From fa0aa29a17896b28bff9b5d66d8ed8d02d141009 Mon Sep 17 00:00:00 2001
From: Erol Shaban <erol.shaban@ing.com>
Date: Wed, 21 Aug 2019 09:14:01 +0200
Subject: [PATCH] Template method initialized in order to update items
 respectively. Each item's quality and sellIn can be updated in a different
 manner

---
 .../java/com/gildedrose/AgedBrieUpdater.java  | 15 ++++++++
 .../com/gildedrose/BackstagePassUpdater.java  | 25 ++++++++++++
 .../java/com/gildedrose/ConjuredUpdater.java  | 17 +++++++++
 .../com/gildedrose/GildedRosePrototype.java   | 16 ++++++++
 .../main/java/com/gildedrose/ItemUpdater.java | 10 +++++
 .../com/gildedrose/ItemUpdaterFactory.java    | 38 +++++++++++++++++++
 .../com/gildedrose/StandardItemUpdater.java   | 16 ++++++++
 .../java/com/gildedrose/SulfurasUpdater.java  | 13 +++++++
 .../java/com/gildedrose/TexttestFixture.java  |  2 +
 9 files changed, 152 insertions(+)
 create mode 100644 Java/src/main/java/com/gildedrose/AgedBrieUpdater.java
 create mode 100644 Java/src/main/java/com/gildedrose/BackstagePassUpdater.java
 create mode 100644 Java/src/main/java/com/gildedrose/ConjuredUpdater.java
 create mode 100644 Java/src/main/java/com/gildedrose/GildedRosePrototype.java
 create mode 100644 Java/src/main/java/com/gildedrose/ItemUpdater.java
 create mode 100644 Java/src/main/java/com/gildedrose/ItemUpdaterFactory.java
 create mode 100644 Java/src/main/java/com/gildedrose/StandardItemUpdater.java
 create mode 100644 Java/src/main/java/com/gildedrose/SulfurasUpdater.java

diff --git a/Java/src/main/java/com/gildedrose/AgedBrieUpdater.java b/Java/src/main/java/com/gildedrose/AgedBrieUpdater.java
new file mode 100644
index 00000000..070c6690
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/AgedBrieUpdater.java
@@ -0,0 +1,15 @@
+package com.gildedrose;
+
+public class AgedBrieUpdater extends ItemUpdater {
+    @Override
+    void updateQuality(Item item) {
+        if (item.quality < 50) {
+            item.quality += 1;
+        }
+    }
+
+    @Override
+    void updateSellIn(Item item) {
+        item.sellIn -=1;
+    }
+}
diff --git a/Java/src/main/java/com/gildedrose/BackstagePassUpdater.java b/Java/src/main/java/com/gildedrose/BackstagePassUpdater.java
new file mode 100644
index 00000000..5bad8662
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/BackstagePassUpdater.java
@@ -0,0 +1,25 @@
+package com.gildedrose;
+
+public class BackstagePassUpdater extends ItemUpdater {
+    @Override
+    void updateQuality(Item item) {
+        if (item.sellIn < 0) {
+            item.quality = 0;
+        } else if (item.quality < 50) {
+            item.quality += 1;
+
+            if (item.sellIn < 11 && item.quality < 50) {
+                item.quality += 1;
+            }
+
+            if (item.sellIn < 6 && item.quality < 50) {
+                item.quality += 1;
+            }
+        }
+    }
+
+    @Override
+    void updateSellIn(Item item) {
+        item.sellIn -=1;
+    }
+}
diff --git a/Java/src/main/java/com/gildedrose/ConjuredUpdater.java b/Java/src/main/java/com/gildedrose/ConjuredUpdater.java
new file mode 100644
index 00000000..11562876
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/ConjuredUpdater.java
@@ -0,0 +1,17 @@
+package com.gildedrose;
+
+public class ConjuredUpdater extends ItemUpdater {
+    @Override
+    void updateQuality(Item item) {
+        if (item.quality > 0) {
+            item.quality -= 2;
+            if (item.quality < 0 )
+                item.quality =0;
+        }
+    }
+
+    @Override
+    void updateSellIn(Item item) {
+        item.sellIn -= 1;
+    }
+}
diff --git a/Java/src/main/java/com/gildedrose/GildedRosePrototype.java b/Java/src/main/java/com/gildedrose/GildedRosePrototype.java
new file mode 100644
index 00000000..4ed8cf7c
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/GildedRosePrototype.java
@@ -0,0 +1,16 @@
+package com.gildedrose;
+
+class GildedRosePrototype {
+    Item[] items;
+
+    public GildedRosePrototype(Item[] items) {
+        this.items = items;
+    }
+
+    public void updateQuality() {
+        for (Item item : items) {
+            ItemUpdaterFactory.getItemUpdater(item)
+                    .updateStateFor(item);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Java/src/main/java/com/gildedrose/ItemUpdater.java b/Java/src/main/java/com/gildedrose/ItemUpdater.java
new file mode 100644
index 00000000..8a7d1f35
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/ItemUpdater.java
@@ -0,0 +1,10 @@
+package com.gildedrose;
+
+public abstract class ItemUpdater {
+    public void updateStateFor(Item item){
+        updateSellIn(item);
+        updateQuality(item);
+    }
+    abstract void updateQuality(Item item);
+    abstract void updateSellIn(Item item);
+}
diff --git a/Java/src/main/java/com/gildedrose/ItemUpdaterFactory.java b/Java/src/main/java/com/gildedrose/ItemUpdaterFactory.java
new file mode 100644
index 00000000..a5ce349a
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/ItemUpdaterFactory.java
@@ -0,0 +1,38 @@
+package com.gildedrose;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+public class ItemUpdaterFactory {
+
+    private static final Map<String, ItemUpdater> registeredCustomUpdaters = new HashMap<>();
+    static {
+        registeredCustomUpdaters.put("Aged Brie", new AgedBrieUpdater());
+        registeredCustomUpdaters.put("Backstage passes to a TAFKAL80ETC concert", new BackstagePassUpdater());
+        registeredCustomUpdaters.put("Sulfuras, Hand of Ragnaros", new SulfurasUpdater());
+        registeredCustomUpdaters.put("Conjured", new ConjuredUpdater());
+    }
+
+    public static void registerCustomUpdater(String type, ItemUpdater updater ){
+        registeredCustomUpdaters.put(type, updater);
+    }
+
+    public static ItemUpdater getItemUpdater(Item item) {
+        return Optional.ofNullable(registeredCustomUpdaters.get(item.name))
+                .orElse(new StandardItemUpdater());
+    }
+
+    /*public static ItemUpdater getItemUpdater_(Item item) {
+        if ("Aged Brie".equals(item.name))
+            return new AgedBrieUpdater();
+        else if ("Backstage passes to a TAFKAL80ETC concert".equals(item.name))
+            return new BackstagePassUpdater();
+        else if ("Sulfuras, Hand of Ragnaros".equals(item.name))
+            return new SulfurasUpdater();
+        else if ("Conjured".equals(item.name))
+            return new ConjuredUpdater();
+        else
+            return new StandardItemUpdater();
+    }*/
+}
diff --git a/Java/src/main/java/com/gildedrose/StandardItemUpdater.java b/Java/src/main/java/com/gildedrose/StandardItemUpdater.java
new file mode 100644
index 00000000..1c3b586f
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/StandardItemUpdater.java
@@ -0,0 +1,16 @@
+package com.gildedrose;
+
+public class StandardItemUpdater extends ItemUpdater{
+
+    @Override
+    void updateQuality(Item item) {
+        if (item.quality > 0) {
+            item.quality  -= 1;
+        }
+    }
+
+    @Override
+    void updateSellIn(Item item) {
+        item.sellIn -= 1;
+    }
+}
diff --git a/Java/src/main/java/com/gildedrose/SulfurasUpdater.java b/Java/src/main/java/com/gildedrose/SulfurasUpdater.java
new file mode 100644
index 00000000..e6dfe122
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/SulfurasUpdater.java
@@ -0,0 +1,13 @@
+package com.gildedrose;
+
+public class SulfurasUpdater extends ItemUpdater {
+    @Override
+    void updateQuality(Item item) {
+        System.out.println("########Sulfuras is a legendary product");
+    }
+
+    @Override
+    void updateSellIn(Item item) {
+        System.out.println("########Never gets old");
+    }
+}
diff --git a/Java/src/test/java/com/gildedrose/TexttestFixture.java b/Java/src/test/java/com/gildedrose/TexttestFixture.java
index d059c88f..6baf8ddc 100644
--- a/Java/src/test/java/com/gildedrose/TexttestFixture.java
+++ b/Java/src/test/java/com/gildedrose/TexttestFixture.java
@@ -13,6 +13,8 @@ public class TexttestFixture {
                 new Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
                 new Item("Backstage passes to a TAFKAL80ETC concert", 10, 49),
                 new Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+                new Item("Backstage passes to a TAFKAL80ETC concert", 1, 30),
+                new Item("Backstage passes to a TAFKAL80ETC concert", 0, 30),
                 // this conjured item does not work properly yet
                 new Item("Conjured Mana Cake", 3, 6) };