Retain trusted / helpers / denied when merging

fixes #533

src/main/java/com/intellectualcrafters/plot/object/Plot.java

@@ -25,8 +25,10 @@ import java.net.URL;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map.Entry;
+import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.UUID;
 
@@ -418,6 +420,66 @@ public class Plot {
         }
     }
     
+    /**
+     * Set the trusted users for this plot
+     * @param uuids
+     */
+    public void setTrusted(Set<UUID> uuids) {
+        if (uuids.size() == 0) {
+            return;
+        }
+        if (trusted != null && trusted.size() > 0) {
+            trusted.removeAll(uuids);
+            for (UUID uuid : trusted) {
+                DBFunc.removeTrusted(this, uuid);
+            }
+            trusted.clear();
+        }
+        for (UUID uuid : uuids) {
+            addTrusted(uuid);
+        }
+    }
+    
+    /**
+     * Set the members for this plot
+     * @param uuids
+     */
+    public void setMembers(Set<UUID> uuids) {
+        if (uuids.size() == 0) {
+            return;
+        }
+        if (members != null && members.size() > 0) {
+            members.removeAll(uuids);
+            for (UUID uuid : members) {
+                DBFunc.removeMember(this, uuid);
+            }
+            members.clear();
+        }
+        for (UUID uuid : uuids) {
+            addMember(uuid);
+        }
+    }
+    
+    /**
+     * Set the denied users for this plot
+     * @param uuids
+     */
+    public void setDenied(Set<UUID> uuids) {
+        if (uuids.size() == 0) {
+            return;
+        }
+        if (denied != null && denied.size() > 0) {
+            denied.removeAll(uuids);
+            for (UUID uuid : denied) {
+                DBFunc.removeDenied(this, uuid);
+            }
+            denied.clear();
+        }
+        for (UUID uuid : uuids) {
+            addDenied(uuid);
+        }
+    }
+    
     /**
      * Clear a plot
      * @see MainUtil#clear(Plot, boolean, Runnable)

src/main/java/com/intellectualcrafters/plot/util/MainUtil.java

@@ -23,6 +23,7 @@ package com.intellectualcrafters.plot.util;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -646,22 +647,35 @@ public class MainUtil {
             return false;
         }
         
+        HashSet<UUID> trusted = new HashSet<UUID>();
+        HashSet<UUID> members = new HashSet<UUID>();
+        HashSet<UUID> denied = new HashSet<UUID>();
+
         manager.startPlotMerge(plotworld, plotIds);
         for (int x = pos1.x; x <= pos2.x; x++) {
             for (int y = pos1.y; y <= pos2.y; y++) {
                 final PlotId id = new PlotId(x, y);
                 final Plot plot = PS.get().getPlot(world, id);
+                trusted.addAll(plot.getTrusted());
+                members.addAll(plot.getMembers());
+                denied.addAll(plot.getDenied());
                 if (removeRoads) {
                     removeSign(plot);
                 }
             }
         }
+        members.removeAll(trusted);
+        denied.removeAll(trusted);
+        denied.removeAll(members);
         for (int x = pos1.x; x <= pos2.x; x++) {
             for (int y = pos1.y; y <= pos2.y; y++) {
                 final boolean lx = x < pos2.x;
                 final boolean ly = y < pos2.y;
                 final PlotId id = new PlotId(x, y);
                 final Plot plot = PS.get().getPlot(world, id);
+                plot.setTrusted(trusted);
+                plot.setMembers(members);
+                plot.setDenied(denied);
                 Plot plot2 = null;
                 if (lx) {
                     if (ly) {