Add CurrencyDropCallback in order to allow for modify currency drops.

Core/src/net/tnemc/core/api/callback/TNECallbacks.java

@@ -33,6 +33,7 @@ public enum TNECallbacks {
   ACCOUNT_DELETE("account_delete"),
   TRANSACTION_PRE("transaction_pre"),
   TRANSACTION_POST("transaction_post"),
+  CURRENCY_DROP("currency_drop"),
   CURRENCY_LOAD("currency_load"),
   DENOMINATION_LOAD("denomination_load");
 

Core/src/net/tnemc/core/api/callback/currency/CurrencyDropCallback.java

@@ -0,0 +1,71 @@
+package net.tnemc.core.api.callback.currency;
+/*
+ * The New Economy
+ * Copyright (C) 2022 - 2024 Daniel "creatorfromhell" Vidmar
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import net.tnemc.core.currency.Currency;
+import net.tnemc.item.AbstractItemStack;
+import net.tnemc.plugincore.core.api.callback.Callback;
+
+import java.util.Collection;
+import java.util.UUID;
+
+/**
+ * CurrencyDropCallback
+ *
+ * @author creatorfromhell
+ * @since 0.1.2.0
+ */
+public class CurrencyDropCallback implements Callback {
+
+  private final UUID player;
+  private Currency currency;
+
+  private final Collection<AbstractItemStack<Object>> drops;
+
+  public CurrencyDropCallback(UUID player, Currency currency, Collection<AbstractItemStack<Object>> drops) {
+    this.player = player;
+    this.currency = currency;
+    this.drops = drops;
+  }
+
+  /**
+   * The name of this callback.
+   *
+   * @return The name of this callback.
+   */
+  @Override
+  public String name() {
+    return "currency_drop";
+  }
+
+  public Collection<AbstractItemStack<Object>> getDrops() {
+    return drops;
+  }
+
+  public Currency getCurrency() {
+    return currency;
+  }
+
+  public UUID getPlayer() {
+    return player;
+  }
+
+  public void setCurrency(Currency currency) {
+    this.currency = currency;
+  }
+}

Core/src/net/tnemc/core/currency/calculations/CalculationData.java

@@ -19,6 +19,8 @@
  */
 
 import net.tnemc.core.TNECore;
+import net.tnemc.core.api.callback.currency.CurrencyDropCallback;
+import net.tnemc.core.api.callback.currency.CurrencyLoadCallback;
 import net.tnemc.core.currency.Denomination;
 import net.tnemc.core.currency.item.ItemCurrency;
 import net.tnemc.core.currency.item.ItemDenomination;
@@ -117,10 +119,18 @@ public void provideMaterials(final Denomination denomination, Integer amount) {
     final Collection<AbstractItemStack<Object>> left = PluginCore.server().calculations().giveItems(Collections.singletonList((AbstractItemStack<Object>)stack), inventory);
 
     if(left.size() > 0) {
-      contains = contains - left.stream().findFirst().get().amount();
-      failedDrop = PluginCore.server().calculations().drop(left, player);
 
-      dropped = true;
+      final CurrencyDropCallback currencyDrop = new CurrencyDropCallback(player, currency, left);
+      if(PluginCore.callbacks().call(currencyDrop)) {
+        PluginCore.log().error("Cancelled currency drop through callback.", DebugLevel.OFF);
+
+      } else {
+
+        contains = contains - left.stream().findFirst().get().amount();
+        failedDrop = PluginCore.server().calculations().drop(left, player);
+
+        dropped = true;
+      }
     }
 
     PluginCore.log().debug("Weight: " + denomination.weight() + " - Amount: " + amount, DebugLevel.DETAILED);

Core/src/net/tnemc/core/currency/calculations/ItemCalculations.java

@@ -42,7 +42,7 @@ public BigDecimal calculateHoldings(CalculationData<I> data) {
       final int amount = data.getInventoryMaterials().getOrDefault(entry.getKey(), 0);
 
       if(amount > 0) {
-        holdings = holdings.add(entry.getKey().multiply(new BigDecimal("" + amount)));
+        holdings = holdings.add(entry.getKey().multiply(new BigDecimal(amount)));
       }
     }
     return holdings;

TestCore/.gitignore

@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store