Fix piston checks in subclaims (#1056)

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

@@ -534,7 +534,7 @@ public class BlockEventHandler implements Listener
         {
             Block invadedBlock = pistonBlock.getRelative(direction);
             Claim invadedClaim = this.dataStore.getClaimAt(invadedBlock.getLocation(), false, pistonClaim);
-            if (invadedClaim != null && (pistonClaim == null || !Objects.equals(pistonClaim.ownerID, invadedClaim.ownerID)))
+            if (invadedClaim != null && (pistonClaim == null || !Objects.equals(pistonClaim.getOwnerID(), invadedClaim.getOwnerID())))
             {
                 event.setCancelled(true);
             }
@@ -619,7 +619,7 @@ public class BlockEventHandler implements Listener
                     continue;
 
                 // If owners are different, cancel.
-                if (pistonClaim == null || !Objects.equals(pistonClaim.ownerID, claim.ownerID))
+                if (pistonClaim == null || !Objects.equals(pistonClaim.getOwnerID(), claim.getOwnerID()))
                 {
                     event.setCancelled(true);
                     return;
@@ -666,7 +666,7 @@ public class BlockEventHandler implements Listener
             lastClaim = claim;
 
             // If pushing this block will change ownership, cancel the event and take away the piston (for performance reasons).
-            if (pistonClaim == null || !Objects.equals(pistonClaim.ownerID, claim.ownerID))
+            if (pistonClaim == null || !Objects.equals(pistonClaim.getOwnerID(), claim.getOwnerID()))
             {
                 event.setCancelled(true);
                 if (GriefPrevention.instance.config_pistonExplosionSound)

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

@@ -711,6 +711,15 @@ public class Claim
         return GriefPrevention.lookupPlayerName(this.ownerID);
     }
 
+    public UUID getOwnerID()
+    {
+        if (this.parent != null)
+        {
+            return this.parent.ownerID;
+        }
+        return this.ownerID;
+    }
+
     //whether or not a location is in a claim
     //ignoreHeight = true means location UNDER the claim will return TRUE
     //excludeSubdivisions = true means that locations inside subdivisions of the claim will return FALSE