From 11c697d7c55d8cd64c7d4f79a3ca39716b4ddccf Mon Sep 17 00:00:00 2001
From: Bjorn Misseghers <bjorn.misseghers@unifiedpost.com>
Date: Tue, 13 Apr 2021 08:50:16 +0200
Subject: [PATCH] Separate qyality behavior in separate class

Same reason as for the sellIn behavior. We want to be able to provide
separate implementations and test them separately
---
 .../quality/DefaultQualityBehavior.java       | 22 +++++++++++++++++++
 .../behavior/quality/QualityBehavior.java     |  8 +++++++
 2 files changed, 30 insertions(+)
 create mode 100644 Java/src/main/java/com/gildedrose/behavior/quality/DefaultQualityBehavior.java
 create mode 100644 Java/src/main/java/com/gildedrose/behavior/quality/QualityBehavior.java

diff --git a/Java/src/main/java/com/gildedrose/behavior/quality/DefaultQualityBehavior.java b/Java/src/main/java/com/gildedrose/behavior/quality/DefaultQualityBehavior.java
new file mode 100644
index 00000000..ffa72474
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/behavior/quality/DefaultQualityBehavior.java
@@ -0,0 +1,22 @@
+package com.gildedrose.behavior.quality;
+
+import com.gildedrose.Item;
+
+public class DefaultQualityBehavior implements QualityBehavior {
+
+    public static final int MAX_QUALITY_LEVEL = 50;
+    public static final int MIN_QUALITY_LEVEL = 0;
+
+    @Override
+    public void processQualityUpdate(Item item) {
+        decreaseQuality(item);
+    }
+
+    private void decreaseQuality(Item item) {
+        item.quality = limitQuality(item.quality - 1);
+    }
+
+    private int limitQuality(int newQuality) {
+        return Math.max(MIN_QUALITY_LEVEL, Math.min(MAX_QUALITY_LEVEL, newQuality));
+    }
+}
diff --git a/Java/src/main/java/com/gildedrose/behavior/quality/QualityBehavior.java b/Java/src/main/java/com/gildedrose/behavior/quality/QualityBehavior.java
new file mode 100644
index 00000000..60b8bc97
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/behavior/quality/QualityBehavior.java
@@ -0,0 +1,8 @@
+package com.gildedrose.behavior.quality;
+
+import com.gildedrose.Item;
+
+public interface QualityBehavior {
+
+    void processQualityUpdate(Item item);
+}