Added IdentityEconomy#supportsUUIDOperations

src/main/java/net/milkbowl/vault/economy/IdentityEconomy.java

@@ -64,6 +64,15 @@ public interface IdentityEconomy extends Economy{
      */
     public boolean supportsOfflineOperations();
 
+    /**
+     * Used to determine if IdentityEconomy was built through
+     * the EconomyWrapper as a LegacyEconomy.
+     * If false, you should expect UnsupportedOperationException
+     * being thrown when calling these methods.
+     * @return true if operation is supported
+     */
+    public boolean supportsUUIDOperations();
+
     /*
      * Account-related methods follow.
      */

src/main/java/net/milkbowl/vault/economy/LegacyEconomy.java

@@ -28,6 +28,11 @@ public class LegacyEconomy implements IdentityEconomy {
         return false;
     }
 
+    @Override
+    public boolean supportsUUIDOperations(){
+        return false;
+    }
+
     @Override
     public boolean isEnabled() {
         return economy.isEnabled();