add formatting function to economy hook

src/main/java/com/songoda/core/hooks/EconomyManager.java

@@ -52,6 +52,15 @@ public class EconomyManager {
         return manager.getName();
     }
 
+    /**
+     * Format the given amount to a human-readable string in this currency
+     * @param amt amount to display
+     * @return a currency string as formatted by the economy plugin
+     */
+    public static String formatEconomy(double amt) {
+        return manager.isEnabled() ? manager.getCurrentHook().formatEconomy(amt) : String.valueOf(amt);
+    }
+
     /**
      * Check to see if a player has at least some balance available. <br />
      * NOTE: using a default economy assumes that this library is shaded

src/main/java/com/songoda/core/hooks/economies/Economy.java

@@ -1,9 +1,10 @@
 package com.songoda.core.hooks.economies;
 
 import com.songoda.core.hooks.Hook;
+import java.text.DecimalFormat;
 import org.bukkit.OfflinePlayer;
 
-public interface Economy extends Hook {
+public abstract class Economy implements Hook {
 
     /**
      * Check to see if a player has at least some balance available
@@ -12,7 +13,7 @@ public interface Economy extends Hook {
      * @param cost minimum amount this player should have
      * @return true if this player can have this amount withdrawn
      */
-    boolean hasBalance(OfflinePlayer player, double cost);
+    public abstract boolean hasBalance(OfflinePlayer player, double cost);
 
     /**
      * Try to withdraw an amount from a player's balance
@@ -21,7 +22,7 @@ public interface Economy extends Hook {
      * @param cost amount to remove from this player
      * @return true if the total amount was withdrawn successfully
      */
-    boolean withdrawBalance(OfflinePlayer player, double cost);
+    public abstract boolean withdrawBalance(OfflinePlayer player, double cost);
 
     /**
      * Try to add an amount to a player's balance
@@ -30,5 +31,15 @@ public interface Economy extends Hook {
      * @param amount amount to add to this player
      * @return true if the total amount was added successfully
      */
-    boolean deposit(OfflinePlayer player, double amount);
+    public abstract boolean deposit(OfflinePlayer player, double amount);
+
+    /**
+     * Format the given amount to a human-readable string in this currency
+     * @param amt amount to display
+     * @return a currency string as formatted by the economy plugin
+     */
+    public String formatEconomy(double amt) {
+        DecimalFormat formatter = new DecimalFormat(amt == Math.ceil(amt) ? "#,###" : "#,###.00");
+        return "$" + formatter.format(amt);
+    }
 }

src/main/java/com/songoda/core/hooks/economies/PlayerPointsEconomy.java

@@ -4,7 +4,7 @@ import org.black_ixx.playerpoints.PlayerPoints;
 import org.bukkit.Bukkit;
 import org.bukkit.OfflinePlayer;
 
-public class PlayerPointsEconomy implements Economy {
+public class PlayerPointsEconomy extends Economy {
 
     private final PlayerPoints playerPoints;
 

src/main/java/com/songoda/core/hooks/economies/ReserveEconomy.java

@@ -6,7 +6,7 @@ import org.bukkit.OfflinePlayer;
 
 import java.math.BigDecimal;
 
-public class ReserveEconomy implements Economy {
+public class ReserveEconomy extends Economy {
 
     EconomyAPI economyAPI;
 
@@ -25,6 +25,11 @@ public class ReserveEconomy implements Economy {
         return "Reserve";
     }
 
+    @Override
+    public String formatEconomy(double amt) {
+        return economyAPI.format(BigDecimal.valueOf(amt));
+    }
+
     @Override
     public boolean hasBalance(OfflinePlayer player, double cost) {
         return economyAPI.hasHoldings(player.getUniqueId(), new BigDecimal(cost));

src/main/java/com/songoda/core/hooks/economies/VaultEconomy.java

@@ -4,7 +4,7 @@ import org.bukkit.Bukkit;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.plugin.RegisteredServiceProvider;
 
-public class VaultEconomy implements Economy {
+public class VaultEconomy extends Economy {
 
     private final net.milkbowl.vault.economy.Economy vault;
 
@@ -29,6 +29,11 @@ public class VaultEconomy implements Economy {
         return "Vault";
     }
 
+    @Override 
+    public String formatEconomy(double amt) {
+        return vault != null ? vault.format(amt) : super.formatEconomy(amt);
+    }
+
     @Override
     public boolean hasBalance(OfflinePlayer player, double cost) {
         return vault != null && vault.has(player, cost);