From 48601e4215a53f915260d589b8dae04be8c1e87f Mon Sep 17 00:00:00 2001
From: benwoo1110 <30431861+benwoo1110@users.noreply.github.com>
Date: Fri, 27 Nov 2020 21:14:27 +0800
Subject: [PATCH] Fix cannot remove block currency with mvm set command.

Setting currency to 0 is now considered as no currency value.
---
 .../onarandombox/MultiverseCore/configuration/EntryFee.java  | 5 +++++
 .../onarandombox/MultiverseCore/TestEntryFeeConversion.java  | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/src/main/java/com/onarandombox/MultiverseCore/configuration/EntryFee.java b/src/main/java/com/onarandombox/MultiverseCore/configuration/EntryFee.java
index be66fb3a..3fff6fe3 100644
--- a/src/main/java/com/onarandombox/MultiverseCore/configuration/EntryFee.java
+++ b/src/main/java/com/onarandombox/MultiverseCore/configuration/EntryFee.java
@@ -22,6 +22,8 @@ public class EntryFee extends SerializationConfig {
     @Nullable
     private Material currency;
 
+    private final Material DISABLED_MATERIAL = Material.AIR;
+
     public EntryFee() {
         super();
     }
@@ -51,6 +53,9 @@ public class EntryFee extends SerializationConfig {
      */
     @Nullable
     public Material getCurrency() {
+        if (currency == null || currency.equals(DISABLED_MATERIAL)) {
+            return null;
+        }
         return currency;
     }
 
diff --git a/src/test/java/com/onarandombox/MultiverseCore/TestEntryFeeConversion.java b/src/test/java/com/onarandombox/MultiverseCore/TestEntryFeeConversion.java
index 05b94d33..110e9dd3 100644
--- a/src/test/java/com/onarandombox/MultiverseCore/TestEntryFeeConversion.java
+++ b/src/test/java/com/onarandombox/MultiverseCore/TestEntryFeeConversion.java
@@ -50,6 +50,10 @@ public class TestEntryFeeConversion {
         WorldProperties props = new WorldProperties(config);
         assertNull(props.entryfee.getCurrency());
 
+        entryFee.put("currency", 0);
+        props = new WorldProperties(config);
+        assertNull(props.entryfee.getCurrency());
+
         entryFee.put("currency", 1);
         props = new WorldProperties(config);
         assertEquals(Material.STONE, props.entryfee.getCurrency());