QualityRule interface, initial backstage pass rule

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

@@ -1,7 +1,10 @@
 package com.gildedrose;
 
 import com.gildedrose.rules.AgedBrieQualityRule;
+import com.gildedrose.rules.BackstagePassQualityRule;
+import com.gildedrose.rules.DefaultQualityRule;
 import com.gildedrose.rules.QualityRule;
+import com.gildedrose.rules.Result;
 import com.gildedrose.rules.SulfurasQualityRule;
 import lombok.val;
 
@@ -13,7 +16,8 @@ class GildedRose {
     private final List<QualityRule> rules = List.of(
             new SulfurasQualityRule(),
             new AgedBrieQualityRule(),
-            new QualityRule()
+            new BackstagePassQualityRule(),
+            new DefaultQualityRule()
     );
 
     public GildedRose(Item[] items) {
@@ -29,13 +33,15 @@ class GildedRose {
 
     private void processItem(final Item item) {
 
+        val newSellIn = calculateSellIn(item.name, item.sellIn);
+
         var newQuality = rules.stream()
-                .reduce(new QualityRule.Result(item.quality, false),
+                .reduce(new Result(item.quality, false),
                         (q, rule) -> {
                             if (q.isFinalValue() || !rule.shouldApply(item.name)) {
                                 return q;
                             } else {
-                                return rule.calculateQuality(q.getQuality());
+                                return rule.calculateQuality(q.getQuality(), newSellIn);
                             }
                         },
                         (a, b) -> b).getQuality();
@@ -69,7 +75,7 @@ class GildedRose {
         }
 */
 
-        val newSellIn = calculateSellIn(item.name, item.sellIn);
+
 
 /*        if (newSellIn < 0) {
             if (!item.name.equals("Aged Brie")) {

Java/src/main/java/com/gildedrose/rules/AgedBrieQualityRule.java

@@ -2,7 +2,7 @@ package com.gildedrose.rules;
 
 import static java.lang.Integer.min;
 
-public class AgedBrieQualityRule extends QualityRule {
+public class AgedBrieQualityRule implements QualityRule {
 
     @Override
     public boolean shouldApply(String itemName) {
@@ -10,7 +10,7 @@ public class AgedBrieQualityRule extends QualityRule {
     }
 
     @Override
-    public Result calculateQuality(int oldQuality) {
+    public Result calculateQuality(int oldQuality, int sellIn) {
         return new Result(min(oldQuality + 1, 50), true);
     }
 }

Java/src/main/java/com/gildedrose/rules/BackstagePassQualityRule.java

@@ -0,0 +1,17 @@
+package com.gildedrose.rules;
+
+import static java.lang.Integer.min;
+
+public class BackstagePassQualityRule implements QualityRule {
+
+    @Override
+    public boolean shouldApply(String itemName) {
+        return "Backstage passes to a TAFKAL80ETC concert".equals(itemName);
+    }
+
+    @Override
+    public Result calculateQuality(int oldQuality, int sellIn) {
+        final int newQuality = oldQuality + 2;
+        return new Result(min(newQuality, 50), true);
+    }
+}

Java/src/main/java/com/gildedrose/rules/DefaultQualityRule.java

@@ -0,0 +1,17 @@
+package com.gildedrose.rules;
+
+import static java.lang.Integer.max;
+
+public class DefaultQualityRule implements QualityRule {
+
+    @Override
+    public boolean shouldApply(String itemName) {
+        return true;
+    }
+
+    @Override
+    public Result calculateQuality(int oldQuality, int sellIn) {
+        return new Result(max(oldQuality - 1, 0), false);
+    }
+
+}

Java/src/main/java/com/gildedrose/rules/QualityRule.java

@@ -1,32 +1,7 @@
 package com.gildedrose.rules;
 
-import static java.lang.Integer.max;
+public interface QualityRule {
+    boolean shouldApply(String itemName);
 
-public class QualityRule {
+    Result calculateQuality(int oldQuality, int sellIn);
-
-    public boolean shouldApply(String itemName) {
-        return true;
-    }
-
-    public Result calculateQuality(int oldQuality) {
-        return new Result(max(oldQuality - 1, 0), false);
-    }
-
-    public static class Result {
-        final int quality;
-        final boolean isFinalValue;
-
-        public Result(int quality, boolean isFinalValue) {
-            this.quality = quality;
-            this.isFinalValue = isFinalValue;
-        }
-
-        public int getQuality() {
-            return quality;
-        }
-
-        public boolean isFinalValue() {
-            return isFinalValue;
-        }
-    }
 }

Java/src/main/java/com/gildedrose/rules/Result.java

@@ -0,0 +1,19 @@
+package com.gildedrose.rules;
+
+public class Result {
+    final int quality;
+    final boolean isFinalValue;
+
+    public Result(int quality, boolean isFinalValue) {
+        this.quality = quality;
+        this.isFinalValue = isFinalValue;
+    }
+
+    public int getQuality() {
+        return quality;
+    }
+
+    public boolean isFinalValue() {
+        return isFinalValue;
+    }
+}

Java/src/main/java/com/gildedrose/rules/SulfurasQualityRule.java

@@ -1,6 +1,6 @@
 package com.gildedrose.rules;
 
-public class SulfurasQualityRule extends QualityRule {
+public class SulfurasQualityRule implements QualityRule {
 
     @Override
     public boolean shouldApply(String itemName) {
@@ -8,7 +8,7 @@ public class SulfurasQualityRule extends QualityRule {
     }
 
     @Override
-    public Result calculateQuality(int oldQuality) {
+    public Result calculateQuality(int oldQuality, int sellIn) {
         return new Result(oldQuality, true);
     }
 }