Check if target has claimblocks required when transfering claims

.gitattributes

@@ -0,0 +1,2 @@
+# Ignore all differences in line endings
+*        -crlf

src/main/java/me/ryanhamshire/GriefPrevention/DataStore.java

@@ -390,6 +390,16 @@ public abstract class DataStore
         }
     }
 
+    public class NoClaimblocksTransferException extends RuntimeException
+    {
+        private static final long serialVersionUID = 1L;
+
+        NoClaimblocksTransferException(String message)
+        {
+            super(message);
+        }
+    }
+
     synchronized public void changeClaimOwner(Claim claim, UUID newOwnerID)
     {
         //if it's a subdivision, throw an exception
@@ -402,11 +412,19 @@ public abstract class DataStore
 
         //determine current claim owner
         PlayerData ownerData = null;
+
+        //determine new owner
+        PlayerData newOwnerData = null;
         if (!claim.isAdminClaim())
         {
             ownerData = this.getPlayerData(claim.ownerID);
         }
 
+        if (newOwnerID != null) {
+            newOwnerData = this.getPlayerData(newOwnerID);
+            if (!(newOwnerData.getRemainingClaimBlocks() >= claim.getArea()))
+                throw new NoClaimblocksTransferException("Target does not have the claimblocks to claim this area.");
+        }
         //call event
         ClaimTransferEvent event = new ClaimTransferEvent(claim, newOwnerID);
         Bukkit.getPluginManager().callEvent(event);
@@ -414,9 +432,6 @@ public abstract class DataStore
         //return if event is cancelled
         if (event.isCancelled()) return;
 
-        //determine new owner
-        PlayerData newOwnerData = null;
-
         if (event.getNewOwner() != null)
         {
             newOwnerData = this.getPlayerData(event.getNewOwner());

src/main/java/me/ryanhamshire/GriefPrevention/GriefPrevention.java

@@ -1294,6 +1294,11 @@ public class GriefPrevention extends JavaPlugin
                 GriefPrevention.sendMessage(player, TextMode.Instr, Messages.TransferTopLevel);
                 return true;
             }
+            catch (DataStore.NoClaimblocksTransferException e)
+            {
+                player.sendMiniMessage("<red>target does have the claimblocks to claim this area.", null);
+                return true;
+            }
 
             //confirm
             GriefPrevention.sendMessage(player, TextMode.Success, Messages.TransferSuccess);