From 5f51644a8c97250657f5b1b36f4aa8856ea70c6c Mon Sep 17 00:00:00 2001
From: Bjorn Misseghers <bjorn.misseghers@unifiedpost.com>
Date: Tue, 13 Apr 2021 08:47:35 +0200
Subject: [PATCH] Separate sellIn behavior in separate class

We extract this behavior in a separate interface so we can implement
different implementations of it and test them separately.
Default behavior is to decrease the sellIn date every iteration by 1
---
 .../behavior/sellin/DefaultSellInBehavior.java    | 15 +++++++++++++++
 .../behavior/sellin/SellInBehavior.java           |  8 ++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 Java/src/main/java/com/gildedrose/behavior/sellin/DefaultSellInBehavior.java
 create mode 100644 Java/src/main/java/com/gildedrose/behavior/sellin/SellInBehavior.java

diff --git a/Java/src/main/java/com/gildedrose/behavior/sellin/DefaultSellInBehavior.java b/Java/src/main/java/com/gildedrose/behavior/sellin/DefaultSellInBehavior.java
new file mode 100644
index 00000000..6f7c9f04
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/behavior/sellin/DefaultSellInBehavior.java
@@ -0,0 +1,15 @@
+package com.gildedrose.behavior.sellin;
+
+import com.gildedrose.Item;
+
+public class DefaultSellInBehavior implements SellInBehavior {
+
+    @Override
+    public void processSellInUpdate(Item item) {
+        decreaseSellIn(item);
+    }
+
+    private void decreaseSellIn(Item item) {
+        item.sellIn = item.sellIn - 1;
+    }
+}
diff --git a/Java/src/main/java/com/gildedrose/behavior/sellin/SellInBehavior.java b/Java/src/main/java/com/gildedrose/behavior/sellin/SellInBehavior.java
new file mode 100644
index 00000000..a092f5e5
--- /dev/null
+++ b/Java/src/main/java/com/gildedrose/behavior/sellin/SellInBehavior.java
@@ -0,0 +1,8 @@
+package com.gildedrose.behavior.sellin;
+
+import com.gildedrose.Item;
+
+public interface SellInBehavior {
+
+    void processSellInUpdate(Item item);
+}