Adds unfinished code for storing arena rewards

src/main/java/net/knarcraft/minigames/arena/reward/PermissionReward.java

@@ -0,0 +1,73 @@
+package net.knarcraft.minigames.arena.reward;
+
+import net.knarcraft.minigames.config.Message;
+import net.knarcraft.minigames.container.PlaceholderContainer;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * A reward that grants a specified permission when granted
+ */
+public class PermissionReward implements Reward {
+
+    private final @NotNull String permission;
+    private final @Nullable World world;
+
+    /**
+     * Instantiates a new permission reward
+     *
+     * @param world      <p>The world to grant the permission for, or null</p>
+     * @param permission <p>The permission to grant</p>
+     */
+    public PermissionReward(@Nullable World world, @NotNull String permission) {
+        this.world = world;
+        this.permission = permission;
+    }
+
+    @Override
+    public boolean grant(@NotNull Player player) {
+        //TODO: Vault integration is required
+        return false;
+    }
+
+    @Override
+    public @NotNull String getGrantMessage() {
+        if (world == null) {
+            return Message.SUCCESS_PERMISSION_REWARDED.getMessage("{permission}", permission);
+        } else {
+            PlaceholderContainer placeholderContainer = new PlaceholderContainer();
+            placeholderContainer.add("{permission}", permission).add("{world}", world.getName());
+            return Message.SUCCESS_PERMISSION_REWARDED_WORLD.getMessage(placeholderContainer);
+        }
+    }
+
+    @NotNull
+    @Override
+    public Map<String, Object> serialize() {
+        Map<String, Object> data = new HashMap<>();
+        if (world != null) {
+            data.put("world", world);
+        }
+        data.put("permission", permission);
+        return data;
+    }
+
+    /**
+     * Deserializes the permission reward defined in the given data
+     *
+     * @param data <p>The data to deserialize from</p>
+     * @return <p>The deserialized data</p>
+     */
+    @SuppressWarnings("unused")
+    public static PermissionReward deserialize(Map<String, Object> data) {
+        World world = (World) data.getOrDefault("world", null);
+        String permission = (String) data.get("permission");
+        return new PermissionReward(world, permission);
+    }
+
+}