From f218bf5fa6f47b00800d068097b3b75c86fa1e39 Mon Sep 17 00:00:00 2001
From: Benoît LUBRANO DI SBARAGLIONE
Date: Tue, 11 Mar 2014 09:47:27 +0100
Subject: Add back command

---
 src/esieequest/controller/Interpreter.java |  3 +++
 src/esieequest/controller/Performer.java   |  8 ++++++++
 src/esieequest/model/Game.java             | 21 ++++++++++++++++-----
 3 files changed, 27 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/esieequest/controller/Interpreter.java b/src/esieequest/controller/Interpreter.java
index 5c60c0b..586b329 100644
--- a/src/esieequest/controller/Interpreter.java
+++ b/src/esieequest/controller/Interpreter.java
@@ -63,6 +63,9 @@ class Interpreter {
 			case "go":
 				this.performer.goTo(command.getOption());
 				return;
+			case "back":
+				this.performer.goBack();
+				return;
 			case "look":
 				this.performer.look();
 				return;
diff --git a/src/esieequest/controller/Performer.java b/src/esieequest/controller/Performer.java
index 6da3901..0ac194f 100644
--- a/src/esieequest/controller/Performer.java
+++ b/src/esieequest/controller/Performer.java
@@ -108,6 +108,14 @@ class Performer {
 		}
 	}
 
+	/**
+	 * Changes the current room to the previous one.
+	 */
+	public void goBack() {
+		this.game.goToPreviousRoom();
+		this.echo(this.game.getLocationInfo());
+	}
+
 	/**
 	 * Displays informations about the current place.
 	 */
diff --git a/src/esieequest/model/Game.java b/src/esieequest/model/Game.java
index 99afa7c..5f2049c 100644
--- a/src/esieequest/model/Game.java
+++ b/src/esieequest/model/Game.java
@@ -1,6 +1,7 @@
 package esieequest.model;
 
 import java.util.HashMap;
+import java.util.Stack;
 
 /**
  * Represents the game.
@@ -12,6 +13,7 @@ public class Game {
 
 	private final HashMap<String, Room> rooms;
 	private Room currentRoom;
+	private Stack<Room> previousRooms;
 
 	/**
 	 * The default constructor.
@@ -19,6 +21,7 @@ public class Game {
 	public Game() {
 		this.rooms = new HashMap<String, Room>();
 		this.currentRoom = null;
+		this.previousRooms = new Stack<Room>();
 
 		this.createRooms();
 		this.linkRooms();
@@ -48,8 +51,7 @@ public class Game {
 	 * @param exitRoomName
 	 *            the name of the exit room
 	 */
-	private void setRoomExit(final String roomName, final String direction,
-			final String exitRoomName) {
+	private void setRoomExit(final String roomName, final String direction, final String exitRoomName) {
 		this.rooms.get(roomName).addExit(direction, this.rooms.get(exitRoomName));
 	}
 
@@ -98,8 +100,7 @@ public class Game {
 		this.createRoom("OffscriptLock", "somewhere implementing a doorlock");
 		this.createRoom("OffscriptLockLockedroom", "in a locked room that is not anymore");
 		this.createRoom("OffscriptAlea", "somewhere implementing alea");
-		this.createRoom("OffscriptAleaRoomrandomizer",
-				"in a weird room that will transport you somewhere else");
+		this.createRoom("OffscriptAleaRoomrandomizer", "in a weird room that will transport you somewhere else");
 		this.createRoom("OffscriptMovingcharacter", "somewhere implementing a moving character");
 		this.createRoom("OffscriptMovingcharacterMo", "in M-O's room");
 
@@ -199,12 +200,13 @@ public class Game {
 	}
 
 	/**
-	 * Sets the current room.
+	 * Sets the current room and stacks previous rooms.
 	 * 
 	 * @param room
 	 *            the destination room
 	 */
 	public void goToRoom(final Room room) {
+		this.previousRooms.push(this.currentRoom);
 		this.currentRoom = room;
 	}
 
@@ -218,6 +220,15 @@ public class Game {
 		this.currentRoom = this.rooms.get(roomName);
 	}
 
+	/**
+	 * Sets the current room to the previous room.
+	 */
+	public void goToPreviousRoom() {
+		if (!this.previousRooms.empty()) {
+			this.currentRoom = this.previousRooms.pop();
+		}
+	}
+
 	/**
 	 * Returns the current room's exit located in the given direction.
 	 * 
-- 
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