIn, quality);
+    }
+
+    public void updateYourState() {
+        sellIn -= 1;
+        if (sellIn > 0) {
+            quality -= 1;
+        } else {
+            quality -= 2;
+        }
+    }
+}

Java/src/main/java/com/gildedrose/item/Sulfuras.java

@@ -0,0 +1,11 @@
+package com.gildedrose.item;
+
+public class Sulfuras extends Item {
+
+    public Sulfuras(String name, int sellIn, int quality) {
+        super(name, sellIn, quality);
+    }
+
+    public void updateYourState() {
+    }
+}

Java/src/test/java/com/gildedrose/TexttestFixture.java

@@ -1,5 +1,7 @@
 package com.gildedrose;
 
+import com.gildedrose.item.Item;
+
 public class TexttestFixture {
     public static void main(String[] args) {
         System.out.println("OMGHAI!");