From 4cbd53aa8a111724c8763ff6693318363afeafe9 Mon Sep 17 00:00:00 2001
From: mperor <mpietryga93@gmail.com>
Date: Fri, 21 Feb 2025 15:37:39 +0100
Subject: [PATCH] Implement "wolf and sheep" task solution

---
 README.md                                     |  1 +
 .../interview/tasks/exception/Sheep.java      | 22 ++++++++++
 .../exception/SomethingExceptionallyGood.java |  8 ++++
 .../interview/tasks/exception/Wolf.java       | 21 ++++++++++
 .../exception/WolfFullAndSheepWholeTest.java  | 40 +++++++++++++++++++
 5 files changed, 92 insertions(+)
 create mode 100644 src/main/java/pl/mperor/interview/tasks/exception/Sheep.java
 create mode 100644 src/main/java/pl/mperor/interview/tasks/exception/SomethingExceptionallyGood.java
 create mode 100644 src/main/java/pl/mperor/interview/tasks/exception/Wolf.java
 create mode 100644 src/test/java/pl/mperor/interview/tasks/exception/WolfFullAndSheepWholeTest.java

diff --git a/README.md b/README.md
index d157365..718e0e7 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ are not the only possible solutions to these cases.
     * [String Challenges 🔡](src/test/java/pl/mperor/interview/tasks/challenge/StringChallengeTest.java)
     * [Number Challenges 🔢](src/test/java/pl/mperor/interview/tasks/challenge/NumberChallengeTest.java)
 7. [Quiz Questions ❔](src/test/java/pl/mperor/interview/tasks/QuizQuestionsTest.java)
+8. [Wolf 🐕 & Sheep 🐑](src/test/java/pl/mperor/interview/tasks/exception/WolfFullAndSheepWholeTest.java)
 
 ## Sources 🔗
 
diff --git a/src/main/java/pl/mperor/interview/tasks/exception/Sheep.java b/src/main/java/pl/mperor/interview/tasks/exception/Sheep.java
new file mode 100644
index 0000000..1ad4a1a
--- /dev/null
+++ b/src/main/java/pl/mperor/interview/tasks/exception/Sheep.java
@@ -0,0 +1,22 @@
+package pl.mperor.interview.tasks.exception;
+
+class Sheep {
+
+    private boolean alive = true;
+
+    boolean isAlive() {
+        return alive;
+    }
+
+    void setAlive(boolean alive) {
+        this.alive = alive;
+    }
+
+    /**
+     * No matter what the sheep says, the wolf will eat it anyway.
+     * Unless the sheep offers something exceptionally good :)
+     */
+    boolean doesWantToBeEaten() {
+        return false;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/pl/mperor/interview/tasks/exception/SomethingExceptionallyGood.java b/src/main/java/pl/mperor/interview/tasks/exception/SomethingExceptionallyGood.java
new file mode 100644
index 0000000..6e6db89
--- /dev/null
+++ b/src/main/java/pl/mperor/interview/tasks/exception/SomethingExceptionallyGood.java
@@ -0,0 +1,8 @@
+package pl.mperor.interview.tasks.exception;
+
+class SomethingExceptionallyGood extends RuntimeException {
+
+    SomethingExceptionallyGood(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/pl/mperor/interview/tasks/exception/Wolf.java b/src/main/java/pl/mperor/interview/tasks/exception/Wolf.java
new file mode 100644
index 0000000..eef62a3
--- /dev/null
+++ b/src/main/java/pl/mperor/interview/tasks/exception/Wolf.java
@@ -0,0 +1,21 @@
+package pl.mperor.interview.tasks.exception;
+
+class Wolf {
+
+    private boolean hunger = true;
+
+    boolean isHunger() {
+        return hunger;
+    }
+
+    void eat(Sheep sheep) {
+        sheep.setAlive(false);
+        hunger = false;
+        System.out.println("The wolf devoured the sheep 🐑!");
+    }
+
+    void eat(SomethingExceptionallyGood something) {
+        hunger = false;
+        System.out.printf("The wolf has eaten %s%n", something.getMessage());
+    }
+}
diff --git a/src/test/java/pl/mperor/interview/tasks/exception/WolfFullAndSheepWholeTest.java b/src/test/java/pl/mperor/interview/tasks/exception/WolfFullAndSheepWholeTest.java
new file mode 100644
index 0000000..5d931ba
--- /dev/null
+++ b/src/test/java/pl/mperor/interview/tasks/exception/WolfFullAndSheepWholeTest.java
@@ -0,0 +1,40 @@
+package pl.mperor.interview.tasks.exception;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class WolfFullAndSheepWholeTest {
+
+    @Test
+    public void shouldFeedWolfAndKeepSheepAlive() {
+        Wolf wolf = new Wolf();
+        Sheep sheep = new Sheep();
+        feedTheWolf(wolf, sheep, () -> {
+            // Todo: Try to save sheep!
+            throw new SomethingExceptionallyGood("candies 🍬");
+        });
+        Assertions.assertTrue(!wolf.isHunger() && sheep.isAlive(), "The wolf should not be hungry and the sheep alive!");
+    }
+
+    /**
+     * The wolf should eat the sheep. However, if we offer something exceptionally good,
+     * the wolf may choose to go for it instead.
+     * <p>
+     * Handle this exceptional situation appropriately.
+     * Do not modify the existing code.
+     */
+    private static void feedTheWolf(Wolf wolf, Sheep sheep, Runnable doSomethingToSaveSheep) {
+        try {
+            boolean willEatSheep = sheep.doesWantToBeEaten();
+            if (willEatSheep || !willEatSheep) { // actually, the sheep has no say
+                doSomethingToSaveSheep.run();
+                wolf.eat(sheep);
+            }
+        } catch (SomethingExceptionallyGood something) {
+            wolf.eat(something);
+        } finally {
+            assert !wolf.isHunger();
+        }
+    }
+
+}