Adds item storage and more NPC behavior

Makes NPC look for and pick up items of specified types.
Adds a Backpack and IContainer interface.
Lets items use separate sounds. Not completed.

src/inf101/v18/rogue101/items/Backpack.java

@@ -0,0 +1,129 @@
+package inf101.v18.rogue101.items;
+
+import inf101.v18.rogue101.game.IGame;
+import inf101.v18.rogue101.objects.IItem;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Backpack<T extends IItem> implements IContainer {
+    /**
+     * A list containing everything in the backpack.
+     */
+    private List<T> content = new ArrayList<>();
+    /**
+     * The maximum amount of items allowed in a single backpack.
+     */
+    private final int MAX_SIZE = 5;
+
+    @Override
+    public int getCurrentHealth() {
+        return 0;
+    }
+
+    @Override
+    public int getDefence() {
+        return 0;
+    }
+
+    @Override
+    public int getMaxHealth() {
+        return 0;
+    }
+
+    @Override
+    public String getName() {
+        return "Backpack";
+    }
+
+    @Override
+    public int getSize() {
+        return 20;
+    }
+
+    @Override
+    public String getSymbol() {
+        return "B";
+    }
+
+    @Override
+    public int handleDamage(IGame game, IItem source, int amount) {
+        return 0;
+    }
+
+    /**
+     * Retrieves the current size of the Backpack.
+     *
+     * @return
+     */
+    public int size() {
+        return content.size();
+    }
+
+    /**
+     * Checks if the Backpack is empty
+     *
+     * @return  True if empty. False otherwise
+     */
+    public boolean isEmpty() {
+        return content.isEmpty();
+    }
+
+    /**
+     * Tries to add an item to the Backpack
+     *
+     * @param item  The item to add
+     * @return
+     */
+    public boolean add(T item) {
+        if (content.size() < MAX_SIZE) {
+            content.add(item);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Removes an element at index i
+     *
+     * @param i The index of an element
+     */
+    public void remove(int i) {
+        content.remove(i);
+    }
+
+    /**
+     * Gets a T at index i,
+     *
+     * @param i The index of an element
+     * @return  An object of type T
+     */
+    public T get(int i) {
+        return content.get(i);
+    }
+
+    /**
+     * Gets the content List for direct manipulation.
+     *
+     * @return  A list of T
+     */
+    public List<T> getContent() {
+        return content;
+    }
+
+    @Override
+    public boolean isFull() {
+        if (content.size() >= MAX_SIZE) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    //This shows as an error, but is necessary to compile.
+    @Override
+    public int compareTo(Object o) {
+        return compareTo((IItem)o);
+    }
+}

src/inf101/v18/rogue101/items/IBuffItem.java

@@ -2,7 +2,7 @@ package inf101.v18.rogue101.items;
 
 import inf101.v18.rogue101.objects.IItem;
 
-interface IBuffItem extends IItem {
+public interface IBuffItem extends IItem {
     /**
      * Retrieve damage increase done by the buff item.
      *

src/inf101/v18/rogue101/items/IContainer.java

@@ -0,0 +1,38 @@
+package inf101.v18.rogue101.items;
+
+import inf101.v18.rogue101.objects.IItem;
+
+import java.util.List;
+
+/**
+ * A container for storing anything extending IItem.
+ *
+ * @param <T>   The item type to store
+ */
+public interface IContainer<T extends IItem> extends IItem {
+    /**
+     * Retrieves an item from a container in index i
+     *
+     * @param i The index of an element
+     * @return  An IItem
+     * @throws  IndexOutOfBoundsException If the index is out of range.
+     */
+    IItem get(int i);
+
+    /**
+     * Gets a list with everything inside a container.
+     *
+     * @return  A list of Objects extending IItem
+     */
+    List<T> getContent();
+
+    /**
+     * Checks if we can add anything at all to the container.
+     *
+     * @return  True if it has no space left
+     */
+    boolean isFull();
+
+
+
+}

src/inf101/v18/rogue101/items/IMagicWeapon.java

@@ -1,12 +1,12 @@
 package inf101.v18.rogue101.items;
 
-import inf101.v18.rogue101.objects.IItem;
+/**
+ * An interface to extinguish different weapons for specific NPC.
+ */
+public interface IMagicWeapon extends IWeapon {
 
-interface IMagicWeapon extends IItem {
-    /**
-     * Retrieves the damage points of a weapon.
-     *
-     * @return
-     */
-    int getWeaponDamage();
+    @Override
+    default String getSound() {
+        return "audio/Bow_Fire_Arrow-Stephan_Schutze-2133929391.wav";
+    }
 }

src/inf101/v18/rogue101/items/IMeleeWeapon.java

@@ -1,12 +1,12 @@
 package inf101.v18.rogue101.items;
 
-import inf101.v18.rogue101.objects.IItem;
+/**
+ * An interface to extinguish different weapons for specific NPC.
+ */
+public interface IMeleeWeapon extends IWeapon {
 
-interface IMeleeWeapon extends IItem {
-    /**
-     * Retrieves the damage points of a weapon.
-     *
-     * @return
-     */
-    int getWeaponDamage();
+    @Override
+    default String getSound() {
+        return "audio/Sword Swing-SoundBible.com-639083727.wav";
+    }
 }

src/inf101/v18/rogue101/items/IRangedWeapon.java

@@ -1,12 +1,12 @@
 package inf101.v18.rogue101.items;
 
-import inf101.v18.rogue101.objects.IItem;
+/**
+ * An interface to extinguish different weapons for specific NPC.
+ */
+public interface IRangedWeapon extends IWeapon {
 
-interface IRangedWeapon extends IItem {
-    /**
-     * Retrieves the damage points of a weapon.
-     *
-     * @return
-     */
-    int getWeaponDamage();
+    @Override
+    default String getSound() {
+        return "audio/Bow_Fire_Arrow-Stephan_Schutze-2133929391.wav";
+    }
 }

src/inf101/v18/rogue101/items/IWeapon.java

@@ -0,0 +1,19 @@
+package inf101.v18.rogue101.items;
+
+import inf101.v18.rogue101.objects.IItem;
+
+public interface IWeapon extends IItem {
+    /**
+     * Retrieves the damage points of a weapon.
+     *
+     * @return
+     */
+    int getWeaponDamage();
+
+    /**
+     * Retrieves the string path of the sound to play upon an attack.
+     *
+     * @return  A string path
+     */
+    String getSound();
+}