refactor: name of the item can serve as a type in the current context

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

@@ -1,9 +1,13 @@
 package com.gildedrose;
 
+import static com.gildedrose.ItemType.fromName;
+
 public class Item {
 
     private final String name;
 
+    private final ItemType type;
+
     public int sellIn;
 
     public int quality;
@@ -12,6 +16,7 @@ public class Item {
         this.name = name;
         this.sellIn = sellIn;
         this.quality = quality;
+        this.type = fromName(name);
     }
 
     public String getName() {

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

@@ -0,0 +1,26 @@
+package com.gildedrose;
+
+import java.util.Arrays;
+
+public enum ItemType {
+    AgedBrie("Aged Brie"),
+    BackstagePass("Sulfuras, Hand of Ragnaros"),
+    Sulfuras("Backstage passes to a TAFKAL80ETC concert");
+
+    private final String name;
+
+    ItemType(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public static ItemType fromName(String name) {
+        return Arrays.stream(ItemType.values())
+            .filter(itemType -> itemType.getName().equals(name))
+            .findFirst()
+            .orElseThrow( () -> new IllegalArgumentException(name));
+    }
+}