Add economic entity interfaces

I decided to add these interfaces, instead of just building upon the User & UserData interface, as support for commerce between clans & users might be something that we want to add in the future in Clans.

Datura/src/main/java/me/totalfreedom/datura/user/SimpleUserData.java

@@ -26,6 +26,7 @@ public class SimpleUserData implements UserData
     private boolean frozen;
     private boolean canInteract;
     private boolean caged;
+    private long balance;
 
     public SimpleUserData(final Player player)
     {
@@ -42,7 +43,8 @@ public class SimpleUserData implements UserData
             final long playtime,
             final boolean frozen,
             final boolean canInteract,
-            final boolean caged)
+            final boolean caged,
+            final long balance)
     {
         this.uuid = uuid;
         this.username = username;
@@ -52,6 +54,7 @@ public class SimpleUserData implements UserData
         this.frozen = frozen;
         this.canInteract = canInteract;
         this.caged = caged;
+        this.balance = balance;
     }
 
     public static SimpleUserData fromSQL(SQL sql, String uuid)
@@ -82,7 +85,8 @@ public class SimpleUserData implements UserData
                             boolean frozen = result.getBoolean("frozen");
                             boolean canInteract = result.getBoolean("canInteract");
                             boolean caged = result.getBoolean("caged");
-                            return new SimpleUserData(u, username, user, group, playtime, frozen, canInteract, caged);
+                            long balance = result.getLong("balance");
+                            return new SimpleUserData(u, username, user, group, playtime, frozen, canInteract, caged, balance);
                         }
                     } catch (SQLException ex)
                     {
@@ -197,4 +201,28 @@ public class SimpleUserData implements UserData
     {
         this.caged = caged;
     }
+
+    @Override
+    public long getBalance()
+    {
+        return balance;
+    }
+
+    @Override
+    public void addToBalance(long amount)
+    {
+        this.balance += amount;
+    }
+
+    @Override
+    public void removeFromBalance(long amount)
+    {
+        this.balance -= amount;
+    }
+
+    @Override
+    public void setBalance(long newBalance)
+    {
+        this.balance = newBalance;
+    }
 }

Patchwork/src/main/java/me/totalfreedom/economy/EconomicEntity.java

@@ -0,0 +1,8 @@
+package me.totalfreedom.economy;
+
+public interface EconomicEntity
+{
+    EconomicEntityData getEconomicData();
+
+    String getName();
+}

Patchwork/src/main/java/me/totalfreedom/economy/EconomicEntityData.java

@@ -0,0 +1,12 @@
+package me.totalfreedom.economy;
+
+public interface EconomicEntityData
+{
+    long getBalance();
+
+    void addToBalance(final long amount);
+
+    void removeFromBalance(final long amount);
+
+    void setBalance(final long newBalance);
+}

Patchwork/src/main/java/me/totalfreedom/user/User.java

@@ -1,10 +1,25 @@
 package me.totalfreedom.user;
 
+import me.totalfreedom.economy.EconomicEntity;
+import me.totalfreedom.economy.EconomicEntityData;
 import me.totalfreedom.security.PermissionHolder;
 import net.kyori.adventure.text.Component;
 
-public interface User extends PermissionHolder
+public interface User extends PermissionHolder, EconomicEntity
 {
+    // Implement a few EconomicEntity methods in the User interface
+    @Override
+    default String getName()
+    {
+        return getUserData().getUsername();
+    }
+
+    @Override
+    default EconomicEntityData getEconomicData()
+    {
+        return getUserData();
+    }
+
     UserData getUserData();
 
     Component getDisplayName();

Patchwork/src/main/java/me/totalfreedom/user/UserData.java

@@ -1,12 +1,13 @@
 package me.totalfreedom.user;
 
+import me.totalfreedom.economy.EconomicEntityData;
 import me.totalfreedom.security.Group;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.UUID;
 
-public interface UserData
+public interface UserData extends EconomicEntityData
 {
     @NotNull UUID getUniqueId();